Protoporphyrinogen IX-oxidizing activities involved in the mode of action of a new compound N-[4-chloro-2-fluoro-5-{3-(2-fluorophenyl)-5-methyl-4,5-dihydroisoxazol-5-yl-methoxy}-phenyl]-3,4,5,6-tetrahydrophthalimide |
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| Authors: | In Taek Hwang Kyung Sik Hong Jung Sup Choi Hyoung Rae Kim Dong Ju Jeon Kwang Yun Cho |
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| Institution: | Korea Research Institute of Chemical Technology, Jang-dong 100, Yusong-ku P.O. Box 107, Taejon 305-606, Republic of Korea |
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| Abstract: | N-4-Chloro-2-fluoro-5-{3-(2-fluorophenyl)-5-methyl-4,5-dihydroisoxazol-5-yl-methoxy}-phenyl]-3,4,5,6-tetrahydrophthalimide (EK-5385) is an experimental substituted bicyclic herbicide. Soil-applied EK-5385 showed good rice selectivity and potent herbicidal activity on barnyardgrass (Echinochloa crus-galli var. oryzicola) at rates of 3.9-250 g a.i./ha. Barnyardgrass was exhibited normal growth under dark condition, however, the growth of shoot and root was severely inhibited under light condition (14/10 h of light/dark, 50 μmol/m2/s of photosynthetically active radiation) when treated with EK-5385, oxadiazon, and oxadiargyl. IC50 of EK-5385 and oxadiargyl to chlorophyll loss in cucumber cotyledons was approximately 0.3 and 0.7 μM, respectively. IC50 of EK-5385 and oxadiargyl to carotenoids loss in cucumber cotyledons was about 0.26 and 0.1 μM, respectively. IC50 concentration of EK-5385 and oxadiargyl on Protox activity was approximately 5.5 and 8 nM, respectively. Cellular leakage occurred without lag period from cucumber leaf squares treated with 1 μM of EK-5385 and oxadiargyl under light exposure. |
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| Keywords: | Carotenoids Chlorophyll Herbicidal activity Oxadiazon Oxadiargyl Protox Selectivity Substituted bicyclic herbicide |
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