Genotype by environment effects and selection for drought tolerance in tropical maize. II. Three-mode pattern analysis.

Chapman, S.C. and Crossa, J. and Basford, K.E. and Kroonenberg, P.M. (1997) Genotype by environment effects and selection for drought tolerance in tropical maize. II. Three-mode pattern analysis. Euphytica, 95 (1). pp. 11-20.

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A selection programme was initiated to improve mid-late season drought resistance in 3 tropical maize populations, while maintaining grain yield (GY) potential. Selection involved maintaining a constant anthesis date (AD), shortening the anthesis-silking interval (ASI) and increasing ears/plant (EPP) under drought conditions. Three-mode (genotypes × environments × attributes (G × E × A)) pattern analysis, which consists of clustering and ordination, was used to collectively interpret these changes from 10 evaluation trials conducted in Mexico. Mixture maximum likelihood clustering identified 4 groups, suggesting performance changes with selection in the populations. Groups containing the advanced cycles of selection had higher yields in most environments, and had lower ASI and higher EPP, particularly in drought environments. Control entries with no selection for drought resistance remained grouped with the initial cycles of selection. A 3 × 2 × 3 (G × E × A) principal component model explained 70% of the variation. For the first environmental component, ASI was highly negatively correlated with GY and EPP, while AD was not correlated with the other traits. The second environmental component (explaining 10% of the variation) contrasted droughted and well-watered environments, and showed that EPP and GY were better indicators of the contrast (in terms of changes in population performance) than were AD or ASI. Three-mode analysis demonstrated that improvements with selection occurred in both droughted and well-watered environments.

Item Type: Article
Additional Information: The work of the third author was financially supported by the Netherlands Organisation for Scientific Research (NOW).
Uncontrolled Keywords: water stress, breeding, ordination, clustering, three-way analysis, Zea mays, corn
Author Affiliation: International Maize and Wheat Improvement Center (CIMMYT),México.
Subjects: Crop Improvement
Crop Improvement > Seed Technology
Divisions: Maize
Depositing User: Mr Arbind Seth
Date Deposited: 21 Nov 2012 11:04
Last Modified: 21 Nov 2012 11:04
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