ジフェニルエーテル系除草剤 oxyfluorfenおよび Chlomethoxynil の数種植物間における選択性機構

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Selectivity mechanisms of diphenyl ether herbicide oxyfluorfen ((2-chloro-4-trifluoromethylphenyl)-3' -ethoxy-4'-nitrophenyl ether) and chlomethoxynil(2, 4-dichlorophenyl-3'-methoxy-4'-nitrophenyl ether) in rice (Oryza sativa L.), barnyardgrass (Echinochloa oryzicola Vasing.), sorghum (Sorghum bicolar Moench), corn (Zea mays L.), tomato (Lycopersicon esculentum Mill), cabbage (Brassica oleracea L.), radish (Raphanus sativus L.), cucumber (Cucumis sativus L.), and buckwheat (Fiagopyrum esculentum Moench) were studied. Oxyfluorfen showed higher herbicidal activity to the plants than chlomethoxynil, and the plants absorbed more of the former. However, they metabolized ^<14&g;C-chlomethoxynil more rapidly than ^<14>C-oxyfluorfen. This greater absorption and lower metabolism of oxyfluorfen by the plants are considered main factors of its higher phytotoxicity. In oxyfluorfen treatment, rice and corn were more tolerant and absorb d less of the herbicide than other plants. Tomato showed very severe damage and had the highest absorption rate. Degradation of ^<14>C-oxyfluorfen in the plants was very limited. Absorption of oxyfluorfen by the plants is thus possibly one factor of its selectivity. In chlomethoxynil treatment, rice and corn were more tolerant than other plants and showed the lowest absorption rate. Metabolism of ^<14>C-chlomethoxynil was greatest in rice plants. Rates of absorption and metabolic activity of chlomethoxynil in these plants are considered to relate to its selectivity.
日本雑草学会の論文
1991-09-02

ジフェニルエーテル系除草剤 oxyfluorfenおよび Chlomethoxynil の数種植物間における選択性機構

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