O_2-enhanced induction of photosynthesis in rice leaves : the Mehler-ascorbate peroxidase (MAP) pathway drives cyclic electron flow within PSII and cyclic electron flow around PSI(Plant nutrition)

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概要

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• Lowering the oxygen (O_2) partial pressure from 21kPa to 1kPa delayed the light-dependent increase of the net carbon dioxide (CO_2) assimilation rate in rice (Oryza sativa L. cv. Notohikari) leaves. Researching the underlying molecular mechanisms that act before the start of photosynthesis, we established the following facts. First, O_2 at 21kPa enhanced the quantum yield of PSII [Y(II)] and PSI [Y(I)]. More than 90% of Y(II) and Y(I) were not accounted for by O_2-dependent electron flow in the Mehler-ascorbate peroxidase (MAP) pathway. Both yields increased further with the start of photosynthesis. Second, O_2 enhanced photochemical quenching of chlorophyll (Chl) fluorescence (qL). qL also increased further with the rate of photosynthesis. Third, O_2 enhanced the photo-oxidation of P700. Fourth, O_2 suppressed the reduction of P700. Fifth, O_2 enhanced non-photochemical quenching of Chl fluorescence (NPQ). These results showed that the MAP pathway triggered cyclic electron flow within PSII (CEF-II) and cyclic electron flow around PSI (CEF-I) by inducing ΔpH across thylakoid membranes and oxidizing the plastoquinone pool, before photosynthesis started. We propose that the photosynthetic electron transport system is controlled by the MAP pathway, which would explain the O_2-dependent enhancement of the induction of photosynthesis.

• 2012-12-00

著者

• Amako Katsumi

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

• Miyake Chikahiro

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

• Yamamoto Hiroshi

  Departmemt Of Chemical Engineering University Of Tokyo

• MAKINO Amane

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

• MIYAKE Chikahiro

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

• SUZUKI Yuji

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

• MAKINO Amane

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

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