![\"Photo:](\"http:\/\/www.generationcp.org\/sunsetblog\/wp-content\/uploads\/2015\/09\/Sorghum_AgBra1.jpg\" "\\"Photo:")
<\/a>Sorghum is already a drought-hardy crop, and is a critical food source across Africa\u2019s harsh, semi-arid regions where water-intensive crops simply cannot survive. Now, as rainfall patterns become increasingly erratic and variable worldwide, scientists warn of the need to improve sorghum\u2019s broad adaptability to drought.<\/em><\/strong><\/span><\/p>\nCrop researchers across the world are now on the verge of doing just that. Through support from the CGIAR Generation Challenge Programme (GCP)<\/a>, advanced breeding methods are enhancing the capacity of African sorghum breeders to deliver more robust varieties that will help struggling farmers and feed millions of poor people across sub-Saharan Africa.<\/p>\n From Sudanese savannah to the Sahara\u2019s desert fringes, sorghum thrives in a diverse range of environments. First domesticated in East Africa some 6000 years ago, it is well adapted to hot, dry climates and low soil fertility, although still depends on receiving some rainfall to grow and is very sensitive to flooding.<\/p>\n In developed countries such as Australia, sorghum is grown almost exclusively to make feed for cattle, pigs and poultry, but in many African countries millions of poor rural people directly depend on the crop in their day-to-day lives.<\/p>\n In countries like Mali sorghum is an important staple crop. It is eaten in many forms such as couscous or t\u00f4<\/em> (a kind of thick porridge), it is used for making local beer, and its straw is a vital source of feed for livestock.<\/p>\n While the demand for, and total production of, sorghum has doubled in West Africa in the last 20 years, yields have generally remained low due to a number of causes, from drought and problematic soils, to pests and diseases.<\/p>\n \u201cIn Mali, for instance, the average grain yield for traditional varieties of sorghum has been less than one tonne per hectare,\u201d says Eva Weltzein-Rattunde, Principal Scientist for Mali\u2019s sorghum breeding programme at the International Crops Research Institute for the Semi-Arid-Tropics (ICRISAT)<\/a>.<\/p>\n In a continued quest to integrate ways to increase productivity, GCP launched its Sorghum Research Initiative (RI)<\/a> in 2010. This aimed to investigate and apply the approaches by which genetics and molecular breeding could be used to improve sorghum yields through better adaptability, particularly in the drylands of West Africa where cropping areas are large and rainfall is becoming increasingly rare.<\/p>\n Kick starting the work was a GCP-funded collaboration between project Principal Investigator Niaba T\u00e9m\u00e9<\/a>, plant breeder at Mali\u2019s Institut d\u2019\u00e9conomie rurale<\/em> (IER)<\/a> and the RI\u2019s Product Delivery Coordinator Jean-Fran\u00e7ois Rami of the Centre de coop\u00e9ration internationale en recherche agronomique pour le d\u00e9veloppement<\/em> (CIRAD; Agricultural Research for Development)<\/a>, France, with additional support from the Syngenta Foundation for Sustainable Agriculture<\/a> in Switzerland.<\/p>\n The collaboration aimed to develop ways to improve sorghum\u2019s productivity and adaptation in the Sudano-Sahelian zone<\/a>, starting with Mali in West Africa, and expanding later across the continent to encompass Burkina Faso, Ethiopia, Kenya, Niger and Sudan.<\/p>\n Since 2008, with the help of CIRAD and Syngenta, Niaba and his team at IER have been learning how to use molecular markers<\/a> to develop improved sorghum germplasm through identifying parental lines that are more tolerant and better adapted to the arid and volatile environments of Mali.<\/p>\n The two breeding methods used in the collaboration are known as marker-assisted recurrent selection (MARS) and backcross nested association mapping (BCNAM).<\/p>\n Syngenta, he explains, became involved through its long experience in implementing MARS in maize.<\/p>\n \u201cSyngenta advised the team on how to conduct MARS and ways we could avoid critical pitfalls,\u201d he says. \u201cThey gave us access to using the software they have developed for the analysis of data, and this enabled us to start the programme immediately.\u201d<\/p>\n With the help of the IER team, two bi-parental populations from elite local varieties were developed, targeting two different environments found in sorghum cropping areas in Mali. \u201cWe were then able to use molecular markers through MARS to identify and monitor key regions of the genome in consecutive breeding generations,\u201d says Jean-Fran\u00e7ois.<\/p>\n \u201cWhen we have identified the genome regions on which to focus, we cross the progenies and monitor the resulting new progenies,\u201d he says. \u201cThe improved varieties subsequently go to plant breeders in Mali\u2019s national research program, which will later release varieties to farmers.