Category: Food Security

CONNECTED – a new network to tackle vector-borne crop disease in Africa

Posted on by janet.crompton

 

Last week I was immersed in the world of African crop diseases, specifically the vector-borne kind, as part of the launch of CONNECTED. For those, like me, who aren’t an expert in the field – vector-borne diseases are those which are carried around by an organism (like a fly or insect) from one plant to the next.

This major new network brings together UK scientists with colleagues from across Africa to co-produce innovative new solutions to vector-borne crop diseases. And it turns out, there are a lot of them.

Africa has over 100 years of history with plant viral diseases. In 1894 cassava mosaic disease hit, followed by maize streak virus in 1901, and cassava brown streak in 1936.  Each had caused devastation, and in many cases, death.

Standing in the room and listening to presentations led by our African colleagues, there was a clear desire to work together – across disciplines and continents – to make a significant and lasting impact on crop disease reduction in Africa.

In this blog, I share just a handful of the things I learnt, alongside my thoughts for CONNECTED’s role in innovating for the future.

What are the challenges?

Almost every major crop in Africa is affected by disease

Yams, cassava, boy bean, cocoa, maize, coffee, bananas and many more of Africa’s key crops are affected by vector-borne disease.

That creates an ENORMOUS burden for the continent. Estimates shared by Prof Emmanuel Okogbenin suggest that yield losses due to plant disease cost $30 billion annually. In addition, it seriously affects food security and malnutrition in a continent where around 160 million of its population are already deemed food insecure.

As a result, demand is outstripping production for many crops (like maize), and Africa is heavily reliant on imported goods. These are undoubtedly more expensive than locally grown produce, and remain inaccessible or affordable to many.

Crucially, people have died as a result of every major outbreak.

When disease hits, it can cause severe losses

Sweet potato virus disease (SPVD) can lead to a 70-100% yield loss in infected plants.  The level of loss greatly exacerbates the issues described above.

So which crops are the most important ones to protect?

Well, it depends how you ask the question. 500 million people depend on cassava as a staple crop, and 158 million tons are produced in Africa by smallholders.

By contrast, 54 million tonnes of yam is produced annually, but 95% of this is produced in what is known as the ‘yam belt’, meaning it is considered critical in those regions. It also draws a value of c. $13.5M.

But it was clear from discussions today that we need to move beyond this idea of protecting a single crop. It turns out to be a lot more complicated than that.

In many cases, it’s not a simple case of a single vector and a single virus causing a single disease

Disease spread is highly complex. A single vector can carry many types of virus, and many viruses can be transmitted by multiple vectors. Additionally, some viruses affect a number of crops. This means it’s extremely difficult to know which vector/ virus to focus on tackling, or which crop to focus on treating, if you want to make a difference.

Perhaps surprisingly, some diseases only appear to ‘present’ when multiple viruses affect the same plant. In fact, around 69% of diseases in yams appear to be caused by 2 or more viral infections occurring at the same time.

To top it off, the vectors can often live on a number of different host plant species. This means that even if you create a crop that is resistant to a particular virus, it may still be present and spread between other plants.

And there are lots of vectors, spreading lots of diseases

Today I heard about so many vectors and viruses it’s impossible to name them all. However, here are just a few key examples that were covered by experts in the room:

  • Vectors: white fly, Aphids, leafhoppers, plant hoppers, mealybugs (my favourite, based purely on the name), thrips, and beetles.
  • Viruses: cassava brown streak virus, cassava mosaic virus, banana bunchy top virus, maize chlorotic mottle virus, yam mosaic virus, badnaviruses (yam, banana and coco), and legume potyviruses

Much disease is also spread by infected seed

In the case of sugarcane mosaic virus (SCMV), a large proportion of transmission is down to aphids, but an even greater proportion stems from the sharing of infected seeds. In a Q&A session on this topic, one audience member asked, ‘what’s the main barrier stopping people from using uncertified seeds?’ The answer? Cost. At present, many people buy seeds from friends, by the roadside, at local markets, or store their own supplies from year to year. These practices carry risk and whilst ‘certified’ (virus free) seeds are available, these are expensive. It was an important reminder that often, the scientific solutions are available, but there are social, political and economic factors to consider in ensuring uptake of these advances.

Over 80% of agricultural production in Sub-Saharan Africa is done by small holders

Whilst this has many benefits (people effectively have ‘control’ of their food production systems), managing disease across such a vast number of smallholder farms represents a major challenge. First and foremost – it’s difficult to engage with such a large number of individual farms to coordinate disease management strategies. Critically, it’s also difficult for smallholders to coordinate responses amongst themselves. In this context, ‘CONNECTED’ seems an entirely appropriate name for an initiative tackling this problem.

Summing up

In summary, day 2 of the CONNECTED conference helped us to share experiences, identify key challenges and research gaps, and decide where, as a network, we should best deploy our resources.

There was also a real sense that CONNECTED could bring far more than collaborative & impact-led research (though this in its own right would be exciting!). There were calls for joint databases, support with equipment purchases, training and capacity building, on-the-ground diagnostic support, e-resources, new technology development, incentivising public-private partnerships, and much, much more.

Through this network, there is great potential to forge important international collaborations and pool resources for maximum impact.

All in all, it has been incredible to see what expertise exists in both the UK and in Africa, hear about the collective ambitions of these fantastic collaborators, and begin to chart a path for CONNECTED.

