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Journal of Biological Sciences
  Year: 2008 | Volume: 8 | Issue: 3 | Page No.: 598-603
DOI: 10.3923/jbs.2008.598.603
Detection of Epistasis and Estimation of Additive and Dominance Components of Genetic Variation for Drought Tolerance in Durum Wheat
E. Farshadfar, S. Mahjouri and M. Aghaee

Abstract:
In order to detect gene action and epistatic effects for drought tolerance indicators, 22 diverse genotypes of durum wheat were used in a randomized complete block design with three replications under rainfed and irrigated conditions in the Agricultural Research Center of Kermanshah, Iran. Analysis of variance revealed enough genetic variation and possibility of selection between genotypes. Mean comparison, using Duncan multiple range test, indicated that genotypes 12, 13 and 21 were suitable in drought conditions. In three-dimensional plot, based on STI index, genotype 21 was grouped as a one cluster. Triple test cross analysis indicated epistatic effects for heading date, ruin irritability and proline content in the rainfed condition. Both additive and non-additive gene actions were significant for grain yield, proline content and ruin irritability in the water stress condition. For these traits, selection in segregating generations and hybridization breeding methods were offered. Only additive gene action was predominant for heading date in the rainfed condition. Thus, selection in early segregated generations and massive selection are considered. Higher D than H for all characters was showing incomplete dominance. Correlation coefficient(r) between sums and differences of lines were non-significant, indicating ambidirectional nature of dominant genes between lines.
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How to cite this article:

E. Farshadfar, S. Mahjouri and M. Aghaee, 2008. Detection of Epistasis and Estimation of Additive and Dominance Components of Genetic Variation for Drought Tolerance in Durum Wheat. Journal of Biological Sciences, 8: 598-603.

DOI: 10.3923/jbs.2008.598.603

URL: https://scialert.net/abstract/?doi=jbs.2008.598.603

 
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