\u201d<\/p>\n Jean-Fran\u00e7ois is pleased with the success of the MARS project so far. \u201cThe development of MARS addressed a large range of breeding targets for sorghum in Mali, including adaptation to the environment and grain productivity, as well as grain quality, plant morphology and response to diseases,\u201d he says. \u201cIt proved to be efficient in elucidating the complex relationships between the large number of traits that the breeder has to deal with, and translating this into target genetic ideotypes that can be constructed using molecular markers.\u201d<\/p>\n Jean-Fran\u00e7ois says several MARS breeding lines have already shown superior and stable performance in farm testing as compared to current elite lines, and these will be available to breeders in Mali in 2015 to develop new varieties.<\/p>\n Like MARS, the BCNAM approach shows promise for being able to quickly gain improvements in sorghum yield and adaptability to drought, explains Niaba, who is Principal Investigator of the BCNAM project. BCNAM may be particularly effective, he says, in developing varieties that have the grain quality preferences of Malian farmers<\/a>, as well as the drought tolerance that has until now been unavailable.<\/p>\n \u201cBCNAM involves using an elite recurrent parent that is already adapted to local drought conditions, then crossing it with several different specific or donor parents to build up larger breeding populations,\u201d he explains. \u201cThe benefit of this approach is it can lead to detecting elite varieties much faster.\u201d<\/p>\n Eva and her team at ICRISAT have also been collaborating with researchers at IER and CIRAD on the BCNAM project. The approach, she says, has the potential to halve the time it takes to develop local sorghum varieties with improved yield and adaptability to poor soil fertility conditions.<\/p>\n \u201cWe don\u2019t have these types of molecular-breeding resources available in Mali, so it\u2019s really exciting to be a part of this project,\u201d she says. \u201cOverall, we feel the experience is enhancing our capacity here, and that we are closer to delivering more robust sorghum varieties which will help farmers and feed the ever-growing population in West Africa.\u201d<\/p>\n Indeed, during field testing in Mali, BCNAM lines derived from the elite parent variety Grinkan have produced more than twice the yields of Grinkan itself. As they are rolled out in the form of new varieties, the team anticipates that they will have a huge positive impact on farmers\u2019 livelihoods.<\/p>\n In Mali and the wider Sahel region within West Africa, cropping conditions are ideal for sorghum. The climate is harsh, with daily temperatures on the dry, sun-scorched lower plains rarely falling below 30\u00b0C. With no major river system, the threat of drought is ever-present, and communities are entirely dependent on the 500 millimetres of rain that falls during the July and August wet season.<\/p>\n \u201cAll the planting and harvesting is done during the rainy season,\u201d says Niaba. \u201cWe have lakes that are fed by the rain, but when these lakes start to dry up farmers rely mostly on the moisture remaining in the soil.\u201d<\/p>\n Over 17 thousand kilometres to the east of Mali, in north-eastern Australia\u2019s dryland cropping region, situated mainly in the state of Queensland, sorghum is the main summer crop, and is considered a good rotational crop as it performs well under heat and moisture stress. The environment here is similar to Mali\u2019s, with extreme drought a big problem.<\/p>\n Average yields for sorghum in Queensland are double those in Mali\u2014around two tonnes per hectare\u2014yet growers still consider them low, directly limited by the crop\u2019s predominantly water-stressed production environment in Australia.<\/p>\n One of the differentiating factors is soil. \u201cQueensland has a much deeper and more fertile soil compared to Mali, where the soil is shallow, with no mulch or organic matter,\u201d says Niaba. \u201cAlso, there is no management at the farm level in Mali, so when rain comes, if the soil cannot take it, we lose it.\u201d<\/p>\n Another key reason for the difference in yields between Queensland and Mali is that growers in Queensland are sowing a sorghum variety of with a genetic trait that makes it more tolerant to drought.<\/p>\n This trait is called \u2018stay-green\u2019, and over the last two decades it has proven valuable in increasing sorghum yields, using less water, in north-eastern Australia and the southern United States.<\/p>\n Stay-green allows sorghum plants to stay alive and maintain green leaves for longer during post-flowering drought\u2014that is, drought that occurs after the plant has flowered. This means the plants can keep growing and produce more grain in drier conditions.<\/p>\n \u201cWe\u2019ve found that stay-green can improve yields by up to 30 percent in drought conditions with very little downside during a good year,\u201d says Andrew Borrell<\/a> from the Queensland Alliance for Agriculture and Food Innovation (QAAFI)<\/a> at the University of Queensland (UQ) in Australia.