Inheritance of cold tolerance in rice at the germination stage.

摘要

Present study determined the inheritance and heritability of cold tolerance at the germination stage in crosses between seven rice genotypes by partial diallel crosses between them. Analysis of variance indicated that there were highly significant differences among the replications, genotypes, General Combining Ability (GCA) and Specific Combining Ability (SCA) for percentage of reduction in Radicle Length (RL), percentage of reduction in plumule length (PR) and percentage of reduction in germination measure at percentage (GP). For all of three traits the higher magnitude of the dominance variances showed that non-additive gene action was predominant to additive one. The perusal of GCA effects reveals that Deilamani was an ideal general combiner for all characters and this parent is superior variety for them, whereas Hassani was a good general combiner for PL and GP. The estimates of SCA effects of top ranking crosses indicated that Neda x Hassani could be regarded as the most desirable cross combination for all of three traits. In this cross significant negative SCA effect indicated, demonstrating the existence of heterosis for cold tolerance.