Rate of Glycolate Formation During Photosynthesis at High pH

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Abstract
The products of C14O2 fixation by Chlamydomonas and Chlorella were studied under conditions most favorable for glycolate synthesis. The highest percentage of the C14 was incorporated into glycolate in the pH range of 8 to 9. After 1 to 2 minutes as much as 40% of the C14 was found in glycolate products and only a trace of C14 was present as phosphoglycerate. Below pH 8 the rate of photosynthesis was much faster, but only a small percent of the C14 was incorporated into glycolate in 1 or 2 minutes, while a high percent of the C14 accumulated in phosphoglycerate. C14 labeling of glycolate even at pH 8 or above did not occur at times shorter than 10 seconds. During the first seconds of photosynthesis, nearly all of the C14 was found in phosphoglycerate and sugar phosphates. Thus glycolate appears to be formed after the phosphate esters of the photosynthetic carbon cycle.

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