Solanki, Y.P.S.Puneet Kumar2017-10-232017-10-232017http://krishikosh.egranth.ac.in/handle/1/5810033562The experiment was conducted with 60 genotypes of bread wheat. These genotypes were grown in RBD in three replications during Rabi 2016-17 at Research Area of Department of Genetics and Plant Breeding, CCS HAU, Hisar. To study the variability, genetic diversity, correlation and path analysis, data were recorded for yield and its component traits along with some seed vigour parameters viz., Days to 50% heading, days to anthesis, grain growth rate: 14, 21, 28 days (mg/gr/day), plant height (cm), number of effective tillers/meter, flag leaf length (cm), flag leaf width (cm), flag leaf area (cm2), spike length (cm), spikelets per spike, number of grains per spike, 1000 grain weight (g), grain yield per plot (g), biological yield/plot (g), harvest index (%), germination (%), seed density (g/cc), seedling length (cm), seedling dry weight (mg), vigour index-I, vigour index-II and dehydrogenase activity (OD/g/ml). The analysis of variance showed highly significant differences among the genotypes for all the traits indicating adequacy of material and the traits studied for further estimation of genetic variability parameters. High value of GCV and PCV was recorded for grain yield per plot, followed by biological yield and dehydrogenase activity, indicating greater amount of variability among the genotypes. Highest heritability was recorded for days to 50% heading, followed by seedling dry weight and days to anthesis. Highly significant and positive association was observed between grain yield and tillers per meter, plant height, number of grains per spike, spikelets per spike, flag leaf area, grain growth rate at 14, 21 and 28 days after anthesis, spike length, 1000 grains weight, biological yield and harvest index. Germination (%) was positively and significantly correlated with seedling length, vigour index-I, and vigour index-II. The high direct effects was recorded for biological yield, harvest index, flag leaf breadth, number of effective tillers per meter, vigour index-I, vigour index-II, dehydrogenase activity and 1000 grain weight, in order. Cluster analysis (Wards minimum) grouped 60 genotypes into 8 clusters with variable number of genotypes which further indicated the presence of considerable amount of genetic diversity in the material. The intracluster distance was recorded maximum for cluster VIII and inter-cluster distance was maximum between clusters III vs. VIII. Based on cluster mean, cluster III and IV were considered most desirable for selecting parents for carrying out hybridization programme in wheat crop.ennullThesis