Genetic analysis of some quantitative traits in bread wheat across environments

摘要

Performance of eight bread wheat (Triticum?aestivum?L.) genotypes; namely, Wafaq-2001, Takbeer, Tatara, Iqbal-2000, Margalla-99, Ghaznavi-98, Khattakwal and Inqalab-91, were evaluated under three diverse environments (early, normal and late sown conditions) through an 8x8 diallel cross. Observations were recorded on days to heading, productive tillers plant-1, number of grains spike-1, 1000-grain weight and grain yield plant-1. Highly significant differences were observed among the genotypes for all traits. Analysis of genetic components revealed significant additive (D) and dominant (H) genetic variations for days to heading, productive tillers plant-1, number of grains spike-1, 1000-grain weight and grain yield plant-1?under early planting. Under normal planting both additive (D) and dominant (H) genetic components were significant for days to heading, productive tillers plant-1, grain yield plant-1?and 1000-grain weight. Similarly, under late planting significant additive (D) and dominant (H) genetic variations were observed for number of grains spike-1?and grain yield plant-1, while for 1000-grain weight only additive (D) genetic component was found significant. Genetic analyses of the traits confirm the involvement of both additive and non-additive gene effects in governing the inheritance.