Genetic variation has led to an increase in the quantitative traits of crops. The variability on genome is induced by mutation, which enhances the productivity. We evaluated variability on quantitative characters such as, plant height, number of branches/plant, number of leaves/plant, number of fruit clusters/plant, number of pods/plant, number of seeds/pod, yield/plant and 100 seed weight of black gram in M2 generation by the effect of mutation by gamma rays. The results were shown high genetic variability, heritability and genetic advance with significant enhancement (P 0.05 and P 0.01) in growth and yield traits. Hence selection is effective for these traits could be possible through gamma rays. The speculation of effects of gamma rays on genome is that irradiation, induced addition, deletion in DNA pairs and also attributed large chromosomal rearrangement. The result were shown significant enhancement in yield and related traits. It indicates that improvement in quantitative traits would be possible through gamma rays.
Key words: Genetic variability, gamma rays, quantitative traits, black gram.
RBD, Randomized complete block design; PCV, phenotypic coefficient of variation; GCV, genotypic coefficient of variation; h2, heritability; GA, genetic advance; EMS, ethyl methane sulphonate
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