Genetic analysis over environments in rice (Oryza Sativa L.) under temperate agroecology

摘要

Rice is one of the crucial staple food crops and holds two third of world population. In order improve its production and productivity a diallel study was carried out over two diverse environments in 2012 by generating 36 Flhybrids using 9 parents. Analysis of variance revealed significant differences among the genotypes together with significant G x E interaction for most of the characters studied. Estimates of C^g and O2's revealed that, the latter component of variance wasgreater in maginitude formost of the traits for pooled data obver environments. The maginitude oi o2D was higher than corresponding, O2 A indicating non-additive gene action was of greater importance. Significant and positive estimates of GCA over pooled data for grain yield/plant identified the parents, SKAU-389, Jhelum, SKAU-382, and SR-las promising. Likewise 15 potential hybrid combinations for grain yield/plant were observed on the basis of high and significant SCA effects. The hybrids, Jhelum x K-08-60, SKAU-389 x K-08-60, SR-1 x K-08-60, K-08-59 x PS-5 and China-988 * SR-1 were prospective combinations for grain yield/plant and other desirable characters. Results would indicate that the parental lines are genetically diverse and could contribute to the improvement of hybrid rice productivity.