I for one, am left feeling hopeful, inspired, and of course, ‘connected’.

The CONNECTED project

Our mission

Determined to fight malnutrition, poverty and food insecurity in Sub-Saharan Africa, the CONNECTED project is building a network of researchers to tackle vector-borne* plant diseases that devastate lives.

The challenges we face …

  • Established plant diseases carried by vectors* significantly limit the ability of Sub-Saharan Africa to produce sufficient staple and cash crops.
  • Limited production causes poverty, malnutrition and food insecurity, which in turn prevent economic and social development.
  • A range of new factors are set to compound the situation and raise the threat still further:
    • The emergence of new virus diseases
    • Climate change
    • A growing population
    • Resource limitations.

The solutions we are developing …

  • The CONNECTED** project is bringing together a network of world-class researchers to find and develop practical solutions to control plant disease.
  • We are pump-priming a range of innovative and potentially-transformative research activities, whose impact will be thoroughly evaluated. These research activities focus on five key areas:
    • Control strategies
    • Vector biology
    • New diseases
    • Vector / virus interactions
    • Diagnostics / surveillance / forecasting.
  • We are also providing training and capacity-building opportunities in the region during the three-year project lifespan.

And in the longer-term …

The aim is that the projects with the greatest regional impact can subsequently be grown into larger scale activities to achieve still greater bearing on the battle to control plant disease in Sub-Saharan Africa.

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This blog is written by Hayley Shaw who is the Manager of the Cabot Institute, and is a Network Advisor to the CONNECTED Network.

Notes
*A vector is a biting insect or tick that transmits a disease or parasite from one plant to another.

Putting algae and seaweed on the menu could help save our seafood

Posted on by janet.crompton
File 20171213 27593 sfv3nk.jpg?ixlib=rb 1.1
Shutterstock
This article was written by Pallavi Anand, The Open University and Daniela Schmidt, University of Bristol Cabot Institute. 


If we have to feed 9.8 billion people by 2050, food from the ocean will have to play a major role. Ending hunger and malnutrition while meeting the demand for more meat and fish as the world grows richer will require 60% more food by the middle of the century.But around 90% of the world’s fish stocks are already seriously depleted. Pollution and increasing levels of carbon dioxide (CO₂) in the atmosphere, which is making the oceans warmer and more acidic, are also a significant threat to marine life.There is potential to increase ocean food production but, under these conditions, eating more of the species at the top of the food chain, such as tuna and salmon, is just not sustainable. As a recent EU report highlighted, we should instead be looking at how we can harvest more smaller fish and shellfish, but also species that aren’t as widely eaten such as seaweed and other algae.The oceans have absorbed around one third of the CO₂ emitted into the atmosphere since the Industrial Revolution. The absorbed CO₂ goes through a series of chemical reactions that form carbonic acid and lower the pH of the water. These reactions also reduce the concentration of carbonate ions, which are vital for those creatures that grow external skeletons such as corals and shellfish.

The acid and the lack of carbonate mean these organisms form weaker skeletons and have to use more energy to do so, leaving less energy for growth and reproduction. Consequently, they up smaller in size. Aside from the impact this has on shellfish, several of the species affected, such as corals in the tropics or coralline algae in the waters around the UK, also play a key role in providing food and nursing grounds for fish. And less fish food leads to fewer fish for us to catch.

Climate change is affecting food production

The impact of ocean acidification varies widely across the globe. But it is already affecting marine food production, particularly of shellfish. For example, CO₂-rich water along the west coast of the US means more oysters in local hatcheries are dying when they are still larvae.
Warmer seas due to climate change are also affecting food supplies. Some species are moving towards the poles in search of cooler water, forcing fishermen into more northerly waters or leaving them without stocks altogether. Some fishing fleets in northern locations will find more fish available but many will see the amount of fish available to catch fall by between 6% and 30% depending on the region. The biggest impact will be on areas that are already the most dependent on fishing, such as Southeast Asia and West Africa.

One possible solution is to eat more smaller fish and shellfish such as mussels. Large fish need to eat smaller fish to grow. If we eat smaller fish instead then we remove a step from the food chain and reduce the amount of energy lost in the process. What’s more, it might become easier to farm these smaller fish because the algae, cyanobacteria and other plankton they eat could actually benefit from warmer waters and higher levels of CO₂ in the atmosphere. This is because they get their energy from photosynthesis and so use CO₂ like fuel.

Spirulina, the new seafood cocktail.
Shutterstock

It might also be possible to take this a step further and add some of these organisms directly to our diet, giving us an abundant new source of food. Seaweed, for example, is a type of algae that has been eaten for centuries, but only 35 countries commercially harvest it today. Spirulina cyanobacteria is already eaten as a food supplement and several companies are trying to turn other forms of algae into a human food source.

Farming these organisms in the right way could even help counter some of the effects of climate change on the rest of the food chain. For example, growing more seaweed lowers the amount of CO2 in the surrounding water, reduces acidification, and improves the environment for oysters and other shellfish. Managing seaweed harvest correctly will also maintain the dissolved oxygen and nutrient levels in the water, contributing to the overall health of the ocean.

The ConversationMaking algae a common part of more people’s diets won’t be easy. We need to ensure that any new algae food products on our dinner plates have the needed nutritional value but are also attractive and safe to eat. But sticking with our traditional salmon and tuna diet isn’t sustainable. Expanding our seafood menus could be a vital way of keeping the ocean healthy while it supplies the food we need.
Pallavi Anand, Lecturer in Ocean Biogeochemistry, The Open University and Daniela Schmidt, Professor in Palaebiology, University of Bristol

This article was originally published on The Conversation. Read the original article.

