Abstract
1. 1. Compared with other species, plants which evolve little CO 2 in the light and fix CO 2 via the β-carboxylation pathway of photosynthesis have low glycolate oxidase and high phosphoenolpyruvate carboxylase activity. 2. 2. Glycolate oxidase activity in extracts of plants from both groups was not activated by light or by FMN but was stimulated by incubation with glycolate. Increased O 2 uptake in the presence of FMN and light was found in all extracts, but this was due to a photoreduction of the pigment with the production of peroxide which stimulated the non-enzymic release of 14CO 2 from labeled glycolate or glyoxylate. 3. 3. Glycolate-oxidase activity reflects an important difference in the pathways of carbon metabolism in the light in these two groups of plants. The data are consistent with the involvement of glycolate as a substrate for CO 2 production during photorespiration. 2-Carbon precursors of glycolate may be important intermediates in CO 2 fixation via the β-carboxylation pathway.
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