ASSESSING GENETIC ANALYSES AND PERFORMANCE OF F2 WHEAT (TRITICUM AESTIVUM L.) SEGREGATING POPULATION FOR VARIOUS YIELD AND ITS ASSOCIATED TRAITS
The research work was carried out to determine the heritability, genetic advance and performance for grain yield and various associated traits of six F2 bread wheat segregating population which include NIA Sunhari x Marvi, Marvi x CIM 24/87, NIA Amber x Marvi, NIA-10/8 x NIA Amber, TD-1 x Khirman, and CIM 24/87 x Bhittai. These crosses were originated from eight parental lines viz NIA Sunhari, Marvi, CIM 24/87, NIA Amber, NIA 10/8, T.D-1, Khirman and Bhittai. The trial was organized in three replications under Randomized Complete Block Design (RCB). The results regarding mean squares depicted that genotypes and parents were highly significant at P<0.01 for days to spike emergence, days to maturity, plant height, spike length, spikelets spike-1, spike yield, 100-grains weight, yield plant-1 and biological yield which showed that higher variation exist in both parents and F2 population for these traits. The non-significant differences were observed for grain spike-1 among genotypes and parents that indicated existence of narrow variability among parents and hybrid for this trait. Cross combinations of F2 population were strongly significant at P<0.01 for plant height, spikelets spike-1, 100- grain weight, grain yield and biological yield. Days to maturity, spike length and grains spike-1 showed significant differences at 0.05 probability level in hybrids. Days to 75% spike emergence and main spike yield showed non-significant effects. Grain yield results indicated that cross NIA Amber x Marvi produced higher yield (23.90 g), while minimum grain yield plant-1 was noted in parent TD-1 (15.54 g). The higher 100-grain weight plant-1 (4.79 g) was recorded in CIM 24/87, followed by variety TD-1 (4.77 g). The heritability estimates indicated that cross NIA-Sunhari x Marvi had highest heritability (91.68%), followed by cross NIA-Amber x Marvi (84.16%) for grain yield plant-1. Crosses Marvi x CIM 24/87 and CIM 24/87 x Bhittai showed highest heritability values for 100-grain weight (92.36, 61.53, respectively). Cross NIA-Amber x Marvi proved to be most effective cross combination for most of the traits.