Olive oil production in Morocco: so many questions

Posted on by janet.crompton

No standard salad would be complete without olive oil. Our friends the lettuce, tomato and cucumber now come automatically accompanied by the vinegar and the oil, the oil and the vinegar. Perhaps in a bottle, perhaps in a sachet, perhaps in some kind of over complicated vinaigrette processed by a supermarket near you, along with lots of salt and some corn syrup, a 21st century salad in the Western world would be naked without an olive dressing.

This weekend, after an intensive academic seminar in Morocco[1], we studious seminar attendees were rewarded with a field trip. So I was taken out to visit three agricultural holdings in action. They all grew olives, but apart from that, had little in common. These three: large, medium and small producers in turn gave us a hugely insightful opportunity to witness agricultural change in action. Since the turn of the millennium the large site, on previously colonial, then state-held land had been an apple orchard and had now turned to olive oil. The medium one had been focused on cattle, making use of previous common land, that was now enclosed land, and was now diversifying with oil, watermelons, and more. The small producer produced a full range of things including olives for their own oil and most recently had established a side income in both fish and honey production.

Firstly, we learnt how to make money. Morocco’s heavily financed agricultural development programme, Plan Maroc Vert, which aims to intensify the agricultural system into a new-age competitive beacon of the modern food system, offers attractive incentives to spruce up agriculture in the country with new machines. All you need is to write a proposal (a report), have money to invest (from bank credit perhaps) and an impressive part of your money will be returned to you in state subsidies within two years.

So, for example, all three of the small, medium and large producers we visited, had benefited from a 100% state subsidy for irrigation of their crops. In the case of the ‘super-intensive’ large producer this meant state funding for the irrigation of 65,780[2] olive trees from groundwater on a rapidly declining water table. Some of the more landscape-savvy of the seminar group reminded us that olive trees had been grown in the region for centuries precisely because they did not need this kind of constant watering but could grow deep roots and access scarce water themselves. This, however, is not of interest to the ‘super-intensive’ producer. This producer is simply interested in the logic of economic growth, which in this case says: plant the trees closer, and add the chemical nutrients to the water while you’re at it. And so, these 65,780 trees are watered with the addition of nitrogen, phosphorus, potassium and ammonium, yet no studies are evident of what all these substances may be doing to the groundwater. By any other logic this would be a big concern, nitrogen pollution, particularly. Nitrogen pollution of water supplies, or more simply, of the nitrogen cycle, is one of the only planetary ecosystem boundaries that we have already crossed as a human race. This was not relevant in the lesson of how to make money.

Yet, I work with people, so where were they in the Moroccan olive grove? Well, it seems they have been replaced by a machine in this super-intensive oil production. The company, with links to power as far up as it goes, has invested in a machine that drives over the trees like a bridge. It shakes their branches and collects their olives.  So much for an investment in rural employment.

Some new olive trees defy the machine but are pretty un-reliable as employers too. These trees that the machine can’t manage provide jobs for only a very precarious seasonal and short-term workforce. I was told that 100 people would be employed for a space of around 200 hectares, and these jobs would last 2-3 months. The company assured us though that these workers would get both contracts and, in order to have those contracts, bank accounts. Thank goodness the banks aren’t losing out.

I should be kinder in tone about the small and medium sized farmers that we visited. Not only did their olive oil taste a lot richer, but they invited us to tea, and allowed us to share their experience of oil production more closely.  They humoured our partial language skills and our many, many questions. This was the second major thing we learnt on the trip – we were a team. We were a slightly chaotic, and erratic team, but really quite effective. A little like slugs on a cabbage, we chewed up every bit of information every which way.

Releasing a group of 13 researchers at a family farm, was a bit like inviting children to a playground, or providing clowns with an audience. Each of us found something to play with, interact with, reflect upon and smile. Some of us looked at the trees or identified the plant specimens. Others wrote notes, or took pictures, or carried out semi-formal interviews with whichever family member we felt most comfortable with. Others played with material toys, climbing ladders, smelling fruit or knocking on enormous oil containers to discover them empty. As we found the olive branches, force-fed powder food through irrigated pipes, or in the smaller farm providing shade for some resident chickens, this seminar group grew together, discovering the knowledge of the peasant farmer.  This experience was far richer and engaging than any power point presentation or report.

More images can be found on the original blog.

References

[1] “Workshop on Agricultural Labour and Rural Landscapes in the Arab World” Organised by the Thimar collective and supported by the École Nationale d’Agriculture de Meknès, the Leverhulme Trust and the London School of Economics.

[2] Calculated based on 286 plants/hectare in a cultivated area of 230 hectares, this was the details of the holding advertised by the company.

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This blog is written by Lydia Medland, a PhD student at the University of Bristol’s School of Sociology, Politics and International Studies who is looking at the role of seasonal workers in global food production, specifically in Morocco and Spain.  This blog has been reposted with kind permission from her Eating Research blog.  View the original blog post.

Lydia Medland

Read Lydia’s other blog: Watermelon work

What happens when you let PhD students and post-docs organise a meeting?

