Stimulation of Malate Synthesis by Glycolate in Tomato Leaves in Relation to CO_2 Concentration
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概要
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The mechanism by which malate synthesis from CO_2 is increased under low concentrations of CO_2 was investigated in C_3 plants. A number of metabolites were ad-ministered to illuminated tomato leaves, and their effects on the incorporation of ^<14>CO_2 into malate were determined. Compared with water as a control, glycolate, glyoxylate, D,L-glycerate, glycine, phosphoglycolate and L-serine increased malate synthesis by factors of 6.8, 3.8, 3.3, 2.5, 2.3 and 2.2, respectively. The effect of exogenous glycolate on malate synthesis from CO_2 was dependent on its concentration up to 100 mM, but was independent of ambient CO_2 concentration. The feeding of 1-^<14>C-glycolate in the light indicated that glycolate stimulated the carbon flow from CO_2 to malate. The analysis of the products of ^<14>CO_2 fixation in illuminated leaves supplied with glycolate showed increases in malate and sugar and decreases in serine and phosphate esters. However, this stimulated malate synthesis ceased when malonate was supplied simultaneously with glycolate. Treatment with glycolate did not affect the dark ^<14>CO_2-fixation, but increased the ^<14>C-malate synthesis, with a corresponding decrease in ^<14>C-aspartate and ^<14>C-glutamate. These results suggest that exogenous glycolate activates malate dehydrogenase in leaves, and that the increased glycolate formation at low CO_2 concentrations is associated with the increased malate synthesis from CO_2.
- 日本植物生理学会の論文
著者
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YAMAUCHI Minoru
Depart, hent of Agricultural Chemistry
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Yamada Yoshio
Department Of Agricultural Chemistry Kyushu University
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Yamada Yoshio
Department Of Agricultural Chemistry Faculty Of Agriculture Kyushu University
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Yamada Yoshio
Department Of Agricultural Chemistry Faculty Of Agriculture
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