Mutation-induced polygenic variability and early prediction of high yielding mutants in greengram [Vigna radiata (L.) wilczek]

Three does each of gamma rays (200, 400 and 600Gy), ethyl methane sulphonate (0.2, 0.4 and 0.6%), nitrosoguanidine (0.005, 0.010, and 0.015%), maleic hydrazide (0.01, 0.02 and 0.03%) and in combination were administered to the seeds of two greengram varieties, Sujata and OBGG-52. In M2 generation, population mean got decrease with increase in variance for all the four traits studied and the magnitude of such changes varied with mutagens, their doses and the variety. Higher the dose of treatment greater the shift in mean and variance. The negative shift of mean was more pronounced in MH and its combined treatments in both the varieties.