The LD50 for seeds was determined at 0.19 kGy, and 0.3 kGy was found to be
lethal. Seeds irradiated with low doses germinated earlier as compared to those which received higher
doses of irradiation. The LD50 for surviving bud woods grafted on the rootstocks in the nursery was
determined at 60 Gy. There was constant and continuous reduction in the survival rates of buds as the
doses increased. The bud woods of guava Cv. Safeda were more radiosensitive than seeds of the same
cultivar. The most favourable doses were established between 0.15 and 0.2 KGy and led to mutations
such as: highest number of fruits (40), highest fruit size (59mm) and highest fruit weight of (128.38g).
The highest number of seeds (300) and 100 seed-weight (2.29g) were recorded at 0.05KGy while the
lowest number of seeds (167) and the lowest 100 seed-weight of 1.56g was observed in the 0.30KGy
treatments.