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To investigate sensitivity of deciduous rhododendrons to gamma rays, seeds of 3 different species were irradiated with various doses of gamma rays. Germination percent of non-irradiated seeds was about 96% in Rhododendron mucronulatum, which they were confirmed non-dormant seeds. In irradiation wit...

To investigate sensitivity of deciduous rhododendrons to gamma rays, seeds of 3 different species were irradiated with various doses of gamma rays. Germination percent of non-irradiated seeds was about 96% in Rhododendron mucronulatum, which they were confirmed non-dormant seeds. In irradiation with 100 ㏉ of gamma rays, germination percent was more than 90%. However, germination percent irradiated with 200 ㏉ over was drastically decreased. Seeds irradiated with 400 ㏉ of gamma rays were not germinated at all. Lethal dose (LD_(50)) of seeds was identified as 100-200 ㏉. Days to germination of seeds was 10, and expanded day of cotyledon was about 5 after germination. Flower color of wild rhododendron collected in Buyeo was whitish pink, and the percent germination of harvested seeds was 22.7%. The percent germination of seeds irradiated with 100 and 200 ㏉ of gamma rays was still higher than that of nonirradiated seeds. LD_(50) of seeds collected in Buyeo was about 300 ㏉. The colors of seed coat in two wild R. mucronulatum for albiflorum collected. But difference of germination rates according to testa color was not observed. The percent germination of these seeds was more than 90%. Regardless of this difference in testa color, germination period and cotyledone expanding days were similar to R. mucronulatum. In seeds irradiated with 20 ㏉, percent germination (95.6%) was higher than that (90%) of non-irradiated seeds. However, germination percent of seeds irradiated with 80 ㏉ over was very low, expanded cotyledone about 10% among germinated seeds. LD_(50) of seeds was 60-80 ㏉.