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Effects of oxaloacetate and malate on photosynthesis in leaves and in intact chloroplasts from spinach

Chen Genyun, Ye Jiyu

Shanghai Institute of Plant Physiology,Chinese Academy of Sciences.Shanghai 200032

Abstract

Effects of oxaloacetate (OAA) and malate (MA) on photosynthesis in leaves and intact chloroplasts from spinach were measured: first, the rate of photosynthetic oxygen evolution in leaves increased by 72% after 20#mu#mol/L OAA treatment, and that in intact chloroplasts increased by 78%, but no obvious effect of OAA was observed when NaHCO_(3) 0.5 mmol/L was present in the assay mixture. When leaves and intact chloroplasts were treated by MA at a concentration of 20 #mu#mol/L, the rate of photosynthetic oxygen evolution increased by 127% and 18% respectively. Moreover, net photosynthetic rate (Pn) of leaves were measured after OAA and MA treatment at the concentration of 200#mu#mol/L, the Pn value were increased by 17% and 11% respectively. Finally, it was discussed the possibility to improve the photosynthetic efficiency by building up a micro-cyclic system of C_(4) dicarboxylic acid in C_(3) plants.

Key words: Photosynthetic oxygen evolution;C4 cyclic;Ox-aloacetate(OAA);Malate(MA)

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Citing This Article：

Chen Genyun, Ye Jiyu. Effects of oxaloacetate and malate on photosynthesis in leaves and in intact chloroplasts from spinach. Acta Physiol Sin 2001; 53 (6): (in Chinese with English abstract).