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전재철,마상용 ( Jae Chul Chun,Sang Yong Ma ) 한국환경농학회 1994 한국환경농학회지 Vol.13 No.3
Mode of safening action of N-(4-chlorophenyl)maleimide (CPMI) on metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-l-methylethyl) acetamide] was investigated in sorghum(Sorghum bicolor L.). CPMI was synthesized by dehydration of N-(4-chlorophenyl)maleamic acid(CPMA) which was obtained from amination with maleic anhydride and 4-chloroaniline. Melting points of CPMA and CPMI (>95% purity) were 200-202℃ and 116-118℃, respectively. Growth response study indicated that seed treatment of CPMI increased tolerance of sorghum shoot to metolachlor approximately threefold. Sorghum shoot was more sensitive to injury caused by metolachlor and CPMI activity than the root. Metolachlor was initially absorbed by sorghum shoot and metabolized to the metolachlor-glutathione conjugate in CPMI-untreated and treated shoots. However, CPMI treatment significantly accelerated metabolism of [^(14)C] metolachlor in sorghum shoot, resulting in decrease in metolachlor content and increase in formation of the glutathione conjugate. It was concluded that the protection against metolachlor injury conferred by CPMI appeared to be correlated to detoxification of metolachlor in sorghum shoot tissue.
전재철,마상용 ( Jae Chul Chun,Sang Yong Ma ) 한국환경농학회 1995 한국환경농학회지 Vol.14 No.3
The effect of N-(4-chlorophenyl) maleimide(CPMI), plant growth regulators, and alkylating agents on gluathione(GSH) content and glutathione S-transferase(GST) activity was examined with 3-day-old etiolated sorghum(Sorghum bicolor [L.] Moench) seedlings. The GSH content and GST activity of untreated seedlings were higher in shoots than that in roots. Response of GST activity in coleoptile was significantly greater than in other tissues of sorghum seedling. In CPMI-treated seedlings, GSH content was not significantly different from that in untreated seedlings. CPM treatment resulted in 2.3-fold increase in GST activity measured with metolachlor as substrate in the coleoptile region. In contrast, change in GST activity measured with metolachlor as substrate in the coleoptile region. In contrast, change in GST activity measured with 1-chloro-2,4-dinitrobenzene did not occur. The increase of GST activity was caused by induction of a GST isozyme, which is substrate-specific to metolachlor. Subsequently, two hypotheses related to metolachlor detoxification were evaluated on the basis of regulation of plant growth regulators and substrate induction of GST activity. In coleoptile, GST activity measured with metolachior was increased to 2.1-and 3.4-fold by both 2,4-dichlorophenoxyacetic acid(2,4-D) and metolachlor treated at the germination stage of sorghum, respectively. Treatments of 2.4-D and metolachlor also induced isozymes exhibiting the activity toward metolachlor. One of the isozymes was co-eluted with that induced by CPMI. These results indicated that increase in GST activity by CPMI may be partially related to auxin regulation and substrate induction.
벼에 있어서 bensulfuron - methyl 의 흡수 이행에 미치는 무기영양분과 혼합제초제의 영향
전재철,한강완 ( Jae Chul Chun,Kang Wan Han ) 한국환경농학회 1994 한국환경농학회지 Vol.13 No.1
Absorption and translocation of bensulfuron-methyl {methyl 2[[[[[(4,6-dimethoxy-2-pyrimidinyl) amino]carbonyl]amino]sulfonyl]methyl]benzoate} in rice (Oryza sativa L.) as affected by mineral nutrients and mixed herbicides were determined using the ^(14)C-labeled herbicide in culture solution. Absorption of ^(14)C-bensulfuron-methyl by the root decreased with increasing concentration of bensulfuron-methyl. However, increase in the application concentration did not affect movement of the ^(14)C to the shoot. There was no difference in total amount of ^(14)C-bensulfuron-methyl taken up between absorption periods of 12 and 48 hours, whereas ^(14)C-bensulfuron-methyl translocated to the shoot increased with increasing the absorption period. When bensulfuron-methyl mixtures were applied, butachlor [N-(butoxymethyl)-2-chloro-N-(2`,6`-diethylphenyl)acetamide] did not affect absorption and translocation of ^(14)C-bensulfuron-methyl. However, quinclorac (3,7-dichloro-8-quinoline carboxylic acid) mixed at a high concentration resulted in decrease in absorption and translocation of ^(14)C-bensulfuron-methyl. Nutritional disorder such as deficient or excess supply of mineral nutrients caused to inhibit absorption of ^(14)C-bensulfuron-methyl. The greatest decrease and delay of ^(14)C-bensulfuron-methyl absorption and/or translocation occurred in N-deficient and S-excess supply conditions.