Genetic divergence for yield contributing characters in F5 families of rice (Oryza sativa L.)

Abstract

Twenty-one different F5 families derived from eight different crosses involving seven improved parental genotypes of West Bengal were studied for genetic diversity on the basis of yield and its attributing characters. Based on D2 analysis, the 21 families were grouped into 8 clusters. Cluster I consisted maximum of 6 families followed by Cluster II with 4 families. Wilk’s Lambda criterion = 0.7 × 10-7 and V=716.42 with 240 df revealed a highly significant difference among the genotypes for the pooled effects of all the characters. The clusters VII and VIII were mono-familial although there was a common parent. The maximum inter-cluster distance was found between cluster III and IV. Relative contribution of 100-grain weight to the total divergence was highest, followed by plant height, days to 50% flowering and straw yield.

Keywords

• rice
• genetic diversity and d2 analysis