Effects of temperature on glycolate metabolism in Chlorella

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The effect of temperature on the products of photosynthetic carbon metabolism was studied in Chlorella vulgaris 11h cells which had been grown with air enriched with 2-3%. CO_2. During the test period, 300 ppm of ^<14>CO_2 was used. On raising the temperature from 20 to 36℃ during photosynthetic ^<14>CO_2 fixation, ^<14>CO_2-incorporation into glycolate immediately stopped whereas that into sucrose was greatly enhanced. When the temperature was lowered from 36 to 20℃, ^<14>C-glycolate formation was greatly enhanced, but sucrose formation slowed. No significant change in the rate of total ^<14>CO_2 fixation was induced by either temperature change. At 20℃ the radioactivity incorporated into glycolate was about 20% of the total ^<14>C fixed, but it decreased to less than 2% at 32℃. When α-hydroxy-2-pyridinemethane-sulfonate was added, the percent incorporation of ^<14>C into glycolate was enhanced to 30% at 20℃ as well as at 32℃. The increase in ^<14>C-incorporation into glycolate was accompanied by a decrease in sucrose and glucose-polymer, although the total ^<14>CO_2 fixation was not significantly affected by this inhibitor; most of the labelled glycolate appeared in the algal medium.
日本植物生理学会の論文