Is Cassava the Answer to African Climate Change Adaptation?

Title 
Is Cassava the Answer to African Climate Change Adaptation? 
Publication Type 
Journal Article 
Authors 
Jarvis A, Ramirez-Villegas J, Herrera Campo BV, Navarro-Racines C 
Year of Publication 
2012 
Publisher 
Springer 
Place Published 
New York 
Journal 
Tropical Plant Biology 
ISSN 
1935-9764 
Keywords 
Africa, banana, Beans, breeding, brown streak, Cassava, Climate change, diseases, drought, East Africa, EcoCrop, food security, global warming, Maize, mealybug, millet, mosaic, pests, potato, Rice, root, soil, Sorghum, south america, southern africa, West Africa, Wheat, yuca 
URL 
http://www.springerlink.com/content/n36675226277455j/ 
DOI 
10.1007/s12042-012-9096-7 
Abstract 

This paper examines the impacts of climate change on cassava production in Africa, and questions whether cassava can play an important role in climate change adaptation. First, we examine the impacts that climate change will likely have on cassava itself, and on other important staple food crops for Africa including maize, millets, sorghum, banana, and beans based on projections to 2030. Results indicate that cassava is actually positively impacted in many areas of Africa, with −3.7% to +17.5% changes in climate suitability across the continent. Conversely, for other major food staples, we found that they are all projected to experience negative impacts, with the greatest impacts for beans (−16% ± 8.8), potato (−14.7 ± 8.2), banana (−2.5% ± 4.9), and sorghum (−2.66% ± 6.45). We then examined the likely challenges that cassava will face from pests and diseases through the use of ecological niche modeling for cassava mosaic disease, whitefly, brown streak disease and cassava mealybug. The findings show that the geographic distribution of these pests and diseases are projected to change, with both new areas opening up and areas where the pests and diseases are likely to leave or reduce in pressure. We finish the paper by looking at the abiotic traits of priority for crop adaptation for a 2030 world, showing that greater drought tolerance could bring some benefits in all areas of Africa, and that cold tolerance in Southern Africa will continue to be a constraint for cassava despite a warmer 2030 world, hence breeding needs to keep a focus on this trait. Importantly, heat tolerance was not found to be a major priority for crop improvement in cassava in the whole of Africa, but only in localized pockets of West Africa and the Sahel. The paper concludes that cassava is potentially highly resilient to future climatic changes and could provide Africa with options for adaptation whilst other major food staples face challenges.

 
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