The sensitivity of the fodder legume vigna marina (Burm.) Merr. to Physical and chemical mutagens were studied by treating dry seeds with gamma rays and presoaked ceads with EMS in M_{1} generation. The L*D_{60} for survival ranged between 60 to 60 krad of gamma rays and between 75 to 100 mM of EMS. The reduction in seedling height and fertility was proposinate to the increase in dosage in both the mutagens. The doses, where the inhibition of plumule length was 20 to 35 Per cent, were found to be an optimal for breeding purpuses. The use of 10 to 20 krad of gamma rays and a concen-tration less than 20 mM of EMS may be uptimal dose for this crop.
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