The results of gamma irradiation of five varieties of green gram at 25 R have indicated that variation in mutagenic sensitivity exists among different varieties and doses in My generation. The variety PS. 7 was found to be more sensitive than the others. Significant differences were noticed between doses also. Genotypic differences were noticed in the expression of chlorophyll mutations in the Ma generation. The variety PS-7 which was highly radio-sensitive in My generation yielded the highest frequency of chlorophyllmutations in the Me than the other varieties studied.
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