Author(s):

M Venkatesan and KR Saravanan

Abstract: Mutation breeding in crop plants is an effective approach in improvement of crop having narrow genetic base such as Bhendi (or) Okra (<em>Abelmoschusesculentus</em> (L) Moench). The main objective of the present study to determine the effect of different concentrations of ethyl methane sulphonate (EMS) and colchicine on Mahyco hybrid and TCR2086 varieties of bhendi. The observations were recorded in M₂generations on different morphology and yield characteristics. The PCV and GCV were more for number of branches per plant, number of nodes per plant, fruit girth, fruit weight and fruit yield per plant indicating the release of micro mutations for these characters in two varieties. However the PCV and GCV were low for plant height and fruit length indicating low frequency of micro mutation for those character in two varieties. Moderate to high heritability was observed for characters such as plant height number of nodes per plant, fruit girth and fruit yield. This indicated that the induced variability for these characters were characters were less influenced by the environment. High heritability coupled with high genetic advance for fruit yield was observed in 0.4 per cent colchicine treatment in Mahyco hybrid and 1.2 per cent EMS treatment in TCR 2086. This indicated that the variability induced by these treatment in these variety is highly heritable and additive in nature and hence selection will be effective.

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