Reappraisal of the Role of Sodium in the Light-Dependent Active Transport of Pyruvate into Mesophyll Chloroplasts of C_4 Plants
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概要
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The mechanism of light-dependent active transport of pyruvate in C_4 mesophyll chloroplasts has not been clarified, particularly in Na^+_type C_4 Species, in which the pyruvate uptake into mesophyll chloroplasts is enhanced by illumination or by making a Na^+ gradient (Na^+_jump) across the envelope in the dark. We re-investigated here the effect of Na^+ on the active transport of pyruvate in meso-phyll chloroplasts of Panicum miliaceum, a Na^+_type C4 species, by comparing the rate of pyruvate uptake at vari-ous external pHS under four conditions; in the light and dark together with/without Na^+_jump: (1) At neutral pH, the rate of pyruvate uptake in the dark was enhanced by Na^+_jump but scarcely by illumination. (2) While the en-hancement effect by Na^+_jump was independent of exter-nal pH, that by illumination increased greatly at pH over 7.4, and the effects of light and Na^+ at the alkaline pH were synergistic. (3) The light-enhanced pyruvate uptake was re-lated to stromal alkalization induced by illumination. In fact, pyruvate uptake was induced by H^+_jump in the medi-um from pH 8.0 to 6.7. (4) Stromal pH was lowered by the addition of K^+_pyruvate and more by Na^+_pyruvate into the medium at pH 7.8 in the light. (5) However, the pH and ATP Ievels in the stroma were not affected by Na^+_jump. Thus, we discussed possibility that besides pyruvate/ Na^+ cotransport at neutral pH in the medium, pyruvate/ H^+ cotransport enhanced by the presence of Na^+ operates in mesophyll chloroplasts of Na^+_type C_4 species at alka-line medium.
- 日本植物生理学会の論文
著者
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Aoki Naohiro
Department Of Plant Physiology National Institute Of Agrobiological Sciences
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Aoki Naohiro
Department Of Biochemistry And Molecular Biology Faculty Of Science Saitama University:(present)biol
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Aoki Naohiro
Department Of Agricultural And Environmental Biology Graduate School Of Agricultural And Life Scienc
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Kanai Ryuzi
Department of Biochemistry, Saitama University
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Kanai Ryuzi
Department Of Biochemistry And Molecular Biology Faculty Of Science Saitama University
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