Abstract
Aminoacetonitrile (AAN), a specific inhibitor of glycine oxidation in the photorespiratory glycolate pathway, did not inhibit photosynthetic CO2 fixation, but inhibited the apparent photosynthesis of rice leaves under high photosynthetic conditions. However, under such low photosynthetic conditions as low light intensity or senescent leaves, the apparent photosynthesis was not inhibited by AAN. The application of AAN to the leaves led to a greater accumulation of glycine under a high photosynthetic condition like strong light intensity.From these results, it can be postulated that the inhibition of apparent photosynthesis by AAN was due to the accumulation of intermediate metabolites in the photorespiratory glycolate pathway which was induced by AAN treatment.
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