CHARACTERIZATION AND GENETIC DIVERSITY ANALYSIS IN RICE (Ocvza saliva L.)

Abstract

.A held experiment was conducted with 36 rice genotypes at the experirneinal farm of Sher-e-I3angla Agricultural University. Dhaka to study the characterization and genetic diversity analysis in rice (O;y:a saliva I..) during November 2005 to May 2006. Signihicant variation was observed among all the genotypes for all the characters studied. Considering genetic parameters high genotypic coefficient of variatioli (GCV) was observed for spikelet sterility % followed by eflèctive tillers per plant, total tillers per plant and grain yield per plant, whereas days to 50% flowering showed very low GCV. High heritzthility with low genetic advance in percent of mean was observed for days to 50% flowering which indicated that non-additive gene effects were involved for the expression of this character and selection for such trait may not be rewarding. High heritability with moderate genetic advance in percent of mean \vas observed lix plant height indicated that this trait was tinder additive gene control and selection for genetic improvement for this trait would he eilèctive. Ditièrent multivariate analysis techniques were used to classift 36 rice genotypes. All the genotypes were grouped into live clusters. Principal component analysis, principal coordinate analysis, canonical variate analysis gave similar result. Cluster I had maximum (12) and both cluster Ill & IV had mini num (2) number of genolypes. The highest intra-cluster distance was found in cluster 1 and the lowest in cluster IV among five clusters. The highest inter-cluster distance was observed hetwcen cluster I and IV and the locst between cluster II and III. The characters- effective tillers per plant. 1000-grain weight and harvest index contributed maximum towards divergence among the rice genotypes. Considering genetic diversity and other agronomic performance the genotypes (110. 023 and (336 from cluster 1 (312. GIG and 033 li'oni cluster Il: 031 from cluster Ill and 021. 022 from cluster IV niktht be selected as gmn .