植物における放射線生物学的研究〔英文〕-8-

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1. Diploid oats of an early mutant strain was grown for some generations in granite sand supplied with Kasais nutrient solution or with that lacking phosphate. The latter showed typical symptoms of P-deficiency or inhibition of plant growth. However, no evident effect of P-deficiency was found on chromosomal abnormalities or gene mutations.2. When young panicles of these P-deficient plants were irradiated with 250r of X-rays, the panicles in the full growth were apparently shorter than those of the plants which were not irradiated. Also a slight increase in the frequency of chromosome aberrations in the pollen mother cells of P-deficient plants was observed.3. Dry seeds obtained from P-deficient plants were irradiated with 10-70kr of X-rays. No seedling could come out of sand by irradiation with a dose of 40kr or more. In 16 day old seedlings, P-deficient ones showed a higher radiosensitivity than the controls at the dose of 30kr, as indicated by the reduced survival rate and plant height in the former. A slight increase in mutation rate was found in the X2 progenies of P-deficient plants though it was not statistically significant.
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