Rate of Oxalate Biosynthesis from Glycolate and Ascorbic Acid in Spinach Leaves

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The contribution of glycolate as a precursor of oxalate in newly expanding spinach leaves was compared with that of _L-ascorbic acid (ASA). Detached spinach leaves were fed with [2-^<14>C]glycolate and [1-^<14>C]ASA. Using the values of the rate of photorespiratory glycolate synthesis and the incorporation of glycolate-^<14>C into oxalate, the rate of oxalate biosynthesis via glycolate amounted to 34 μg g^<-1> fr wt h^<-1> under light conditions. When the values of incorporation of ASA-^<14>C into oxalate and the turnover rate of ASA were used, the rate of oxalate biosynthesis via ASA in light and darkness, amounted to 1.6 and 2.9 μg g^<-1> fr wt h^<-1> under light conditions. When the values of incorporation of ASA-^<14>C into oxalate and the turnover rate of ASA were used, the rate of oxalate biosynthesis via ASA in light and darkness, amounted to 1.6 and 2.9 μg g^<-1> fr wt h^<-1>, respectively. Glycolate was found to be more efficient as a precursor of oxalate than ASA in newly expanding spinach leaves.
社団法人日本土壌肥料学会の論文