<\/p>\n \u201cPlant breeders have known about stay-green for some 30 years,\u201d he says. \u201cThey\u2019d walk their fields and see that the leaves of certain plants would remain green while others didn\u2019t. They knew it was correlated with high yield under drought conditions, but didn\u2019t know why.\u201d<\/p>\n With their almost 20 years working on understanding how stay-green works, Andrew and his colleagues at UQ were invited by GCP in 2012 to take part in the IER\/CIRAD collaborative project, to evaluate the potential for introducing stay-green into Mali\u2019s local sorghum varieties and enriching Malian pre-breeding material for the trait.<\/p>\n A pivotal stage in this new alliance was a 12-month visit to Australia by Niaba and his IER colleague Sidi Coulibaly, to work with Andrew and his team to understand how stay-green drought resistance works in tall Malian sorghum varieties.<\/p>\n \u201cAfrican sorghum is very tall and sensitive to variation in day length,\u201d explains Andrew. \u201cWe have been looking to investigate if the stay-green mechanism operates in tall African sorghums (around four metres tall) in the same way that it does in short Australian sorghum (one metre tall).\u201d<\/p>\n Having just completed a series of experiments at the end of 2014, the UQ team consider their data as preliminary at this stage. \u201cBut it looks like we can get a correlation between stay-green and the size and yield of these Malian lines,\u201d says Andrew. \u201cWe think it\u2019s got great potential.\u201d<\/p>\n Eva Weltzein-Rattunde has played more of an on-the-ground capacity development role in Mali<\/a> since accepting her position at ICRISAT in 1998. She says \u201cthe key challenges have been improving the infrastructure of the national research facilities [in Mali] to do the research as well as increasing the technical training for local agronomists and researchers.\u201d<\/p>\n A large part of GCP\u2019s focus is building just such capacity<\/a> among developing country partners to carry out crop research and breeding independently in future, so they can continue developing new varieties with drought adaptation relevant to their own environmental conditions.<\/p>\n A key objective of the IER team\u2019s Australian visit was to receive training in the methods for improving yields and drought resistance in sorghum breeding lines from both Australia and Mali.<\/p>\n \u201cWe learnt about association mapping, population genetics and diversity, molecular breeding, crop modelling using climate forecasts, and sorghum physiology, plus a lot more,\u201d says Niaba. This training complemented previous training Niaba and IER researchers had from CIRAD and ICRISAT through the MARS and BCNAM projects.<\/p>\n \u201cWe [CIRAD] have a long collaboration in sorghum research in Mali and training young scientists has always been part of our mission,\u201d says Jean-Fran\u00e7ois. \u201cWe\u2019ve hosted several IER students here in France and we are always interacting with our colleagues in Mali either over the phone or travelling to Mali to give technical workshops in molecular breeding.\u201d<\/p>\n Working together to implement MARS in the sorghum breeding program in Mali represented many operational challenges, Jean-Fran\u00e7ois explains. \u201cThe approach requires a very tight integration of different and complementary skills, including a strong conventional breeding capacity, accurate breeders\u2019 knowledge, efficient genotyping technologies, and skills for efficient genetic analyses,\u201d he says.<\/p>\n Because of this requirement, he adds, there are very few reported experiences of the successful implementation of MARS.\u00a0 It is also the reason why these kinds of projects would normally not be undertaken in a developing country like Mali, but for the support of GCP and the dedicated mentorship of Jean-Fran\u00e7ois.<\/p>\n In addition to developing capacity, Jean-Fran\u00e7ois says one of the great successes of both the MARS and the BCNAM projects was how they brought together Mali\u2019s sorghum research groups working at IER and ICRISAT in a common effort to develop new genetic resources for sorghum breeding.<\/p>\n \u201cThis work has strengthened the IER and ICRISAT partnerships around a common resource. The large multiparent populations that have been developed are analysed collectively to decipher the genetic control of important traits for sorghum breeding in Mali,\u201d says Jean-Fran\u00e7ois. \u201cThis community development is another major achievement of the Sorghum Research Initiative.\u201d The major challenge, he adds, will be whether this community can be kept together beyond GCP.<\/p>\n Considering the numerous \u2018non-GCP\u2019 activities that have already been initiated in Africa as a result of the partnerships forged through GCP research, Jean-Fran\u00e7ois sees a clear indication that these connections will endure well beyond GCP\u2019s time frame.