Genetic analysis and diversity studies in pearl millet (Pennisetum glaucum (L.) R. Br.)
Abstract
Hundred pearl millet genotypes were evaluated to understand their diversity and association among the yield and yield attributing traits. The PCV was higher than the GCV for all the characters studied indicating the influence of environment in expression of characters. High heritability along with high genetic advance as per cent of mean was observed in single earhead weight, grain yield per earhead, 1000 seed weight, spike girth and days to 50 per cent flowering indicated that additive gene action for these characters. Single earhead weight, 1000 seed weight and days to 50 per cent flowering possessed high direct effect on grain yield. Hence, direct selection for these characters could be rewarding for the improvement of grain yield. The estimation of genetic divergence based on D2 value revealed that the 100 pearl millet genotypes can be grouped into 11 clusters. The distribution of genotypes into various clusters indicating the high divergence among the studied genotypes. The cluster VII had 41 genotypes followed by 28 genotypes in cluster III, 14 genotypes in cluster I and three genotypes in cluster XI. The highest inter cluster distance (39.0) was recorded between cluster VIII and cluster X. The genotypes, PT 2616 and PT 2656 had high mean value for plant height, spike length, 1000 seed weight, single earhead weight and grain yield / earhead.
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