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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
| Content Provider | Consultative Group on International Agricultural Research (CGIAR) |
|---|---|
| Author | Tarekegne, Amsal Tesfaye Gissa, Dagne Wegary Cairns, Jill E. Zaman-Allah, Mainassara Beyene, Yoseph Negera, Demewoz Chere, Adefris Teklewold Fantaye, Kindie Tesfaye Jumbo, MacDonald B. Das, Biswanath Nhamucho, Egas Simpasa, Kelvin Kaonga, Kesbell K. Mashingaidze, Kingstone Ndhlela, Thokozile Mhike, Xavier Prasanna, Boddupalli M. |
| 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. |
| Sponsorship | Bill & Melinda Gates Foundation United States Agency for International Development US Foundation for Food and Agriculture Research CGIAR Trust Fund |
| Related Links | https://cgspace.cgiar.org/items/db46a0e1-f1f8-4c27-9ca1-9c1047541047 |
| File Format | |
| ISSN | 1664462X |
| DOI | 10.3389/fpls.2023.1321308 |
| Journal | Frontiers in Plant Science |
| Volume Number | 14 |
| Language | English |
| Publisher | Frontiers Media |
| Access Restriction | Open |
| Rights License | CC-BY-4.0 |
| Subject Keyword | Drought Tolerance Early Maturation Genetic Gain Hybrids Stress Maize |
| Content Type | Text |
| Resource Type | Article |
| Subject | Agronomy and Crop Science Food Science Plant Science |
