植物における放射線生物学的研究〔英文〕-2-

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(1) For the study of the radiosensitivity of pollen grains of higher plants, the following four species were used: Narcissus Tazetta var. chinensis, Eriobotrya japonica, Lycopersicum pimpinellifolium and Torenia Founieri.(2) Pollen grains from all four species germinated normally and the pollen tube growth was as good as that of the controls at 1×105r X-ray irradiation. At 2×105r to 4×105r irradiation, the pollen germination percentage was significantly decreased and most of the grains failed to germinate at 5×105r exposure.(3) It could be noted that dusting with irradiated pollen grains of L. pimpinellifolium showed a gradual decrease in the percentage of fruits produced according to the increase of X-ray dosage, ranging from 2.4×104r to 2×105r. At the dosage of 1.5× 105r no fruit developed, although pollen germination and pollen tube growth were as good as in the controls. Fruits developed following hand pollination with irradiated pollen grains were very small and contained a few or no mature seeds, while the controls had 21 seeds per fruit.
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