Immediate mutagenic effects of 250Gy, 350Gy and 450Gy gamma rays were studied on four genotypes of aromatic rice, derived from two popular aromatic landraces of West Bengal, Gobindabhog and Tulaipanja. In general, germination percentage, root length, shoot length, seedling vigour index, plant height, spikelet number per panicle, spikelet fertility (%), grain yield per plant and survival at maturity decreased with increase in dose at variable rate due to negative effect of mutation. Panicle number was increased in all the irradiated population over control, which might be due to stimulatory effect of mutagen. Panicle length remained almost unaffected. The results indicated the differential sensitivity of the genotypes and characters to radiation treatment.
Induced mutagens, gamma rays, aromatic rice, M1 generation