Posted on by janet.crompton

As plant science PhD students, we feel it is vital to share our research with other scientists to generate new ideas for collaborative projects. For this reason we decided to organise the ‘Innovations in Plant Science to Feed a Changing World’ workshop, which was held in the University of Bristol Biological Sciences department in February 2017. The delegates included early-career scientists from Kyoto University, Heidelberg University and of course the University of Bristol.

Figure 1. The Conference Poster

The University of Bristol has a long-standing partnership with Kyoto University and more recently, Heidelberg University, as our plant science groups share overlapping research areas. The main aim of the workshop was to encourage novel collaboration opportunities between the plant science groups, which would give rise to future projects, publications and ultimately funding.

Last year, Kyoto University hosted a highly engaging and productive workshop (see Sarah Jose’s blog post last year) for early-career scientists from the three universities in this coalition. Following from the success of this workshop, we decided to organise the second workshop, where participants could build upon the partnerships forged at the last meeting, form new links and present their results in a friendly environment. So, for the past six months, a team of PhD students and post-docs has been busy organising the meeting that took place in February.

As it turns out, organizing a three-day conference, even a relatively small one, is quite a lot of work. Getting venues, transfers, catering, accommodation and social activities booked all presented their own particular challenges. However, perhaps the most challenging task was designing the program for the workshop, which was set out into different themes to encompass the participants’ different subject areas.

All the organisation paid off when the visitors arrived, slightly (very) jet lagged from their long flights. Once the workshop had started, we were delighted with how smoothly the sessions ran and how engaging the talks were. Following the talks there were many discussions over coffee, during the poster session and break-out session. We also included a careers talk from Prof Tokitaka Oyama from Kyoto University, who shared his insights on how to succeed as a plant scientist. Another highlight was the keynote talk from Professor Keith Lindsey (University of Durham), who shared his fascinating work on modeling plant developmental biology.

In amongst all the science, we had time for an excursion to the University of Bristol Botanical Gardens where Nick Wray gave a fascinating tour, which was very enjoyable. We also visited the Wills memorial building tower and even had a go at ringing the bell!

Figure 2. Nick Wray (far right) led a fascinating tour of the University’s Botanic Garden for the visitors.

Although organising the workshop was a lot of work, it was definitely worth it. Our organisation, leadership and project management skills were trained and tested in the run-up to the workshop, but in the end, it went very well indeed. All the delegates thoroughly enjoyed their participation and a comment that was heard a few times was that delegates were impressed, not just with the quality of the science being presented, but also the quality of the scientific discussion particularly given that English was not the first language for the majority of the participants.

We hope that the links formed at the workshop will continue to develop into novel collaborative projects. – I (Donald) definitely benefited as the post-doc Massaki Okada even stayed on a few days to teach me some techniques.

We would like to thank our funders, the Bristol Centre for Agricultural Innovation and the New Phytologist Trust for their support. We’d also like to thank the other members of the organising committee whose hard work made this workshop so successful: Fiona Belbin, Deirdre McLachlan, Tsuyoshi Aoyama and Antony Dodd.

Figure 3. Group Photo

Blog post by Donald Fraser & Katie Tomlinson

After 2016; how to achieve more inclusive food policy?

Posted on by janet.crompton

Having spent my British Academy Postdoctoral Fellowship researching forms of governance that aspire to achieve that nebulous concept of ‘sustainability’ in relation to certain parts of the global agro-food/fuel system, it seemed fitting that the last event I attend in this capacity should be City University’s annual Food Symposium.  This year’s Symposium enabled Prof. Tim Lang, who is passing the baton of running City’s influential Food Centre to Prof. Corinna Hawkes, and a number of his colleagues, to reflect on the past 25 years of food policy. But it also provided an unprecedented opportunity to 40 audience members from both academia and civil society to imagine a more utopian future – not difficult in our troubled present – to table their vision of ‘How to do food policy better’. We heard from a headteacher, a producer, a proud ‘Colombian peasant’, a farmer’s daughter, a student, the BBC chef of the year, a former advertiser, a community food network coordinator.  We then went on to hear from a panel of those who have been working to enable such diverse voices to be heard both in relation to the research they have been undertaking or the programmes they have been endeavouring to implement.

While my own work has been predominantly focused on issues brought to the fore in international development, it is clear that inequalities and unequal vulnerabilities exist extensively in the global North, as well as the global South.  Although we as researchers recognise the need for a holistic and systemic approach to food and agriculture, this is rarely translated into more holistic food policy.  But we have seen that policies that do not adopt a systemic approach to food and agriculture may instead produce extensive social, cultural and environmental problems related to food and farming across the globe.

There are so many pressing reasons to change our diets, for our own health, and the health of the planet, but we carry on producing and selling food which is bad for us, and pursuing agricultural production on a scale that feeds such consumption.  While this may not be in the same vein as the productionism pursued in the 1970s and 1980s, agricultural production continues to be tenaciously coupled with carbon emissions. And knowledge alone is insufficient to change this food and agriculture system of mass consumption and supermarket driven value chains.

As we heard a number of times, we are not only going through a period of weak food policy, but the intensive agricultural regime is in crisis.  And there is a lack of progressive consensus as to what any kind of food project should be. Given that 40% of EU legislation relates to food and agriculture, this does not bode well for this soon-to-be-Brexiting-less-than-united-kingdom.

