北海道北見地方に存在するインゲン根腐病の発病抑止型土壌

概要

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Common root rot of beans has never been observed in a certain area of Tokoro County, Kitami, Hokkaido. Disease suppressiveness of the soil collected from the area (K-soil, from Kitami; volcanic, black-colored, loam) was compared with that of the known conducive soil from Tokachi (T-soil; volcanic, red-to brown-colored, loamy sand). The root rot of beans in the soil sartificially inoculated with macroconidia of Fusarium solani f. sp. phaseoli was scarce in untreated K-soil, while the disease in autoclaved K-soil was so severe as T-soil. However the disease suppressiveness of autoclaved K-soil recovered when it was maintained for several months in a greenhouse. The population of propagules in untreated K-soil inoculated with macroconidia, estimated by soil dilution plate method, decreased rapidly and became ca.1/1000 of the original population after 65 days. By soil smear method and cellophane method, few of macroconidia germinated in K-soil, and their tip cells or very short germ-tubes abnormally swelled and some of them lost their cytoplasm within 48 hr. Most of macroconidia inoculated in this soil finally lysed without chlamydospore production. The germination of inoculated chlamydospores was also inhibited at the laimo-sphere of detached bean hypocotyles in K-soil. These results suggest that Kitami soil is one of the suppressive soils in which the pathogen fails to establish.
日本植物病理学会の論文
1979-12-26