Effects of Paraquat on carbon assimilation and transport by sugarcane leaves in white light and darkness

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Effects of the quaternary ammonium herbicide Paraquat (1,1'-dimethyl-4,4 -dipyridinium-bis-dimethyl sulfate) on ^<14>C assimilation and transport by sugarcane leaves were studied in white light and total darkness. Assimilation was almost totally repressed when Paraquat was administered prior to ^<14>CO_2. when applied immediately after ^<14>CO_2, the subsequent transport of labeled sucrose was partially inhibited in white light and severely inhibited in darkness. The translocation effect is tentatively attributed to a selective repression of dark transport operating in collaboration with light-mediated transport. Transient ^<14>C declined in sucrose and increased in hexose and raffinose among darkened and Paraquat-treated leaves. The chemical's activity is interpreted within the context of its known restriction of photosynthetic light reactions. A distinction is drawn between transport inhibition in darkness and published phytotoxic effects of Paraquat.
日本植物生理学会の論文