Conversion of<scp>L</scp>-Galactono-1,4-lactone to<scp>L</scp>-Ascorbate Is Regulated by the Photosynthetic Electron Transport Chain in<i>Arabidopsis</i>

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  • YABUTA Yukinori
    Department of Advanced Bioscience, Faculty of Agriculture, Kinki University School of Agricultural, Biological, and Environmental Sciences, Faculty of Agriculture, Tottori University
  • MARUTA Takanori
    Department of Advanced Bioscience, Faculty of Agriculture, Kinki University
  • NAKAMURA Ayana
    Department of Advanced Bioscience, Faculty of Agriculture, Kinki University
  • MIEDA Takahiro
    Department of Advanced Bioscience, Faculty of Agriculture, Kinki University
  • YOSHIMURA Kazuya
    Department of Food and Nutritional Science, College of Bioscience and Biotechnology, Chubu University
  • ISHIKAWA Takahiro
    Faculty of Life and Environmental Science, Shimane University
  • SHIGEOKA Shigeru
    Department of Advanced Bioscience, Faculty of Agriculture, Kinki University

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  • Conversion of L-Galactono-1,4-lactone to L-Ascorbate Is Regulated by the Photosynthetic Electron Transport Chain in Arabidopsis

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In this study we focused on the effects of light irradiation and the addition of L-galactono-1,4-lactone (L-GalL) on the conversion of exogenous L-GalL to L-ascorbate (AsA) and the total AsA pool size in detached leaves of Arabidopsis plants and transgenic plants expressing the rat L-gulono-1,4-lactone oxidase gene. Increases in the total AsA level in L-GalL-treated leaves depended entirely on light irradiation. Treatment with an inhibitor of photosynthetic electron transport together with L-GalL reduced the increase in total AsA under light. Light, particularly the redox state of photosynthetic electron transport, appeared to play an important role in the regulation of the conversion of L-GalL to AsA in the mitochondria, reflecting the cellular level of AsA in plants.

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