大豆品種間의 放射線感受性差에 關한 硏究

Studies on Radiosensitivity of Soybean Varieties

In order to determine differences of radiosensitivity of soybean varieties collected from Korea, U.S., Taiwan and Vietnam, dried seeds were irradiated with gamma-rays. The criteria. of radio-sensitivity were judged with seedling height and root length. 1. Varietal differences in radio-sensitivity were found and 50 per cent of growth retardations were observed from 10kR to 20kR; in seedling height and from 25kR to 35 kR in root length. Difference of growth retardation in root length was not found above 45 kR. 2. Dose-respons curves could be approximated by following general equation irrespective of the varietal sensitivity. l/lo=l-(l-e-KD)⁴. D is an experimental dose and K value is sensitivity constant. The radiosensitivity of a variety can be expressed only by the K value in the equation irrespective of dose used. 3. Positive correlation between seedling and root growth was shown in D_(50). By comparison degree of inhibition of seedling and root growth with that of average in control, It was indicated that two characters were same at low doses, while inhibition in seeedling growth was more severe than root growth at high closes. Therefore it was found that in soybean seedling height was more useful as a criterion for radio-sensitivity than root length.