CORRELATION, PATH ANALYSIS AND GENETIC DIVERSITY IN AMAN RICE (Oryza saliva L)

Abstract

The experiment was conducted with forty two genotypes of rice at the experimental farm of Sher-e-Bangla Agricultural University, l)haka during the period of JulyDecember. 2013 to estimate the genetic variability, correlation, path and diversity among the genotypes. The experiment was conducted using Randomized Complete Block Design with three replications. All the genotypes varied significantly with each other for all the studied characters indicated the presence of considerably variations among the genotypes studied. The PCV values were higher than the respective CCV values for all the characters under study except unfilled grains per panicle indicating that the characters were less influenced by the environment. Total tillers per plant effective tillers per plant tilled grains per panicle, unfilled grains per panicle and yield per plant showed high heritability along with high genetic advance as percentage of mean were normally more helpful in predicting the genetic gain under selection. From the correlation and path analysis it was revealed that total tillers per plant cflèctive tillers per plant and days to maturity showed significantly positive gcnotypic correlation with yield as well as employed positive direct effect on yield suggesting that the selection for these traits would helpful for the improvement of yield per plant. As PCA, D2 and clusters analysis the genotypes were grouped into five diflèrent clusters. Clusters IV had the maximum fourteen and cluster Ill had the minimum three genotypes. The highest inter-cluster distance was observed betwecn II and Ill and the lowest was observed between IV and V. The highest and lowest intra-cluster distance was observed in Ill and IV respectively. Genotypes included in cluster V were important for total tillers per plant, eflbctive tillers per plant days to 50% flowering and thousand grains weight cluster III were important for filled grains per panicle and unfilled grains per panicle. cluster IV were for plant height and yield per plant Considering the diversity pattern and other agronomic performances, the genotypes Special from AL-29. AL-36, PP.413(i). AL-17(iii)B, AL-17(iii). AL-17(ii)A. Special from-129, Special from 17(iv), AL44(i), AL-li, Special from AL-36(D). PP48. IR25B, Special from AL-33. 114-2513 (Tall), P-58 (ii) might be considered better parents for the future efficient hybridization programme.