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Cyclic electron flow around photosystem I via chloroplast NAD(P)H dehydrogenase (NDH) complex performs a significant physiological role during photosynthesis and plant growth at low temperature in rice

Yamori, Wataru ; Sakata, Naoki ; Suzuki, Yuji ; Shikanai, Toshiharu ; Makino, Amane

Plant Journal, December 2011, Vol.68(6), pp.966-976 [Periódico revisado por pares]

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  • Título:
    Cyclic electron flow around photosystem I via chloroplast NAD(P)H dehydrogenase (NDH) complex performs a significant physiological role during photosynthesis and plant growth at low temperature in rice
  • Autor: Yamori, Wataru ; Sakata, Naoki ; Suzuki, Yuji ; Shikanai, Toshiharu ; Makino, Amane
  • Assuntos: NadPH Dehydrogenase ; Cyclic Electron Transport ; Temperature Response ; Photosynthesis ; Co 2 Assimilation ; Light Response
  • É parte de: Plant Journal, December 2011, Vol.68(6), pp.966-976
  • Descrição: The role of NAD(P)H dehydrogenase (NDH)‐dependent cyclic electron flow around photosystem I in photosynthetic regulation and plant growth at several temperatures was examined in rice () that is defective in CHLORORESPIRATORY REDUCTION 6 (CRR6), which is required for accumulation of sub‐complex A of the chloroplast NDH complex (). NdhK was not detected by Western blot analysis in mutants, resulting in lack of a transient post‐illumination increase in chlorophyll fluorescence, and confirming that mutants lack NDH activity. When plants were grown at 28 or 35°C, all examined photosynthetic parameters, including the CO assimilation rate and the electron transport rate around photosystems I and II, at each growth temperature at light intensities above growth light (i.e. 800 μmol photons m sec), were similar between mutants and control plants. However, when plants were grown at 20°C, all the examined photosynthetic parameters were significantly lower in mutants than control plants, and this effect on photosynthesis caused a corresponding reduction in plant biomass. The / ratio was only slightly lower in mutants than in control plants after short‐term strong light treatment at 20°C. However, after long‐term acclimation to the low temperature, impairment of cyclic electron flow suppressed non‐photochemical quenching and promoted reduction of the plastoquinone pool in mutants. Taken together, our experiments show that NDH‐dependent cyclic electron flow plays a significant physiological role in rice during photosynthesis and plant growth at low temperature.

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