While we can indeed celebrate that the need for ‘sustainable consumption’ and ‘sustainable production’ is generally accepted, and that ‘food and nutrition’ is even on the public health agenda, we also have much to fight for.  For many at the Symposium, there was a palpable anger at the policies that have led to growing inequality and hunger in this country.  While there is an evidential link between low income, diet and poor health, there remains an ongoing rhetoric of ‘blame’ and ‘undeserving’. And low income must in turn be linked with other vulnerabilities, such as gender, infancy, maternity, citizenship status (or lack of it).  But as Prof. Liz Dowler aptly summarised, the circumstances in which people are having to live are being ignored by governments whose own policies have caused them to be in this predicament. So with a growing reliance on charity, such as food banks, people are deprived even of any sense of ‘entitlement’ and ‘rights’, even when it comes to food. Whether or not a human being goes hungry or malnourished should never be dependent on deserving, even on citizenship. And governments, rather than charities, must be held accountable.  Nevertheless, there is a fear that Brexit, and a rise in anti migrant feeling, is going to make inequalities harder.

A Symposium on food policy would be remiss, however, if it did not link government policies with a recognition that access to nutritious food is also determined by corporate power.  This needs to take in supermarkets, fast food chains, the catering sector.  And this is indeed where power lies. And that power does not only involve selling much of the wrong kinds of food to people, but also squeezing the power of farmers who, as many argued, need to be central in finding a solution to the crisis of carbon based food production.  Prof. Terry Marsden suggested the need to build alliances between producers and consumers and take out the power of the middle of the value chain. Although at the Symposium it was widely agreed that there needs to be greater inclusivity of those voices who are affected by, but rarely manage to influence, food policy, I would argue that this view is slightly myopic of the wider agrofood system.  This system is indeed driven by wider agri-industrial policies and corporate interests, but ones which have very little to do with food at all.  Such policies explain the EU Renewable Energy Directive mandating the production of biofuel from prime agricultural land.  And such policies are repeated and repeated in country after country, and drive down incentives that farmers might otherwise have to grow nutritious food – our horticulture sector, for instance, is hardly thriving.  So while an annual Symposium on Food Policy is hugely valuable, and indeed this was one of the best conferences I have ever been to (not least for its inclusion of diverse civil society voices amongst academics), I would argue that food policy cannot be considered without a systemic lens cast much more widely than just food.

Blog post by Dr Elizabeth Fortin, Senior Research Associate, School of Law, and PolicyBristol Coordinator

Working with the weather to manage parasites of livestock in changing climates

Posted on by janet.crompton
Parasites can be found in every environment on earth and infect a wide range of hosts – birds, fish, plants, insects, wild animals, domesticated animals and humans.  When parasites are discussed they often trigger an “ewww” reaction.  However, they have much more serious economic, food security and animal health and welfare impacts when they infect grazing livestock.  Grazing livestock contribute greatly to food security and this is not going to change any time soon.  Not only is the global population (and therefore food requirement) growing, there is an increasing demand for animal-based food products in developing regions and there is an essential role of animal products in marginal environments where crop production is infeasible.  Parasite control is therefore vital, but is not easy to achieve.

Many parasites have complex lifecycles which depend upon specific climatic conditions.  For instance, temperature and moisture determine development rates and survival.  Farmers could once use this to their advantage as the predictable, seasonal weather patterns led to predictable, seasonal patterns of parasites.  Reliable livestock husbandry practices therefore developed for parasite management.  However, in recent years there have been changes in climate and less predictable weather patterns.  Traditional management practices are often no longer effective as parasites are being found in unexpected regions and at unexpected times of year.  What’s more, whilst other organisms are being put under threat by climate change, parasites are successfully evolving and adapting to these changes in environment due to their short reproductive cycles.

Predicting the risk of infection to parasites involves multiple areas of expertise.  An in-depth knowledge of parasite characteristics is essential, and needs to be updated as they evolve.  Accurate forecasts for climate are also needed to help predict which regions may have an environment suitable for the parasite and changes to its seasonality.  An accurate forecast for weather (daily climatic conditions) is essential for certain parasites.  Combining historical data with forecasts, knowledge of the parasite’s requirements for development and farm characteristics (such as altitude and orientation) within complex models gives precise information on infection risk and helps farmers to be one step ahead of the parasites.  Technology is also aiding the rapid diagnosis of specific parasite infections to guide effective management practices.

Despite these advancements in parasite control, uptake of the technologies by farmers is often slow. The science behind parasites and the models developed are complicated and daunting.  Livestock farming is demanding, both economically and in terms of labour.  Therefore farmers need these complex technologies to be transformed into tools that are still effective, yet simple and easy to integrate into their current practices.  They need to feel confident in using the tools and understand the benefits that come with them – not the science.  These benefits include more efficient animals, both economically and environmentally, and improved animal health and welfare.

There is still much to learn about parasites. The rapid changes to the environment, the livestock industry and the parasites themselves means that this is an area of work that will be ongoing for the foreseeable future.  There is a huge need for collaboration between disciplines to not only develop the tools, but also to communicate their need and promote their use on farms.  This barrier to technology uptake could be a bigger hurdle for scientists than technology development itself.

 
This blog is written by Cabot Institute member Olivia Godber, a PhD student in the School of Biological Sciences at the University of Bristol.
 

Saying goodbye and reflecting on lessons from the field

Posted on by janet.crompton

Last week I said goodbye to the National Crops Resources Research Institute (NaCRRI) where I have spent the last three months learning about Cassava brown streak disease (CBSD). I’m currently in the second year of my PhD at the University of Bristol, where I’m researching how CBSD viruses cause symptoms, replicate and move inside plants.

