The present investigation was undertaken with 107 elite rice genotypes to study the variability, heritability and genetic advance as per cent of mean for yield and yield component traits. In addition, character association between the yield and yield components and their direct and indirect effects on grain yield were also studied. High PCV and GCV were recorded for ear bearing tillers per plant, while high heritability were recorded for all the traits studied. Further, the high genetic advance as per cent of mean was recorded for plant height, the number of ear bearing tillers per plant, the total number of grains per panicle, test weight and grain yield per plant. Among these, ear bearing tillers per plant had recorded a high variability, heritability and genetic advance as per cent of mean in addition to correlation and direct effects with grain yield per plant indicating its effectiveness as important selection criterion for the yield improvement.

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The present investigation was carried out to study the inherent genetic diversity of 107 rice genotypes towards development of rice varieties with tolerance for germination under anaerobic conditions for use in wet direct seeded rice cultivation system. The diversity was evaluated using multivariate analysis technique of Mahalanobis D2. The 107 rice genotypes studied were grouped into nine clusters. Twenty nine genotypes were grouped in cluster II followed by 27, 22, 10, 11 and 5 genotypes each in clusters I, III, IV, VI and cluster VII, respectively. The pattern of distribution of genotypes into various clusters was observed to be at random with no relation to geographical diversity. Results on inter-cluster distances revealed maximum diversity between genotypes of cluster VII and cluster IX, while intra-cluster distance was noticed to be maximum for cluster VI. Cluster IX had recorded higher cluster mean values for all the traits studied. Further, the traits, namely, shoot length, seedling dry weight and anaerobic response index together accounted for 62.45 per cent of the total genetic divergence in this study.

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