Record Details

Characterizing patterns of seasonal drought stress for use in common bean breeding in East Africa under present and future climates

CGSpace

View Archive Info
 
 
Field Value
 
Title Characterizing patterns of seasonal drought stress for use in common bean breeding in East Africa under present and future climates
 
Creator Jha, Prakash K.
Beebe, Steve
Alvareztoro, Patricia
Mukankusi, Clare
Ramirez-Villegas, Julian
 
Subject beans
crop improvement
climate change
climate change adaptation
drought stress-water stress
computer applications
crop production
crop modelling
 
Description Common bean (Phaseolus vulgaris L.) is the second most important source of dietary protein and the third most important source of calories in Africa, especially for the poor. In East Africa, drought is an important constraint to bean production. Therefore, breeding programs in East Africa have been trying to develop drought resistant varieties of common bean. To do this, breeders need information about seasonal drought stress patterns including their onset, intensity, and duration in the target area of the breeding program, so that they can mimic this pattern during field trials. Using the Decision Support for Agrotechnology Transfer (DSSAT) v4.7 model together with historical and future (Coupled Model Inter-comparison Project 6, CMIP6) climate data, this study categorized Ethiopia, Tanzania, and Uganda into different target population of environments (TPEs) based on historical and future seasonal drought stress patterns. We find that stress-free conditions generally dominate across the three countries under historical conditions (50–80% frequency). These conditions are projected to increase in frequency in Ethiopia by 2–10% but the converse is true for Tanzania (2–8% reduction) and Uganda (17–20% reduction) by 2050 depending on the Shared Socioeconomic Pathway (SSP). Accordingly, by 2050, terminal drought stresses of various intensities (moderate, severe, extreme) are prevalent in 34% of Uganda, around a quarter of Ethiopia, and 40% of the bean growing environments in Tanzania. The TPEs identified in each country serve as a basis for prioritizing breeding activities in national programs. However, to optimize resource use in international breeding programs to develop genotypes that are resilient to future projected stress patterns, we argue that common bean breeding programs should focus primarily on identifying genotypes with tolerance to severe terminal drought, with co-benefits in relation to adaptation to moderate and extreme terminal drought. Little to no emphasis on heat stress is warranted by 2050s.
 
Date 2023-10-05
2023-10-09T15:02:23Z
2023-10-09T15:02:23Z
 
Type Journal Article
 
Identifier Jha, P.K.; Beebe, S.; Alvareztoro, P.; Mukankusi, C.; Ramirez-Villegas, J. (2023) Characterizing patterns of seasonal drought stress for use in common bean breeding in East Africa under present and future climates. Agricultural and Forest Meteorology 342: 109735. ISSN: 0168-1923
0168-1923
https://hdl.handle.net/10568/132184
https://doi.org/10.1016/j.agrformet.2023.109735
 
Language en
 
Rights CC-BY-4.0
Open Access
 
Format 109735
application/pdf
 
Publisher Elsevier
 
Source Agricultural and Forest Meteorology