Mode of some of barley quantitative inheritance traits in normal irrigation and terminal drought stress conditions using generation mean analysis

In order to study of heritability and gene action of some of quantitative traits of barley in two conditions, normal irrigation and terminal drought, cross was conducted between two genotypes (EM 79-4×1-BC-80628). In this cross EM 79-4 parent was sensitive to drought and the 1-BC-80628 parent was tolerant to drought. The parents with F1, F2, BC1, and BC2 generations produced from crosses were evaluated on field conditions using RCBD with 3 replications. This experiment was carried out in field of cereal breeding unit of Karaj Seed and Plant Improvement Institute during 2005-6 and 2006-7. In this study plant height, spike length, grain yield in plant, weight of 1000 grain, harvest index, days to heading and days to physiological maturity were measured. Results indicated that mean of squares of generations for all the traits were significant therefore generation mean analysis for all traits was conducted. In normal irrigation conditions on heredity control for more traits except harvest index additive, dominance and epistasis effects were role, but in terminal drought conditions in heredity control for all traits additive, dominance and epistasis effects were rolled. The ranges of broad sense heritability on normal condition between 0.34 to 0.63 and narrow sense heritability between 0.25 to 0.53 but in terminal drought condition this ranges for broad and narrow sense heritability respectively between 0.48 to 0.77 and 0.29 to 0.62 were varied. Average numbers of gene in normal and terminal drought conditions were 1 to 7 and 1 to 3 genes respectively.