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Abstract: Field studies were conducted at the Experimental Farm of Calcutta University during 2010 and 2011. Dry, uniform and healthy seeds of four extensively grown cultivars SW-22, GT-2, TKG-22 and DSS-9 of sesame were irradiated with different doses of gamma rays viz. 50, 100, 150, 200, 250, 300, and 450 Gy. M1 and M2 generation were raised during pre-kharif 2010 and prekharif 2011, respectively. In M2 generation, it had been observed that there was a gradual reduction in performance with the increase in doses for all the characters. Useful and viable macro-mutants were individually selected in all the treatment, maximum being at 250 and 300 Gy in M2 generation. The yield related macro mutants types like capsules length, no. of seeds capsule-1, no. of capsule plant-1 were identified. All individually selected plants will be carried forward further generation(s) for the confirmation of segregating loci.

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