Cassava is a staple food crop for approximately 300 million in Africa. However cassava production is seriously threatened by CBSD, which causes yellow patches (chlorosis) to form on leaves and areas of tubers to die (necrosis), rot and become inedible. CBSD outbreaks are currently impacting on the food security of millions of cassava farmers in east Africa and it appears to be spreading westward, threatening food security in many countries.

I decided that I wanted to experience the problem for myself, see the disease in the field, meet the farmers affected and understand the different solutions. I am so pleased that I decided to visit NaCRRI; a government institute, which carries out research to protect and improve production of key crops, including cassava. The focus is on involving farmers in this process so that the best possible varieties and practices are available to them. Communication between researchers and farmers is therefore vital, and it was this that I wanted to assist with.

When I arrived I was welcomed so warmly, and was immediately part of the team. The root crop team leader Dr. Titus Alicai came up with a whole series of activities to give me a real insight into CBSD. I was invited to the field sites across Uganda, where I got to see CBSD symptoms in the flesh! I assisted with the 5CP project, which is screening different cassava varieties from five East and Southern African countries for CBSD and Cassava mosaic disease (CMD) resistance across different agro-ecological zones. I helped to score plants for CBSD symptoms. The researchers thought I was bit strange, getting very excited and taking lots of photos.

Main insight: complex and dynamic CBSD situation

The main insight I’ve gained is that the situation is both complex and dynamic. Different cassava varieties respond differently to CBSD infection, some plants show strong symptoms on the leaves and nothing in tubers, and other varieties show the opposite. Symptoms also depend on environmental conditions, which are unpredictable.

The whiteflies which carry viruses are also complex, and are expanding into new areas and responding to changing environmental conditions. There are also different viral strains found across different areas, and viral populations are also continually adapting.

Learning about solutions

It has been fascinating to learn how NaCRRI is tackling the CBSD problem through screening different varieties in the 5CP project, breeding new varieties in the NEXTGEN project, providing clean planting material and developing GM cassava.

Saying goodbye to new friends: Dr. Titus Alicai (NaCRRI root crops team leader), Phillip Abidrabo (CBSD MSc student) and Dr. Esuma Williams (cassava breeder)

And there’s the human element…

In each of these projects, communication with local farmers is crucial. I’ve had the opportunity to meet farmers directly affected, some of whom have all but given up on growing cassava. I’ve learnt a lot about how NaCRRI is constantly engaging farmers and involving them in solutions to the CBSD problem.

Challenges

Communicating has not been easy for me, as there are over 40 local languages. I’ve really had to be adaptable and learn from those around me. For example, in the UK we like to email the person sat next to us, whereas in Uganda you really have to talk to people to hear about what’s going on. This is all part of the experience and something I’m hoping to bring back to the UK!

I’ve had some funny moments too, during harvesting the Ugandans couldn’t believe how weak I was. I couldn’t even cut one cassava open!

Real world reflections

I’m going to treasure my experiences at NaCRRI. The insights into CBSD are already helping me to plan experiments, with more real-world applications. I can now see how all the different elements of the disease (plant-virus-vector-environment-human) join up and interact, something you can’t learn from reading papers alone!

Working with the NaCRRI team has given me the desire and confidence to collaborate with an international team. I’ve formed some very strong connections with people here and hope to have discussions about CBSD with them throughout my PhD and beyond. This will help make our research more relevant to the current situation. Above all, I’ve learnt the importance of getting out of the lab to experience and learn from what is happening in the field.

 

Thank you!

I would like to thank: Dr. Titus Alicai for welcoming me into the NaCRRI team and providing me with so many valuable experiences; the whole of the NaCRRI team for their generosity; my supervisors: Prof. Gary Foster and Dr. Andy Bailey for supporting my trip and my funders: Biotechnology and Biosciences Research Council, the Cabot Institute (University of Bristol), the British Society for Plant Pathology and the Society for Experimental Biology for supporting my internship.

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This blog has been written by University of Bristol Cabot Institute member Katie Tomlinson from the School of Biological Sciences.  Katie’s area of research is to generate and exploit an improved understanding of cassava brown streak disease (CBSD) to ensure sustainable cassava production in Africa.  This blog has been reposted with kind permission from Katie’s blog Cassava Virus.

 

Katie Tomlinson

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Paying a visit to the Plant Doctor in Uganda

Posted on by janet.crompton

Two weeks ago I organised a visit to a plant clinic in the Mukono district of central Uganda. The plant clinics are run by district local government extension staff with support from CABI’s Plantwise programme and offer a place where farmers can bring crop samples to get advice on how to prevent and cure diseases.

Why does Uganda need plant clinics?

It’s estimated that smallholder farmers loose 30 – 40% of their produce to plant health problems before harvest, which threaten food security, income and livelihoods. Ugandan farmers suffer heavily from pests and diseases, including maize stalk borer, wheat rust, banana bacterial wilt, coffee wilt and cassava viral diseases. The situation is always changing, as outbreaks of disease emerge and persist across the country.

Getting access to information is a challenge in rural settings. Often smallholder farmers have very little contact with extension workers and have no way of diagnosing diseases or finding solutions. The plant clinics provide farmers with access to current information to help make rapid, informed decisions that will save their crops. There are now over 191 plant clinics across Uganda and the aim is to have at least one plant clinic in every sub-county by 2020.

