방사선 처리에 의한 돌연변이육종 (突然變異育種) (2) X 선 및 열중성자가 배추와 무우 기건종자에 (氣乾種子) 미치는 영향 = BREEDING EXPERIMENT ON MUTATION INDUCTION BY IRRADIATION (2) - Effects of X - ray and Thermal Neutron Irradiation on Dry Seeds of Chinese Cabbage and Radish.

다국어 초록 (Multilingual Abstract)

Kim. Dawng Woo, Yang Choon Kim and Mi Kyung Cho(Horticultural Experiment Station, Seoul, Korea)-Breeding Experiment on Mutation Induction by Irradition. (2) Effects of X-ray and Thermal Neutron Irradiation on Dry seeds of Chinese cabbage and Radish. Kor. Jour. Bot. Vol. V. No. 1. p.1∼6. 1969 : With the aims to find the biological effects of X-ray and thermal neutron on dry seeds of Chinese cabbage and radish, and to examine the utility of artificial mutation in plant breeding, this experiment was carried out through the treated and next generation. The results obtained are summarized as follows: 1) Germination rate was rather irregular than decreasing as increasing dose of radiation and there were no differences between Kyong-Sam and Chyong-Bang of Chinese cabbage. 2) In R_l generation, abnormal leaves from seedling of irradiated seeds were observed. These were more apparent in X-ray irradiation than in thermal neutron. 3) Seedling height was inhibited with increasing dose of X-ray and thermal neutrons. Growth inhibition was more remarkable in X-ray than in thermal neutron. Kyong-Sam demonstrated more sensitivity than Chyong-Bang in both X-ray and thermal neutron. 4) Seedling height produced from seeds subjected to thermal neutrons showed small variation around its mean value, while in X-irradiation there was a greater deviation from the mean value. 5) Fertility was decreased as increasing with dose, while the frequency of abortive pollen was increased. There were variability of the fertility and frequency of abortive pollen among plants or branches of a plant. 6) The mutants were obtained more in thermal neutron irradiation than in X-ray. The types of mutations obtained in Chineae radish of R_2 generation were abnormal leaf, densely glowing leaf, degeneration in growing point and dwarf. The maximum frequency of phenotypic mutations was abnormal leaf mutation.