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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.(Report)

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

Plant Journal, Dec, 2011, Vol.68(6), p.966(11) [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.(Report)
  • Autor: Yamori, Wataru ; Sakata, Naoki ; Suzuki, Yuji ; Shikanai, Toshiharu ; Makino, Amane
  • Assuntos: Fluorescence -- Analysis ; Fluorescence -- Physiological Aspects ; Photosynthesis -- Growth ; Photosynthesis -- Analysis ; Photosynthesis -- Physiological Aspects ; Chlorophyll -- Growth ; Chlorophyll -- Analysis ; Chlorophyll -- Physiological Aspects ; Plant Biochemistry -- Growth ; Plant Biochemistry -- Analysis ; Plant Biochemistry -- Physiological Aspects ; Universities And Colleges -- Analysis ; Universities And Colleges -- Physiological Aspects
  • É parte de: Plant Journal, Dec, 2011, Vol.68(6), p.966(11)
  • Descrição: To authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1365-313X.2011.04747.x Byline: Wataru Yamori (1,*), Naoki Sakata (1), Yuji Suzuki (1), Toshiharu Shikanai (2), Amane Makino (1) Keywords: NAD(P)H dehydrogenase; cyclic electron transport; temperature response; photosynthesis; CO assimilation; light response Abstract: Summary 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 (Oryza sativa) that is defective in CHLORORESPIRATORY REDUCTION 6 (CRR6), which is required for accumulation of sub-complex A of the chloroplast NDH complex (crr6). NdhK was not detected by Western blot analysis in crr6 mutants, resulting in lack of a transient post-illumination increase in chlorophyll fluorescence, and confirming that crr6 mutants lack NDH activity. When plants were grown at 28 or 35[degrees]C, all examined photosynthetic parameters, including the CO.sub.2 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 [mu]mol photons m.sup.-2 sec.sup.-1), were similar between crr6 mutants and control plants. However, when plants were grown at 20[degrees]C, all the examined photosynthetic parameters were significantly lower in crr6 mutants than control plants, and this effect on photosynthesis caused a corresponding reduction in plant biomass. The F.sub.v/F.sub.m ratio was only slightly lower in crr6 mutants than in control plants after short-term strong light treatment at 20[degrees]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 crr6 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. Author Affiliation: (1)Department of Applied Plant Science, Graduate School of Agricultural Science, Tohoku University, Aoba-ku, Sendai 981-8555, Japan (2)Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan Article History: Received 22 June 2011; revised 4 August 2011; accepted 15 August 2011; published online 10 October 2011. Article note: (*) (fax +81 22 717 8765; e-mail wataru.yamori@biochem.tohoku.ac.jp).
  • Idioma: English

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