Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments
Grain yield (GY) in maize (Zea mays L.) is influenced by multiple component traits, with ear- and tassel-related traits playing a significant role. Despite their importance, these traits receive less emphasis in tropical maize breeding. This study aimed to: (i) assess the inheritance and heterosis o...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Frontiers Media
2025
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| Online Access: | https://hdl.handle.net/10568/178356 |
| _version_ | 1855528396761595904 |
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| author | Kosgei, Titus Makumbi, Dan Mageto, Edna Kavai, Hilda Musula Ochieng, George O. Adhiambo, Carolyne A. Kasango, Joseph S. Kamau, Rachael M. Sserumaga, Julius Pyton |
| author_browse | Adhiambo, Carolyne A. Kamau, Rachael M. Kasango, Joseph S. Kavai, Hilda Musula Kosgei, Titus Mageto, Edna Makumbi, Dan Ochieng, George O. Sserumaga, Julius Pyton |
| author_facet | Kosgei, Titus Makumbi, Dan Mageto, Edna Kavai, Hilda Musula Ochieng, George O. Adhiambo, Carolyne A. Kasango, Joseph S. Kamau, Rachael M. Sserumaga, Julius Pyton |
| author_sort | Kosgei, Titus |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Grain yield (GY) in maize (Zea mays L.) is influenced by multiple component traits, with ear- and tassel-related traits playing a significant role. Despite their importance, these traits receive less emphasis in tropical maize breeding. This study aimed to: (i) assess the inheritance and heterosis of ear and tassel traits, and (ii) investigate their genetic correlation with GY. Thirty tropical maize inbred lines were used to develop 150 hybrids, which were evaluated under artificial Striga hermonthica infestation, managed drought stress, and rainfed conditions over two years. General (GCA) and specific (SCA) combining ability mean squares were significant (P< 0.05) for most traits, indicating the contribution of both additive and nonadditive gene action. GCA sums of squares predominated over SCA, suggesting that additive gene action controlled the inheritance of ear, husk, and tassel traits. Broad-sense heritability was high for husk (H-2 = 0.59-0.89), ear (H-2 = 0.71-0.93), and tassel (H-2 = 0.78-0.95) traits. Fifteen inbred lines exhibited significant positive GCA effects for ear traits, suggesting the presence of favorable alleles associated with increased ear length (ERL) and circumference (ERC). Additionally, 23 inbred lines exhibited favorable GCA effects for reduced tassel size. Mid-parent heterosis for ERL (41%) and ERC (22%) was greater under managed drought stress. Both ERL and ERC were strongly correlated with GY (r(g) = 0.58-0.96), suggesting their suitability for inclusion in a selection index. Path analysis identified ERL and ERC as having significant positive direct effects on GY, while ear aspect had a negative direct effect on GY across all conditions. Selection for ear and tassel traits in tropical maize is recommended to develop more efficient inbred lines for higher grain yield. |
| format | Journal Article |
| id | CGSpace178356 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Frontiers Media |
| publisherStr | Frontiers Media |
| record_format | dspace |
| spelling | CGSpace1783562025-12-08T10:11:39Z Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments Kosgei, Titus Makumbi, Dan Mageto, Edna Kavai, Hilda Musula Ochieng, George O. Adhiambo, Carolyne A. Kasango, Joseph S. Kamau, Rachael M. Sserumaga, Julius Pyton combining ability heritability heterosis path analysis striga hermonthica maize Grain yield (GY) in maize (Zea mays L.) is influenced by multiple component traits, with ear- and tassel-related traits playing a significant role. Despite their importance, these traits receive less emphasis in tropical maize breeding. This study aimed to: (i) assess the inheritance and heterosis of ear and tassel traits, and (ii) investigate their genetic correlation with GY. Thirty tropical maize inbred lines were used to develop 150 hybrids, which were evaluated under artificial Striga hermonthica infestation, managed drought stress, and rainfed conditions over two years. General (GCA) and specific (SCA) combining ability mean squares were significant (P< 0.05) for most traits, indicating the contribution of both additive and nonadditive gene action. GCA sums of squares predominated over SCA, suggesting that additive gene action controlled the inheritance of ear, husk, and tassel traits. Broad-sense heritability was high for husk (H-2 = 0.59-0.89), ear (H-2 = 0.71-0.93), and tassel (H-2 = 0.78-0.95) traits. Fifteen inbred lines exhibited significant positive GCA effects for ear traits, suggesting the presence of favorable alleles associated with increased ear length (ERL) and circumference (ERC). Additionally, 23 inbred lines exhibited favorable GCA effects for reduced tassel size. Mid-parent heterosis for ERL (41%) and ERC (22%) was greater under managed drought stress. Both ERL and ERC were strongly correlated with GY (r(g) = 0.58-0.96), suggesting their suitability for inclusion in a selection index. Path analysis identified ERL and ERC as having significant positive direct effects on GY, while ear aspect had a negative direct effect on GY across all conditions. Selection for ear and tassel traits in tropical maize is recommended to develop more efficient inbred lines for higher grain yield. 2025-08-10 2025-11-27T20:39:46Z 2025-11-27T20:39:46Z Journal Article https://hdl.handle.net/10568/178356 en Open Access application/pdf Frontiers Media Kosgei, T., Makumbi, D., Mageto, E. K., Kavai, H. M., Ochieng, G. O., Adhiambo, C. A., Kasango, J. S., Kimutai, J. J. C., Kamau, R. M., & Sserumaga, J. P. (2025). Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments. Frontiers in Plant Science, 16. https://doi.org/10.3389/fpls.2025.1618054 |
| spellingShingle | combining ability heritability heterosis path analysis striga hermonthica maize Kosgei, Titus Makumbi, Dan Mageto, Edna Kavai, Hilda Musula Ochieng, George O. Adhiambo, Carolyne A. Kasango, Joseph S. Kamau, Rachael M. Sserumaga, Julius Pyton Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments |
| title | Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments |
| title_full | Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments |
| title_fullStr | Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments |
| title_full_unstemmed | Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments |
| title_short | Genetic analysis of ear, husk, and tassel traits in tropical maize under diverse environments |
| title_sort | genetic analysis of ear husk and tassel traits in tropical maize under diverse environments |
| topic | combining ability heritability heterosis path analysis striga hermonthica maize |
| url | https://hdl.handle.net/10568/178356 |
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