O_2 supports 3-phosphoglycerate-dependent O_2 evolution in chloroplasts from spinach leaves(Plant nutrition)

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概要

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• We tested the hypothesis that the Mehler-ascorbate peroxidase (MAP) pathway supports 3-phosphoglycerate (PGA)-dependent oxygen (O_2) evolution using intact chloroplasts. Lowering O_2 concentration (<1μM) suppressed PGA-dependent O_2 evolution rate. High O_2 concentration (about 250μM) enhanced the electron fluxes in Photosystem II (PSII). Also, high O_2 concentration oxidized both Q_A in PSII and Cyt f in thylakoid membranes. These results indicated that the MAP pathway stimulated photosynthetic electron transport. Furthermore, electrochromic shift signal was also increased at high O_2 concentration, compared to low O_2 concentration. Non-photochemical quenching of chlorophyll fluorescence was also enhanced at high O_2 concentration. These data support our hypothesis that the MAP pathway functioned in intact chloroplasts and accelerated PGA-dependent O_2 evolution by inducing ΔpH formation to produce and supply adenosine triphosphate (ATP) to the conversion reaction of PGA to glyceraldehyde 3-phosphate through 1,3-diphosphoglycerate in chloroplasts.

• 2012-08-00

著者

• Amako Katsumi

  Faculty Of Nutrition Kobe Gakuin University:high Technology Research Center Kobe Gakuin University

• Sugimoto Toshio

  Department Of Biological And Environmental Science Faculty Of Agriculture Graduate School Of Agricul

• Miyake Chikahiro

  Department Of Biological And Environmental Science Faculty Of Agriculture Graduate School Of Agricul

• Takagi Daisuke

  Department Of Internal Medicine Hyogo Prefectural Nishinomiya Hospital

• Yamamoto Hiroshi

  Departmemt Of Chemical Engineering University Of Tokyo

• MAKINO Amane

  Department of Agriculture, Graduate School of Agricultural Science, Tohoku University:CREST, JST

• SUGIMOTO Toshio

  Department of Biological and Environmental Science, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University

• TAKAGI Daisuke

  Department of Biological and Environmental Science, Faculty of Agriculture, Graduate School of Agricultural Science, Kobe University

• MAKINO Amane

  Department of Agriculture, Graduate School of Agricultural Science, Tohoku University

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