Studies on the mechanism of radiosensitivity among soybean varieties

After exposing 13 soybean varieties to γ-ray, the height of seedling, the length of the first internode and the area of the first leaf were measured. The results showed that there were significant difference in radiosensitivity among soybean varieties. The unscheduled DNA synthesis (UDS) in soybean embryos irradiated or non-irradiated were studied with 3H-TdR incorporation during the early germination. The results showed that there was the unscheduled DNA synthesis during the early stage of soaking in irradiated seed and differences of radiosensitivities among soybean varieties were related to abilities of repair. The variety with high repair ability was radioresistant and the variety with low repair ability was radiosensitive