X線照射によるタバコの突然変異の研究

概要

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Dormant seeds of Nicotialca sylvestris (n=12) and N. tabacum (n=24, Bright Yellow and Dixie Bright 101) were subjected to X-ray treatments. In the first experiment (1950), the seeds of Bright Yellow were exposed to unfiltered radiation at 90 KVP, 3 mA, 15cm, of intensity of 216r/min for 10-60 minutes. The dosage applied ranged from 2,160 to 12, 960 r units. There were no striking differences in. the germination rate of seeds or in morphological characters of mature plants between untreated and variously irradiated plants. I. n the second experiment (1951-1953), the seeds of N. sylvestris and N. tabaculee were irradiated with harder X-rays at 180 KVP, 3 mA, without filter. The dosage was 5,000-50,000r. At more than 15,000r the irradiated seeds of N. sylvestris did not germljnate at all, and at 15, 000 r the germination rate was markedly reduced. Among N. tabacum varieties, Bright Yellow showed a higher tolerance against Xrays than Dixie Bright 101. The higher the dosage above 15. 000r the more delayed and uneven was the germination of treated seeds, as well as the growth of the seedlings. At the highest dosage, the germ-ination rate of the seeds was reduced, especially in Dixie Bright 101 (cf. Tab. 3).
日本育種学会の論文
1955-07-05