Author(s):

Mukul, Sandhya, Aradhana Singh, PK Singh and SP Singh

Abstract: An investigation was carried out with hundred genotypes of indigenous collection of rice, were tested for the presence of diversity on the basis yield and bacterial leaf blight resistance using Mahalanobis D­² statistics. ANOVA revealed the presence of considerable amount of variability among the genotypes. High estimates of genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were observed for area under disease progress curve followed by grain yield per plant and total spikelet per panicle. High heritability coupled with high genetic advance was recorded for total spikelets per panicle. On the basis of D­² values the genotype were grouped into clusters. Eleven clusters were formed using Tocher’s method. Cluster I, VII, V and IX were having 22, 17, 10 and 10 germplasm, respectively. The highest inter-cluster distance was found between cluster X and XI (458.41) whereas maximum distance intra-cluster distance was observed cluster IX (63.20) and cluster 1 sowing lowest intra-cluster distance (13.46) suggested a closer relationship and low degree of diversity among the genotypes. The maximum contribution towards divergence was accounted by plant 1000 grain weight (23.58%), grain yield per plant (22.9% ) and effective tiller per plant (17.74%) followed by spikelets per panicle, plant height, grain weight per panicle and days to 50 percent flowering. On the basis of the divergence study the germplasm could be selected from the most divergent clusters for hybridization and further selection programme.

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