Relationships among traits of tropical early maize cultivars in contrasting environments
Secondary traits can improve precision with which drought or low soil nitrogen (low-N) tolerant maize (Zea mays L.) genotypes are identified, compared to measuring only grain yield under each stress. The objective of this study was to identify secondary traits for indirect selection for yield improv...
| Autores principales: | , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
2011
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/88147 |
| _version_ | 1855523712163381248 |
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| author | Badu-Apraku, Baffour Akinwale, R.O. Ajala, S.O. Menkir, A. Fakorede, M.A.B. Oyekunle, M. |
| author_browse | Ajala, S.O. Akinwale, R.O. Badu-Apraku, Baffour Fakorede, M.A.B. Menkir, A. Oyekunle, M. |
| author_facet | Badu-Apraku, Baffour Akinwale, R.O. Ajala, S.O. Menkir, A. Fakorede, M.A.B. Oyekunle, M. |
| author_sort | Badu-Apraku, Baffour |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Secondary traits can improve precision with which drought or low soil nitrogen (low-N) tolerant maize (Zea mays L.) genotypes are identified, compared to measuring only grain yield under each stress. The objective of this study was to identify secondary traits for indirect selection for yield improvement under drought and/or low-N. Two sets of experiments were conducted at four locations in Nigeria for 2 yr. In the first experiment, cultivars were evaluated under low (30 kg ha−1) and high (90 kg ha−1) N and drought and well-watered environments in the second experiment. Most reliable traits for selection for yield under drought were ear aspect (EASP), plant aspect (PASP), anthesis-silking interval (ASI), and number of ears per plant (EPP). Days to anthesis (DYA) and silking (DYS) were the most reliable under well-watered environments. Under low-N, most reliable traits were DYA, DYS, stay green characteristic (LDTH), ASI, plant height (PLHT), EPP, EASP, and PASP whereas PLHT, EPP, PASP, and EASP were most reliable traits under high-N environments. The ASI, EPP, EASP, and PASP were identified as most reliable traits for simultaneous selection of drought and low-N tolerant genotypes. Under drought, cultivars TZE-Y DT STR C4, TZE-W DT STR C4, and TZE Comp 3 DT C1F2 were outstanding and closest to the ideal cultivar. Seven cultivars were closest to the ideal under low-N, two of which were among the three selected under drought stress. Faster progress in selecting for improved grain yield is possible using EPP, EASP, PASP, and ASI under either drought or low-N. |
| format | Journal Article |
| id | CGSpace88147 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2011 |
| publishDateRange | 2011 |
| publishDateSort | 2011 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace881472024-08-27T10:35:49Z Relationships among traits of tropical early maize cultivars in contrasting environments Badu-Apraku, Baffour Akinwale, R.O. Ajala, S.O. Menkir, A. Fakorede, M.A.B. Oyekunle, M. maize striga hermonthica zea mays Secondary traits can improve precision with which drought or low soil nitrogen (low-N) tolerant maize (Zea mays L.) genotypes are identified, compared to measuring only grain yield under each stress. The objective of this study was to identify secondary traits for indirect selection for yield improvement under drought and/or low-N. Two sets of experiments were conducted at four locations in Nigeria for 2 yr. In the first experiment, cultivars were evaluated under low (30 kg ha−1) and high (90 kg ha−1) N and drought and well-watered environments in the second experiment. Most reliable traits for selection for yield under drought were ear aspect (EASP), plant aspect (PASP), anthesis-silking interval (ASI), and number of ears per plant (EPP). Days to anthesis (DYA) and silking (DYS) were the most reliable under well-watered environments. Under low-N, most reliable traits were DYA, DYS, stay green characteristic (LDTH), ASI, plant height (PLHT), EPP, EASP, and PASP whereas PLHT, EPP, PASP, and EASP were most reliable traits under high-N environments. The ASI, EPP, EASP, and PASP were identified as most reliable traits for simultaneous selection of drought and low-N tolerant genotypes. Under drought, cultivars TZE-Y DT STR C4, TZE-W DT STR C4, and TZE Comp 3 DT C1F2 were outstanding and closest to the ideal cultivar. Seven cultivars were closest to the ideal under low-N, two of which were among the three selected under drought stress. Faster progress in selecting for improved grain yield is possible using EPP, EASP, PASP, and ASI under either drought or low-N. 2011-05 2017-10-05T07:42:39Z 2017-10-05T07:42:39Z Journal Article https://hdl.handle.net/10568/88147 en Limited Access Wiley Badu-Apraku, B., Akinwale, R.O., Ajala, S.O., Menkir, A., Fakorede, M.A.B. & Oyekunle, M. (2011). Relationships among traits of tropical early maize cultivars in contrasting environments. Agronomy Journal, 103(3), 717-729. |
| spellingShingle | maize striga hermonthica zea mays Badu-Apraku, Baffour Akinwale, R.O. Ajala, S.O. Menkir, A. Fakorede, M.A.B. Oyekunle, M. Relationships among traits of tropical early maize cultivars in contrasting environments |
| title | Relationships among traits of tropical early maize cultivars in contrasting environments |
| title_full | Relationships among traits of tropical early maize cultivars in contrasting environments |
| title_fullStr | Relationships among traits of tropical early maize cultivars in contrasting environments |
| title_full_unstemmed | Relationships among traits of tropical early maize cultivars in contrasting environments |
| title_short | Relationships among traits of tropical early maize cultivars in contrasting environments |
| title_sort | relationships among traits of tropical early maize cultivars in contrasting environments |
| topic | maize striga hermonthica zea mays |
| url | https://hdl.handle.net/10568/88147 |
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