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The present investigation was carried out at Sakha Agricultural Research Station during 2013/014 to 2015/016 seasons to estimate genetic variance components and type of gene action controlling earliness and yield components of five barley crosses. These crosses used six-population model to determine the intra - and inter-allelic gene interactions controlling the inheritance of earliness and yield traits in five crosses of barley. Mean effect was highly significant for all traits in all crosses. Dominance × dominance was greater in magnitude than other components in most studied traits, indicating that these traits were greatly affected by dominance and its non-allelic interactions. Significant and highly significant desirable percentages of heterosis relative to mid and better parent were exhibited for grain filling period in crosses no. 1, 3 and 5, plant height in crosses no. 1 and 5, no. of grains/spike in crosses no. 1 and 4, no. of spikes/plant in crosses no. 2, 3 and 4 and grain yield/plant in cross no. 4. Broad-sense heritability values were high in all crosses for all studied traits. Narrow-sense heritability and genetic advance ranged from low to medium in most cases due to the opposite directions of dominance and dominance x dominance effects. Generally, the most promising crosses were the two crosses 1 and 5 for earliness and crosses no. 2, 3 and 4 for grain yield found to be higher in magnitude, which had high genetic advance associated with high heritability and would be of interest in breeding programs for improving barley.

Genetic Analysis of Earliness and Yield Component Traits in Five Barley Crosses