GENETIC VARIATION IN LOCAL AMAN RICE GENOTYPES (Oryza saliva L.)

Abstract

The experiment was conducted with 34 local rice genotypes with one check varieties at the Sher-e-Bangla Agricultural University experimental field to study characterization and genetic diversity of 35 local rice genotypes and to find out the association among the genetic characteristics. Regarding mean performance, the genotype G4 took the longest period for first flowering is (115) followed by genotype 0-35 (114) and the genotype 0-12 had the minimum days for first flowering is (99). The highest number of tilled grain per panicle was recorded in genotype 0-10 was (144.33). The highest number of effective tiller (10.33) was recorded in genotype 0-IS. The highest 1000 grain weight (26.00) was recorded in the genotype 0-15. The highest grain yield per hill was produced by genotype 0-24 (35.90g). The highest &g was fbund for number of root hair (103415.40) and the lowest magnitude of &g was observed in number of primary branches per panicle (1.97). The highest a2p was found for number of root hair (109410.31) and the lowest magnitude of &p was observed in number of primary branches per panicle (2.61). High GCV and PCV for number of effective tiller, root weight, number of root hair and grain yield per hill (g) indicated that selection of these traits would be effective. Correlation of Grain yield per hill was found to be highly significant and positive for number of root hair, days to flowering and plant height at both genotypic and phenotypic level and negatively significant for number of secondary branches per panicle at both level. Significant positive correlation of grain yield per hill with number of root hair, days to flowering and plant height implied that selection for these characters would lead to simultaneous improvement of grain yield in rice. Days to flowering had maximum direct effect (0.719) on yield followed by number of effective tiller (0.635). number of unfilled grain per panicle (0.544). Genotypes were grouped into five different clusters. PCA showed the highest inter-cluster distance was observed between the cluster I!and V (46.71) followed by Ill and V (46.40) and IV and V (45.43). Genotypes from these three clusters may be involved in hybridization as wide genetic variations exist among the groups. Cluster IV exhibited the highest intra-cluster distance (38.36), while the lowest distance was observed in cluster V (23.09).