土壌中におけるペンタクロルニトロベンゼンの微生物変換

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Pentachloronitrobenzene (PCNB) has been widely used as a soil fungicide, especially for the control of diseases caused by Rhizoctonia solani and Plasmodiophora brassicae. There are several reports on biological degradation of PCNB. Chacko et al^<1)> found that PCNB was degraded to pentachloroaniline (PCA) by several soil microorganisms. Ko and Farley^<3)> reported the conversion of PCNB to PCA in soil, and the comparative effects of these two compounds on soil microorganisms with reference to its persistence in soil. Gorbach and Wagner^<2)> investigated PCNB residues in potatoes grown in PCNB-treated soil, and detected PCA and a unidentified metabolite in the peel. Kuchar et al^<4)> detected PCA and pentachlorothioanisole (PCTA) in young corn, soybean, and cotton plants grown in soil treated with PCNB. Previously, the author^<5)> reported that PCNB was metabolized to less toxic substance, PCA and PCTA by several phytopathogenic fungi in culture, and both selective uptake and metabolism of PCNB were important in its selective action against phytopathogenic fungi. PCNB supresses the growth of the pathogens fungistatically, but do not eradicate them in soil. Therefore, the pathogens may recover their mycelial growth in proportion to the decrease of PCNB in soil. From these characteristics, metabolism of PCNB may be a main factor to influence the persistence of its controlling effect in soil. This investigation concerns with metabolism of PCNB in natural soil and the soil artificially infested with several soil-borne pathogens.
日本植物病理学会の論文
1972-07-01

土壌中におけるペンタクロルニトロベンゼンの微生物変換

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