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Genetic gains in early maturing maize hybrids developed by the International Maize and Wheat Improvement Center in Southern Africa during 2000–2018

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Relation http://oar.icrisat.org/12511/
https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1321308/full
https://doi.org/10.3389/fpls.2023.1321308
 
Title Genetic gains in early maturing maize hybrids developed by the International Maize and Wheat Improvement Center in Southern Africa during 2000–2018
 
Creator Tarekegne, A
Wegary, D
Cairns, J E
Zaman-Allah, M
Beyene, Y
Negera, D
Teklewold, A
Tesfaye, K
Jumbo, M B
Das, B
Nhamucho, E J
Simpasa, K
Kaonga, K K E
Mashingaidze, K
Thokozile, N
Mhike, X
Prasanna, B M
 
Subject Drought Tolerance
Genetics and Genomics
Wheat
Maize
 
Description Genetic gain estimation in a breeding program provides an opportunity to monitor breeding efficiency and genetic progress over a specific period. The present study was conducted to (i) assess the genetic gains in grain yield of the early maturing maize hybrids developed by the International Maize and Wheat Improvement Center (CIMMYT) Southern African breeding program during the period 2000–2018 and (ii) identify key agronomic traits contributing to the yield gains under various management conditions. Seventy-two early maturing hybrids developed by CIMMYT and three commercial checks were assessed under stress and non-stress conditions across 68 environments in seven eastern and southern African countries through the regional on-station trials. Genetic gain was estimated as the slope of the regression of grain yield and other traits against the year of first testing of the hybrid in the regional trial. The results showed highly significant (p< 0.01) annual grain yield gains of 118, 63, 46, and 61 kg ha−1 year−1 under optimum, low N, managed drought, and random stress conditions, respectively. The gains in grain yield realized in this study under both stress and non-stress conditions were associated with improvements in certain agronomic traits and resistance to major maize diseases. The findings of this study clearly demonstrate the significant progress made in developing productive and multiple stress-tolerant maize hybrids together with other desirable agronomic attributes in CIMMYT’s hybrid breeding program.
 
Publisher Frontiers Media
 
Date 2024-01-16
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights cc_attribution
 
Identifier http://oar.icrisat.org/12511/1/Frontiers%20in%20Plant%20Science_14_1-17_2024.pdf
Tarekegne, A and Wegary, D and Cairns, J E and Zaman-Allah, M and Beyene, Y and Negera, D and Teklewold, A and Tesfaye, K and Jumbo, M B and Das, B and Nhamucho, E J and Simpasa, K and Kaonga, K K E and Mashingaidze, K and Thokozile, N and Mhike, X and Prasanna, B M (2024) Genetic gains in early maturing maize hybrids developed by the International Maize and Wheat Improvement Center in Southern Africa during 2000–2018. Frontiers in Plant Science (TSI), 14. 01-17. ISSN 1664-462X