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Identification of drought, heat and combined drought and heat tolerant donors in maize (Zea mays L.)

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Title Identification of drought, heat and combined drought and heat tolerant donors in maize (Zea mays L.)
 
Creator Cairns, Jill E.
Crossa, J.
Zaidi, P.H.
Grudloyma P
Sánchez, C.
Araus, J.L.
Makumbi, Dan
Magorokosho, Cosmos
Bänziger, Marianne
Menkir A
Hearne S
Atlin, Gary
 
Subject yields
agriculture
climate
heat tolerance
drought tolerance
maize
stress
genetics
 
Description Low maize yields and the impacts of climate change on maize production highlight the need to improve yields in eastern and southern Africa. Climate projections suggest higher temperatures within drought-prone areas. Research in model species suggests that tolerance to combined drought and heat stress is genetically distinct from tolerance to either stress alone, but this has not been confirmed in maize. In this study we evaluated 300 maize inbred lines testcrossed to CML539. Experiments were conducted under optimal conditions, reproductive stage drought stress, heat stress and combined drought and heat stress. Lines with high levels of tolerance to drought and combined drought and heat stress were identified. Significant genotype x trial interaction and very large plot residuals were observed; consequently, the repeatability of individual managed stress trials was low. Tolerance to combined drought and heat stress in maize was genetically distinct from tolerance to individual stresses, and tolerance to either stress alone did not confer tolerance to combined drought and heat stress. This finding has major implications for maize drought breeding. Many current drought donors and key inbreds used in widely-grown African hybrids were susceptible to drought stress at elevated temperatures. Several donors tolerant to drought and combined drought and heat stress, notably La Posta Sequia C7-F64-2-6-2-2 and DTPYC9-F46-1-2-1-2, need to be incorporated into maize breeding pipelines.
 
Date 2013-07
2013-05-13T16:15:02Z
2013-05-13T16:15:02Z
 
Type Journal Article
 
Identifier Cairns JE, Crossa J, Zaidi PH, Grudloyma P, Sanchez C, Araus JL, Makumbi D, Magorokosho C, Bänziger M, Menkir A, Hearne S, Atlin GN. 2013. Identification of drought, heat and combined drought and heat tolerant donors in maize (Zea mays L.). Crop Science.
0011-183X
1435-0653
https://hdl.handle.net/10568/28990
https://doi.org/10.2135/cropsci2012.09.0545
 
Language en
 
Rights CC-BY-NC-ND-4.0
Open Access
 
Format application/pdf
 
Publisher Wiley
 
Source Crop Science