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
![[img]](http://oar.icrisat.org/style/images/fileicons/application_pdf.png) |
PDF
- Published Version
Available under License ["licenses_description_cc_attribution" not defined]. Download (2MB) |
Abstract
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.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : West & Central Africa |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | drought tolerance, early-maturity, genetic gains, hybrids, stress tolerance |
| Subjects: | Others > Drought Tolerance Others > Genetics and Genomics Others > Wheat Others > Maize |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 23 Feb 2024 09:58 |
| Last Modified: | 23 Feb 2024 09:58 |
| URI: | http://oar.icrisat.org/id/eprint/12511 |
| Official URL: | https://www.frontiersin.org/journals/plant-science... |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | We thank all the partners in the public and private sector institutions in the ESA, and CIMMYT researchers and technicians for running the era trial network. We also acknowledge the administrative staff at the CIMMYT-Zimbabwe office for coordinating and distributing the seed shipments. |
| Links: |
Actions (login required)
 |
View Item |
Altmetric
Altmetric