<\/p>\n Among the new activities Jean-Fran\u00e7ois lists are both regional and national projects aimed at building on what has already been achieved through GCP and linking national partners together. These include the West African Agricultural Productivity Program (WAAPP), the West Africa Platform being launched by CIRAD as a continuation of the MARS innovation, and another MARS project in Senegal and Niger through the Feed the Future Innovation Lab for Collaborative Research on Sorghum and Millet at Kansas State University.<\/p>\n \u201cThese are all activities which will help maintain the networks we\u2019ve built,\u201d Jean-Fran\u00e7ois says. \u201cI think it is very important that these networks of people with common objectives stick together.\u201d<\/p>\n \u201cI can\u2019t talk enough of the positive stories from GCP,\u201d he adds. \u201cGCP initiated something, and the benefits for me and my country I cannot measure. Right now, GCP has reached its sunset; but for me it is a sunrise, because what we have been left with is so important.\u201d<\/p>\n Sorghum is already a drought-hardy crop, and is a critical food source across Africa\u2019s harsh, semi-arid regions where water-intensive crops simply cannot survive. Now, as rainfall patterns become increasingly erratic and variable worldwide, scientists warn of the need to improve sorghum\u2019s broad adaptability to drought. Crop researchers across the world are now on the […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[87,140,304],"tags":[109,16,18,17,86,11,38,9,575,229,318,401,69,162,360,355,223,391,70,112,364,384,203,357,210,245,14,407,49,121,97,574,71,441,73,349,139,177,142,507,74,345,505,377,380,68,356,321,324,376,262,379,322,506,367],"class_list":["post-4524","post","type-post","status-publish","format-standard","hentry","category-africa","category-crop-breeding-2","category-sorghum-2","tag-application-and-impact","tag-capacity-building","tag-crop-breeding","tag-crop-improvement","tag-drought-tolerance","tag-food-security","tag-molecular-breeding","tag-partnerships","tag-africa","tag-australia","tag-backcross-nested-association-mapping-bcnam","tag-breeding-efficiency","tag-burkina-faso","tag-cirad","tag-collaboration","tag-crop-productivity","tag-disease-resistance","tag-drylands","tag-ethiopia","tag-genetic-tools","tag-genetics-2","tag-grain-quality","tag-heat-tolerance","tag-higher-yields","tag-icrisat","tag-ier-mali","tag-impact","tag-improved-varieties","tag-infrastructure","tag-integrated-approach","tag-integrated-breeding","tag-integrated-breeding-platform","tag-kenya","tag-locally-adapted-varieties","tag-mali","tag-marker-assisted-breeding","tag-marker-assisted-recurrent-selection-mars","tag-marker-assisted-selection-mas","tag-molecular-markers","tag-network-building","tag-niger","tag-poor-soils","tag-qaafi-australia","tag-sahel","tag-sfsa","tag-sorghum","tag-staple-foods","tag-stay-green","tag-sudan","tag-sudano-sahelian-region","tag-syngenta","tag-training","tag-university-of-queensland","tag-waapp","tag-west-africa"],"_links":{"self":[{"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/posts\/4524","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/comments?post=4524"}],"version-history":[{"count":42,"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/posts\/4524\/revisions"}],"predecessor-version":[{"id":5197,"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/posts\/4524\/revisions\/5197"}],"wp:attachment":[{"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/media?parent=4524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/categories?post=4524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.generationcp.org\/sunsetblog\/wp-json\/wp\/v2\/tags?post=4524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/a>Sorghum at home in Africa<\/h3>\n
<\/a><\/a>Sorghum gains from molecular research<\/h3>\n
<\/a>\u201cMARS identifies regions of the genome that control important traits,\u201d explains Jean-Fran\u00e7ois. \u201cIt uses molecular markers to explore more combinations in the plant populations, and thus increases breeding efficiency.\u201d<\/p>\n<\/a><\/a>Mali and Queensland \u2013 <\/strong>similar problem, different soil<\/h3>\n
<\/a>Making sorghum stay green, longer<\/h3>\n
Stay-green\u2019s potential in Mali<\/h3>\n
<\/a>Sharing knowledge as well as germplasm<\/h3>\n
<\/a><\/a><\/a>\u201cGCP provided the perfect environment to develop the MARS approach,\u201d says Jean-Fran\u00e7ois. \u201cIt brought together people with complementary skills, developed the Integrated Breeding Platform (IPB)<\/a>, and provided tools and services to support the programme.\u201d<\/p>\nGCP\u2019s sunset is Mali\u2019s sunrise<\/h3>\n
<\/a><\/a>For Niaba, GCP provided the initial boost needed for these networks to emerge and thrive. \u201cWe had some contacts before, but we didn\u2019t have the funds to really get into a collaboration. This has been made possible by GCP. Now we\u2019re motivated and are making connections with other people on how we can continue working with the material we have developed.\u201d<\/p>\nMore links<\/h3>\n
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