Abstract

                                Experiments were carried out with rice variety Co.37 to study effects of gamma Irradiation and EMS on germination, survival, pollen and seed fertility in M, generation. A progressive reduction in germination and survival was observed as the doses of gamma rays and EMS wore increased. The reduction in germination percentage was more following combination treatments than individual treatments and the maximum reduction (10.86%) was observed (40 Krad + 50mM). The lower concentrations of EMS did not affect the survival of seedlings and the reduction in survival percentage was more due to gamma Irradiation and combination treatments than EMS. For the combination treatments, the effect was additive on germination and survival, Pollen and seed fertility was markedly reduced in gamma ray treatments compared to the EMS treatments. The combination treatments produced additive effect on pollen and seed fertility in My generation.

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