On the day…

I was picked up by Benius Tukahirwa an Agricultural Inspector from the Ministry for Agriculture Animal Industry and Fisheries (MAAIF). We drove to Mukono to meet Mukasa Lydia, who’s been a plant doctor for eight years! She has a wealth of plant health knowledge and is in touch with the local community.

When we arrived, we set up a base in the heart of the smallholder village of Nakifuma, Kimenyedde Sub-county, Mukono district. Local farmers find out about the monthly plant clinics through radio announcements and word of mouth. Before long a set of five farmers had arrived with their sickly plant samples. I was told that normally the plant clinics have around 20-50 visitors in a day. On this day the turnout was low as the rains had just started so farmers were in the field planting.

Local famers gather round to hear advice from the plant doctors

Patient 1

The first patient to be examined was a passion fruit branch with “woodiness” viral disease, which causes fruit to become misshapen, woody and inedible. The farmer was told to remove and destroy the infected plants immediately to prevent spread to other plants.

Patient 2

The second patient was a coffee plant with coffee berry disease, a fungal disease which causes coffee berries to rot, turn black and mouldy. The farmer was advised to immediately remove and destroy infected branches, and to apply copper based fungicides to the remaining plants.

Patient 3

The third patient I was very familiar with. The farmer had brought a cassava branch with Cassava brown streak viral disease, the leaves showed characteristic yellow patches and tubers were spoiled and inedible. The plant doctors advised him to get hold of some clean, virus-free planting material from a tolerant variety such as NAROCASS 1, NASE 14, NASE 19 from the government.

Plant patients: passion fruit with woodiness disease (left), coffee wilt disease (middle) and cassava brown streak disease (right)

The farmer: Kayondo Edrissa told me:

“I have been growing cassava for 20 years. I was hard hit in the 90’s by Cassava mosaic disease (CMD), which totally destroyed cassava crops and caused widespread famine. Since the release of CMD resistant varieties people had begun relying on cassava again. But now these varieties have been overcome with Cassava brown streak disease. I’m not going to plant cassava until I get hold of a variety which can resist the disease. Cassava is the real food which can keep our houses going so we really need a solution.”

After the crops were diagnosed, the plant doctors gave clear instructions for how to prevent or cure the diseases in the local language. These instructions were also sent as text messages to the farmers’ phones. Information and images of the diseases were also uploaded to the Plantwise Knowledge Bank so the government can track and respond to outbreaks. There was a challenge in getting a strong enough internet signal to upload the reports.

We then took a tour of Kayondo’s small-holding where we discovered lots of other problems, including a cassava plant with: CBSD, CMD, bacterial wilt and green mites! I was surprised at how many different plant diseases the farmers are facing. The visit helped me to recognise the importance of the clinics; they offer a meeting point for farmers to learn and communicate with each other and trained extension works about similar problems they are facing.

I would like to thank Plantwise for allowing me to visit the clinic, I had a very informative day!

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This blog has been written by University of Bristol Cabot Institute member Katie Tomlinson from the School of Biological Sciences.  Katie’s area of research is to generate and exploit an improved understanding of cassava brown streak disease (CBSD) to ensure sustainable cassava production in Africa.  This blog has been reposted with kind permission from Katie’s blog Cassava Virus.

 

Katie Tomlinson

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Taking basic research to application: Using light quality to improve herb growth

Posted on by janet.crompton
Coriander has a distinctive flavour and is popular in dishes such as curry. (Image By Deeptimanta (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons)

Coriander is the UK’s top-selling culinary herb, an industry worth £18 million a year. However, maintaining high standards of product quality is expensive and can lead to lots of plants being rejected before they make it to supermarket shelves. One of the key objectives for the potted herb industry is the production of compact plants with dark green leaves, but the plants that consumers end up with often do not conform with this ideal and can appear leggy and weak.

Plants compete for light by growing taller

Plants go to extraordinary lengths to maximise their light capture for photosynthesis. When plants grow close together however, they compete for resources and one resource that becomes limited in closely spaced plants is light due to mutual shading.

Shade has a negative impact on a plant’s health as it limits the light that a plant can use for photosynthesis. But unlike animals, which can move to new areas once space, water or food becomes limited, plants are immotile and have evolved unique strategies to compete for and maximise light capture. Chief among these is the shade avoidance syndrome. Incredibly, plants anticipate that they are at risk of being shaded even before they actually are shaded through the detection of local light quality – the depletion of red and blue light and the relative enrichment of longer wavelengths of light due to the absorption and reflection properties of vegetation. The shade avoidance syndrome is triggered in response to this change in light quality and the most dramatic changes in plant form involve the elongation of stems and the raising of leaves so as to move light capturing organs into sunlight.

Elongation does have drawbacks however – resources are diverted away from seed, chlorophyll and leaf production; there is also an increased risk of lodging (where plants fall over due to over-elongation making them unable to support their organs), which puts a limit on how densely we can plant crops before they over-compete with each other and it impacts yields.

UV-B suppresses elongation

On the other hand, plants have mechanisms in place to prevent over-elongation. These are often related to light-quality as well and one such mechanism is the sensing of UV-B wavelengths.

