ダイコン畑から分離した Rhizoctonia solani Kuhn の新しい菌糸融合群 (第7群)

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Seven anastomosis groups, AG-1〜AG-6 and AG-BI of Rhizoctonia solani Kuhn [Thanatephorus cucumeris (Frank) Donk] are known in Japan. While grouping of R. solani mainly isolated from Japanese radish fields, it was found that 107 isolates composing a single anastomosis group did not anastomose with isolates of any known AG of R. solani. These isolates were obtained from the seedlings of Japanese radish, and the flax or buckwheat stems buried as a bait in the field soil. These isolates were obtained from Nara, Shiga, Tokushima and Kagawa Prefecture located in south-west part of Japan. The isolates were brown or dark brown colony with aerial hyphae and sclerotia, but without clear zonation. Optimum temperature for growth was 28-35 C and the linear growth was 25.5-27.0mm/24hr on PDA. The width of mature main hyphae was 7.80-8.27μm and the number of nuclei per cell was 3-11 (mean 5.6). The fungus was thiamine autotrophic. The pathogenicity to seedlings of Japanese radish, bean, cucumber, tomato, barley and rice was slight or negligible. Five, out of 20 tested isolates, formed the white and flake hymenia as solitary islands on the soil surface. Metabasidia were barrel-shaped, short clavate or cylindrical, 11.0-27.5×6.5-11.0μm. Sterigmata were horn-shaped, 5.0-18.0μm in length and (1-) 4 per metabasidium. Basidiospores were obovate to oblong-ellipsoid, hyaline, smooth, with an apiculus, 6.5-13.0×4.0-8.5μm. These morphological characters of the perfect stage show that the new AG is identified as T. cucumeris and we proposed to designate this group as AG-7 of R. solani.
日本植物病理学会の論文
1983-04-25

ダイコン畑から分離した Rhizoctonia solani Kuhn の新しい菌糸融合群 (第7群)

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