Genetic analysis of carbon isotope discrimination and agronomic characters in a bread wheat cross |
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Authors: | B. Ehdaie J. G. Waines |
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Affiliation: | (1) Department of Botany and Plant Sciences, University of California, 92521-0124 Riverside, CA, USA |
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Abstract: | Carbon isotope discrimination () has been suggested as a selection criterion to improve transpiration efficiency (W) in bread wheat (Triticum aestivum L.). Cultivars Chinese Spring with low A (high W) and Yecora Rojo with high (low W) were crossed to develop F1, F2, BC1, and BC2 populations for genetic analysis of and other agronomic characters under well-watered (wet) and water-stressed (dry) field conditions. Significant variation was observed among the generations for only under the wet environment. Generation x irrigation interactions were not significant for . Generation means analysis indicated that additive gene action is of primary importance in the expression of under nonstress conditions. Dominance gene action was also detected for , and the direction of dominance was toward higher values of . The broad-sense and the narrow-sense heritabilities for were 61 % and 57% under the wet conditions, but were 48% and 12% under the draughted conditions, respectively. The narrow-sense heritabilities for grain yield, above-ground dry matter, and harvest index were 36%, 39%, and 60% under the wet conditions and 21%, 44%, and 20% under dry conditions, respectively. The significant additive genetic variation and moderate estimate of the narrow-sense heritability observed for indicated that selection under wet environments should be effective in changing in spring bread wheat. |
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Keywords: | Triticum aestivum L. Drought resistance Generation means analysis Transpiration efficiency Gene action Heritability |
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