Classical Ultra-Violet research on plants has focused on the damaging effects that this shorter wavelength, higher energy light can have on DNA, or cell structure through production of reactive oxygen species. These UV-B wavelengths are beyond our visible range, but plants have specific photoreceptors that can detect UV-B and trigger a signaling cascade that will lead to the accumulation of sun screening compounds as well as architectural changes. Indeed, it is now clear that the plant responses to UV-B are not only a reaction to UV-B damage, but also a specific response to the sensing of UV-B (read more on this on the UV4Plants society website).

A finding that emerged from our laboratory in Bristol was that the elongation that plants exhibited in crowded conditions could be suppressed with the addition of UV-B to their light conditions (Hayes et al., 2014). UV-B is a component of direct sunlight, so an interpretation of this adaptation is that plants use UV-B as a signal that they are in direct sunlight and hence no longer need to elongate to escape shade.

Applying our research to the glasshouse

Armed with this new knowledge of plant responses to light, we are collaborating with a major potted herb grower to improve their product quality. A problem with glasshouse grown coriander in the winter months is that they grow long and spindly. Often these herbs are planted densely with around 60 seedlings per pot – conditions that are conducive to shade avoidance. Short days and cloud cover during winter further contribute to over-elongation. To compound this, many materials used in glasshouse construction such as glass or clear acrylic filter out UV-B radiation. Thus, plants growing in these conditions are no longer receiving the UV-B brake on elongation that they would be if they were growing outdoors. If we restore this brake by using artificial UV-B light sources then we could solve this problem. We’ve started trialing UV-B treatments this summer and early results look promising. However, we need to wait until winter to collect our most informative data as in summer, with bright and long days, coriander plants grow far more compact than in winter.

Both pots were planted at the same density, the coriander on the left were grown in normal conditions while the coriander on the right were supplemented with UV-B radiation.

Hayes S, Velanis CN, Jenkins GI, Franklin KA. UV-B detected by the UVR8 photoreceptor antagonises auxin signalling and plant shade avoidance. Proc Natl Acad U.S.A. 2014. 111(32):11894-9

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This blog is written by Cabot Institute member Donald Fraser who is a PhD student in the Department of Life Sciences at the University of Bristol, he is studying plant responses to light and the circadian clock.

Breeding cassava for the next generation

Posted on by janet.crompton

Last week I helped to harvest and score cassava tubers a breeding trial at the National Crops Resources Research Institute (NaCRRI). The trial is part of the NEXTGEN Cassava project which applies genetic techniques to conventional breeding and aims to produce new varieties with Cassava brown streak disease (CBSD) and Cassava mosaic disease (CMD) resistance.

Why cassava and what’s the CBSD problem?

Approximately 300 million people rely on cassava as a staple food crop in Africa. It is resilient to seasonal drought, can be grown on poor soils and harvested when needed. However cassava production is seriously threatened by CBSD, which can reduce the quality of tubers by 100% and is currently threatening the food security of millions of people.

Cassava brown streak symptoms on tubers

Crossing cassava from around the world

Cassava varieties show a huge variation in traits including disease resistance. The NEXTGEN Cassava project has crossed 100 parent plants from Latin America with high quality African plants to produce new improved varieties, with higher levels of CBSD and CMD resistance. Crossing involves rubbing the pollen from one parent variety on to the female flower part (pistil) of the second parent variety to produce seeds.

Cassava flowers used to cross different varieties

 

Cutting back on time

The process is not easy. The complex heritability of traits in cassava means that many plants have to be screened to identify plants with the best traits. To cut down on this time, researchers from Cornell University sequenced the DNA from 2,100 seedlings and selected plants containing sequences linked to desirable traits.

Screening for resistance

These plants were transferred to field site in Namulonge, where there is a high level of CBSD, making it easier to spot resistant plants. After 12 months the tubers were dug up and cut into sections. Each root was scored for the severity of CBSD. Plants which  show no disease symptoms have now been selected for the next stage of breeding. Eventually varieties will be tested for their performance at sites across Uganda and given to farmers for their feedback.

We harvested and scored tubers for Cassava brown streak symptoms. I then tagged disease free plants for selection!

 

Time to harvest!

 

Alfred Ozimati is managing the breeding  programme

I helped to score and tag plants, it was hard work! I was impressed by the stamina of the workers who harvested from 8 am until 3 pm without a rest. I was struck by the mammoth task of breeding cassava for so many traits and by the programme manager Alfred Ozimati’s determination to get the work done as quickly as possible. Alfred is currently a  PhD student at Cornell University; he kindly offered to answer these questions:

What are the challenges of conventional breeding and how does sequencing help to address these?

Typical conventional breeding cycle of cassava is 8-10 years before parents are selected for crossing. The sequencing information allows a breeder to select parents early at the seedling stage, allowing more crossing cycles over time than conventional cassava breeding. With sequencing, the process of releasing varieties with improved CBSD and CMD resistance should take about 5 years.

What are your long term hopes for the project and the future of cassava breeding?

We hope to use genomic selection routinely, to address any other challenges cassava as a crop of second importance to Uganda will face. And also to take the technology to other East African, cassava breeding programs to faster address their major breeding constraints.

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This blog has been written by University of Bristol Cabot Institute member Katie Tomlinson from the School of Biological Sciences.  Katie’s area of research is to generate and exploit an improved understanding of cassava brown streak disease (CBSD) to ensure sustainable cassava production in Africa.  This blog has been reposted with kind permission from Katie’s blog Cassava Virus.

 

Katie Tomlinson

More from this blog series:  

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