Hierarchical Clustering, Association and Pedigree Analyses under Water Stress and Irrigated Environments in Wheat

摘要

Forty wheat varieties were evaluated under different moisture regimes to study water stress resilient genotypes with diversity, trait interrelationship and also looking for ancestral lines serving water stress tolerant genetic base of present day cultivars.The variety HS490 (4.80 g) exhibited the highest grain yield/plant under water stress environment followed by GW273 (4.26 g), DPW621-50 (4.18 g), Raj 3765 (4.07g), Raj 3777 (4.07 g) etc. Under water limited environment, the promising genotypes Raj3765, PBW373 and Raj 4037 were grouped in same cluster, while the genotypes viz. HS 490, GW 273 and WR 544 were observed diverse and may be picked as one of the parents for water use efficiency breeding programmes. Under water stress, the highest significant positive genotypic correlation coefficients with grain yield were depicted by biological yield followed by spikelets/spike (r = 0.69**) and spike length (r = 0.58**), respectively. Path analysis suggested that directional selection for spike length,tiller/m and biological yield in water stress, while in addition to these grains/spike and 1000 grain weight would be helpful for grain yield enhancement. In pedigree analysisof DBW16, Raj 3765, Raj 4037, WR544 etc. the ancestral lines HD 1962, E4870 and K65 were found as common while, for HS490 and PBW373 the parental lines Kalyansona and Bluebird were regarded as contributors for water stress resilience.