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GrainGenes Reference Report: RFM-27-191

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Reference	RFM-27-191
Title	Efficiency of indirect selection in wheat breeding for water stress and non-water stress environments
Journal	Revista Fitotecnia Mexicana
Year	2004
Volume	27
Pages	191-199
Author	Martinez-Rueda CG Lopez-Castaneda C
Abstract	In the breeding of plants for drought environments, it must be decided whether to select directly in the presence of water stress or indirectly in optimum environments. The relative effectiveness of these two strategies depends upon the expectation of genetic parameters determining the selection response and genetic correlations between yield under stress and non-stress environments. The objective of this study was to compare six environments with different moisture regimes based on the estimation of genetic variance and heritability of grain yield, for two groups of 25 M6 inbred lines of wheat in water stress and non-water stress environments. Both groups were tested in contrasting rainfed environments at Montecillo and Tecamac, Edo. de Mexico and under drought and irrigated environments at Tlaltizapan, Morelos and Montecillo, Edo. de Mexico during 1992-93. Grain yield and genetic variance and heritability estimates in both groups of lines were reduced as water stress increased. Estimates of relative expected indirect selection over direct selection indicated that selection and evaluation in the same environment would result in greater yield gains under water stress or non-water stress environments. The relative magnitude of heritability in stressed and non-stressed environments is not sufficient to choose the optimum environment for selection, due to the phenotypic differences that can be of opposite sign in different environments
Keyword	[ Hide all but 1 of 16 ] crop yield drought environment genetic correlation genetic parameters genetic variance genetic variation genotype environment interaction heritability inbred line indirect selection phenotypic variation plant water relations selection stress water stress

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