Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa
Drought is a major constraint on maize (Zea mays L.) production and productivity in Sub-Saharan Africa (SSA). The increase in frequency and severity of drought, driven by climate change, is expected to worsen in the future. These occurrences are likely to adversely affect maize production and produc...
| Autores principales: | , , , , , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Frontiers Media
2024
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/170012 |
| _version_ | 1855540209306828800 |
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| author | Kulai Amadu Manigben Beyene, Yoseph Chaikam, Vijay Tongoona, Pangirayi B. Danquah, Eric Ifie, Beatrice E. Aleri, Isaiah Chavangi, Andrew Prasanna, Boddupalli M. Gowda, Manje |
| author_browse | Aleri, Isaiah Beyene, Yoseph Chaikam, Vijay Chavangi, Andrew Danquah, Eric Gowda, Manje Ifie, Beatrice E. Kulai Amadu Manigben Prasanna, Boddupalli M. Tongoona, Pangirayi B. |
| author_facet | Kulai Amadu Manigben Beyene, Yoseph Chaikam, Vijay Tongoona, Pangirayi B. Danquah, Eric Ifie, Beatrice E. Aleri, Isaiah Chavangi, Andrew Prasanna, Boddupalli M. Gowda, Manje |
| author_sort | Kulai Amadu Manigben |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Drought is a major constraint on maize (Zea mays L.) production and productivity in Sub-Saharan Africa (SSA). The increase in frequency and severity of drought, driven by climate change, is expected to worsen in the future. These occurrences are likely to adversely affect maize production and productivity, threatening the economic and social stability of millions of smallholder farmers. Understanding the genetics of hybrid performance under drought stress is crucial for designing breeding strategies to develop high-yielding hybrids. This study aimed to (i) evaluate the performance of three-way cross hybrids developed from elite inbred lines, including several drought-tolerant lines, using a line-by-tester mating design, and (ii) estimate the general combining ability (GCA) and specific combining ability (SCA) effects of the tropical maize inbred lines under managed drought and optimum conditions. A total of 265 maize inbred lines from the CIMMYT global maize breeding program were used as parents and crossed to six single cross testers to generate 795 testcross hybrids. These hybrids, along with six commercial hybrids as a check, were evaluated under managed drought and optimum conditions. Significant (p < 0.001) variations were observed among genotypes and genotypes-by-environment interactions (GEIs) for grain yield and other traits. There was a preponderance of GCA variance (lines and tester) over SCA variance, indicating that additive effects were more important in determining grain yield and other key traits under both managed drought and optimum conditions. Ten inbred lines (S2_8, S10_1, S6_4, S10_14, S2_14, S10_15, S8_7, S2_3, S8_15, and S13_5) with desirable GCA effects for grain yield and other traits were identified. Fourteen testcross hybrids were identified with high grain yield and desirable agronomic traits under both drought and optimum conditions. The identified lines and hybrids are useful sources to be used in breeding and deploying as stress-tolerant hybrids. High correlations observed between observed and GCA-predicted hybrid performance suggest the possibility to evaluate more hybrids with fixed resources. The study demonstrates that it is feasible to obtain high-yielding and drought-tolerant lines and hybrids. These testcross hybrids should undergo rigorous on-farm trials to ensure consistent performance before commercialization and release. Deploying these hybrids could help in mitigating the effects of drought stress in SSA and contribute to improved maize productivity in the region. |
| format | Journal Article |
| id | CGSpace170012 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Frontiers Media |
| publisherStr | Frontiers Media |
| record_format | dspace |
| spelling | CGSpace1700122025-12-08T10:29:22Z Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa Kulai Amadu Manigben Beyene, Yoseph Chaikam, Vijay Tongoona, Pangirayi B. Danquah, Eric Ifie, Beatrice E. Aleri, Isaiah Chavangi, Andrew Prasanna, Boddupalli M. Gowda, Manje drought grain yields combining ability maize crossbreds hybrids smallholders Drought is a major constraint on maize (Zea mays L.) production and productivity in Sub-Saharan Africa (SSA). The increase in frequency and severity of drought, driven by climate change, is expected to worsen in the future. These occurrences are likely to adversely affect maize production and productivity, threatening the economic and social stability of millions of smallholder farmers. Understanding the genetics of hybrid performance under drought stress is crucial for designing breeding strategies to develop high-yielding hybrids. This study aimed to (i) evaluate the performance of three-way cross hybrids developed from elite inbred lines, including several drought-tolerant lines, using a line-by-tester mating design, and (ii) estimate the general combining ability (GCA) and specific combining ability (SCA) effects of the tropical maize inbred lines under managed drought and optimum conditions. A total of 265 maize inbred lines from the CIMMYT global maize breeding program were used as parents and crossed to six single cross testers to generate 795 testcross hybrids. These hybrids, along with six commercial hybrids as a check, were evaluated under managed drought and optimum conditions. Significant (p < 0.001) variations were observed among genotypes and genotypes-by-environment interactions (GEIs) for grain yield and other traits. There was a preponderance of GCA variance (lines and tester) over SCA variance, indicating that additive effects were more important in determining grain yield and other key traits under both managed drought and optimum conditions. Ten inbred lines (S2_8, S10_1, S6_4, S10_14, S2_14, S10_15, S8_7, S2_3, S8_15, and S13_5) with desirable GCA effects for grain yield and other traits were identified. Fourteen testcross hybrids were identified with high grain yield and desirable agronomic traits under both drought and optimum conditions. The identified lines and hybrids are useful sources to be used in breeding and deploying as stress-tolerant hybrids. High correlations observed between observed and GCA-predicted hybrid performance suggest the possibility to evaluate more hybrids with fixed resources. The study demonstrates that it is feasible to obtain high-yielding and drought-tolerant lines and hybrids. These testcross hybrids should undergo rigorous on-farm trials to ensure consistent performance before commercialization and release. Deploying these hybrids could help in mitigating the effects of drought stress in SSA and contribute to improved maize productivity in the region. 2024 2025-01-26T21:44:41Z 2025-01-26T21:44:41Z Journal Article https://hdl.handle.net/10568/170012 en Open Access application/pdf Frontiers Media Manigben, K. A., Beyene, Y., Chaikam, V., Tongoona, P. B., Danquah, E. Y., Ifie, B. E., Aleri, I., Chavangi, A., Prasanna, B. M., & Gowda, M. (2024). Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa. Frontiers in Plant Science, 15, 1471041. https://doi.org/10.3389/fpls.2024.1471041 |
| spellingShingle | drought grain yields combining ability maize crossbreds hybrids smallholders Kulai Amadu Manigben Beyene, Yoseph Chaikam, Vijay Tongoona, Pangirayi B. Danquah, Eric Ifie, Beatrice E. Aleri, Isaiah Chavangi, Andrew Prasanna, Boddupalli M. Gowda, Manje Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa |
| title | Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa |
| title_full | Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa |
| title_fullStr | Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa |
| title_full_unstemmed | Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa |
| title_short | Testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in Sub-Saharan Africa |
| title_sort | testcross performance and combining ability of intermediate maturing drought tolerant maize inbred lines in sub saharan africa |
| topic | drought grain yields combining ability maize crossbreds hybrids smallholders |
| url | https://hdl.handle.net/10568/170012 |
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