フェナジン-5N-モノオキシドのイネ葉呼吸 : 光合成酸化還元系に対する影響および葉上における光分解

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1. The effect of phenazine-5N-monooxide, effective disinfectant against leaf b1ight disease of rice Plant, upon the respiration and photosynthetic oxygen evolution of the rice leaf and photodegradation of the compound were investigated. 2. Phenazine-5N-monooxide did not give any influence upon the respiration and photosynthetic oxygen evolution of the detached whole leaves at the concentration of 2.5 μg/ml, which is more than a half inhibitory concentration for the causal bacterium. 3. Phenazine-5N-monooxide also did not give any influence upon either the respiration or photosynthetic oxygen evolution of the detached whole leaves when aqueous suspension at 200 ppm was sprayed to the potted plant, this amount being entirely enough to control the disease. 4. In the experimental run using s1ices of the plant leaves, the photosynthetic oxygen evo1ution was suppressed by the addition of phenazine, whereas phenazine-5N-monooxide did not give any marked inhibitory effect indicating that the introduction of N-oxide group masked the undesirable properties of the mother compound. The reductive cleavage of the N-oxide bond of phenazine-5N-monooxide by the thin s1ices of rice plant leaves or leaves homogenate was not observed. 5. Phenazine-5N-monooxide in the solution was gradua11y changed to unidentified photodegradated compounds having 1ower bio1igical activity by a non-biological photochemical reaction. 6. Unidentified photodegradated compound UP-1 isolated in crystals had m.p. 131℃ empirical formula C 12 H 8 N 20, and M. W. 197. It seemed an isomeric compound of phenazine-5N-monooxide.
日本植物病理学会の論文
1969-06-30

フェナジン-5N-モノオキシドのイネ葉呼吸 : 光合成酸化還元系に対する影響および葉上における光分解

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