Analysis of genetic divergence in rice (Oryza sativa L.) germplasm

摘要

One hundred and fourteen rice genotypes were evaluated for 16 metric characters to quantify genetic djyasdtyexdstiiganong ten byushgM ahaibnobisD~2 statistic. The genotypes fell into 10 clusters. Maximum inter-cluster distance was observed between clusters V and X. Among the 16 quantitative characters studied, harvest index contributed maximum (26.42%) towards divergence followed by seed density (18.35%) and total number of tillers per plant (15.52%). Cluster X had maximum number of spikelets per panicle, panicle length, filled grains per panicle, plant yield and biological yield. Cluster III exhibited lowest means for plant height, days to 50% flowering, panicle length, 100-grain weight, germination per cent, seedling dry weight, seedling length and seedling vigour index. The genotypes from clusters III and X, which have high and low cluster means for the majority of the characters, are suggested as parents for hybridization. Geographical diversity did not relate to genetic diversity.