PHOTORESPIRATORY CO_2 RELEASE FROM L-[U-^<14>C]SERINE IN TOMATO LEAVES

概要

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^<14>CO_2 release from _L-[U-^14C]serine in the illuminated tomato leaf was investigated. Exogenously added [1-^<14>C]and [2-^<14>C]glycine were metabolized in the glycolate pathway and ^<14>CO_2 was evolved at a low CO_2 concentration from [2-^<14>C]glicine in a similar manner to that from _L-[U-^14C]serine (Yamauchi and Yamada, Soil Sci. Plant Nutr., 26, 191-204 (1980)). α-Hydroxy-2-pyridinemethanesulfonic acid and isonicotinic acid hydrazide increased the [^<14>C]glycolate and [^<14>C]glicine accumulations, respectively, in leaves fed _L-[U-^14C]serine at a low CO_2 concentration with a corresponding decrease in ^<14>CO_2 evolution. This may indicate that the carbon of serine was recycled back into the Calvin cycle and then incorporated into the glycolate pathway. the ^<14>CO_2 release from _L-[U-^14C]serine increased at high light intensity and high temperature. The contribution of CO_2 release from serine to photorespiration is discussed.
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