Study of genetic parameters and genetic divergence for yield and yield components of bread wheat (Triticum aestivum L.)

Abstract

Thirty wheat genotypes were evaluated for eleven variability parameters. Significant genotypic differenceswere observed for all the traits studied indicating considerable amount of variation among genotypes for eachcharacter. The estimates of genotypic coefficient of variation (GCV) and phenotypic coefficient of variation(PCV) were high for grain yield per plant, harvest index, number of grains per spike, number of tiller per plantand weight per ear. The remaining traits exhibit moderate to low PCV and GCV estimates. High heritabilityestimates were recorded for all the traits studied. These all traits also indicate high expected genetic advanceexcept harvest index and number of grains per spike. Based on Euclidian dissimilarity distance, the clusteranalysis separated the 30 wheat genotypes into eight different clusters. Genetic diversity among 30 lines of breadwheat was studied for yield and its component traits using Mahalanobis D2 analysis. The distribution patternof genotypes in different clusters was random. The highest numbers of genotypes were founded in cluster IIIwhereas, cluster II and VIII were presented minimum number of genotypes. The highest intra cluster distancewas observed within cluster VIII indicate that genotype in this cluster were genetically more divergent theintra cluster distance with in cluster VIII and IV were observed. Highest inter cluster value observed betweencluster VII and III and the lowest inter cluster value observed in cluster between V and I.