稻の一病原菌に於ける突然變異に就きて
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概要
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Recent publications indicate that asexual mutations in fungi occur frequently on culture media. In the present paper a distinct albino mutation by a species of Brachysporium parasitic on the rice-seedlings is reported. Brachysporium is a genus of Dematiaceae, and is characterized by dark brown mycelium and conidia. The parental form under consideration was isolated from an infected seedling of the rice plant in April, 1925. Cultures were started from single spores at that time. In October of the same year we found taht from the lower portion of theslant of the aoricot-decocition agar in a test tube, a sector grew out which lacked the usual color character. Subcultures were made from the contrasting area of this culture, by transferring some of the white myceliuim to other culture media. The conidia produced by this ablino strain correspond substantially in size and shape with those of the normal strain. Repeated single-spore isolations have been made, and these cultures remain all constant for the character of albinism, as do the cultures made by isolationg bits of myceliium. Effect of temperature on the growth of the mutant and also of the parental form has been studied. But we could not find any remarkable difference between them. The optimum temperature for the growth of them seems to lie at about 28℃. In order to ascertain whether there are any differences in degre of virulence of the mutant and its parent, comparative inoculation experiments were made on the rice seedlings. The results obtain d indicate however that they havealmost the same degree of virulence, In the present paper the results of our investigations on the effect of some environmental factors to the color modifications of the albino strain on the cuotures are also described.
- 日本植物病理学会の論文
- 1927-07-20
著者
関連論文
- Brachysporium屬菌による植物の疾病 (昭和八年四月總會講演要旨)
- 菌類に於ける突然變異的現象に關する實驗的研究 : (第二報) 稻胡麻葉枯病々原菌に於ける突然變異的現象に就きて
- 稻の一病原菌に於ける突然變異に就きて