Badu-Apraku, B. and Akinwale, R. O. and Franco, J. and Oyekunle, M. (2012) Assessment of reliability of secondary traits in selecting for improved grain yield in drought and low-nitrogen environments. Crop Science, 52 (5). pp. 2050-2062.
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Abstract
Grain yield of maize (Zea mays L.) has low heritability under low soil nitrogen (low-N) and drought, necessitating the use of secondary traits with strong associations with yield for selection. A base index involving anthesis-silking interval, plant and ear aspects, ears per plant, and stay green characteristic is used for selection for yield under drought and low-N stresses. Reports are contradictory on the reliability of stay green characteristic for selecting for yield under drought stress and ears per plant and anthesis-silking interval in selecting for low-N tolerance. Ninety extra-early inbreds were evaluated for 2 years at 3 locations in Nigeria under low-N and drought to confirm reliability of stay green characteristic for selecting for drought tolerance and ears per plant and anthesis-silking interval for low-N. Plant aspect, plant and ear heights were identified as the most reliable traits for simultaneous selection for yield under low- N and drought in the extra-early inbreds. Stay green characteristic was unreliable for selecting drought tolerant genotypes while ears per plant and anthesis-silking interval were not among the reliable traits for selecting low-N tolerant genotypes. Ear height, plant and ear aspects, and stay green characteristic were identified by both path–coefficient and GGE (genotype main effect plus genotype x environment) biplot analyses as reliable for selecting for low-N and ear aspect, plant height, and anthesis-silking interval for drought tolerance.
| Item Type: | Article |
|---|---|
| Additional Information: | We acknowledge with thanks the financial support of the Drought Tolerant Maize for Africa (DTMA) Project and the staff of the IITA Maize Improvement Program in Ibadan, Nigeria, for technical assistance. |
| Author Affiliation: | International Institute of Tropical Agriculture (UK) Limited, Carolyn House, 26 Dingwall Road, Croydon, CR9 3EE, UK. |
| Subjects: | Plant Production Crop Improvement |
| Divisions: | Other Crops |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 18 May 2012 10:25 |
| Last Modified: | 03 Jul 2013 05:23 |
| Official URL: | http://dx.doi.org/10.2135/cropsci2011.12.0629 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5491 |
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