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1994 Fiscal Year Final Research Report Summary

Regulation of thylakoid assembly in response to environment

Research Project

Project/Area Number 04044176
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionOKAZAKI National Research Institutes National Institute for Basic Biology

Principal Investigator

FUJITA Yoshihko  Inst.Basic Biol., Professor, 基礎生物学研究所, 教授 (40013560)

Co-Investigator(Kenkyū-buntansha) ANASTASIOS Melis  Univ.California, Berkeley, Professor, バークレー校, 教授
AIZAWA Katsunori  Inst.Basic Biol., Res.Assoc., 基礎生物学研究所, 助手 (20249957)
OHKI Kaori  Tokai Univ., Professor, 海洋学部, 教授 (90101104)
Project Period (FY) 1992 – 1994
KeywordsChlamydomonas / Chlorophyll a synthesis / Dunaliella / Light acclimation / Photosynthesis / Photosystem I / Protein synthesis
Research Abstract

The work addresses the adjustment of the photosystem ratio in the green alga Chlamydomonas reinhardtii. It is shown that green algae, much like cyanophytes and higher plants, adjust and optimize the ratio of the two photosystems in response to the quality of irradiancxe during growth. Such adjustments are compensation reactions and help C.reinhardtii to retain a quantum efficiency of photosynthesis near the theoretical maximum. The detwection of the operation of a molecular feedback mechanism for the PSI/PSII ratio adjustment in green algae strengthens the notion of the highly conserved nature of this mechanism among probably all oxygen evolving photosynthetic organisms. The work delineates chromatic effects on chlorophyll accumulation in the chloroplasts of C.reinhardtiifrom those pertaining to the regulation of the PSI/PSII ratio. It is shown that different photoreceptors are involved in the regulation of the two phenomena. Findings in this work are expected to serve as the basis of future biochemical and mutagenesis experiments aimed to identify important enzymatic steps in the signal transduction pathway and, thus, it will contribute to the elucidation of the molecular mechanism for the PSI/PSII ratio adjustment in oxygenic photosynthesis.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 阿部信一郎、村上明男、大城香、有賀裕勝、藤田善彦: "Changes in stoichiometry among PSI,PSII and Cytbf complexes in response to chromatic light" Plant Cell Physiology. 35. 901-906 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Gu,T.-Q.,村上明男,岩間由美,Adhikary,S.P.,藤田善彦: "Changes in the cytochrome oxidase activity in response to light regime for photosynthesis" Plant Cell Physiology. 35. 1135-1140 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤田善彦、村上明男、相澤克則: "Accumulation of protochllide in cells of Synechocystis 6714 with a low PSI/PSII stoichiometry" Plant Cell Physiology. 36(in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大城香、藤田善彦: "Intracellular location of cytochrome oxidase active in vivo in the cyanophytes Synechocystis and Anacystis" Protoplasma. (in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Melis,A.,村上明男,Nemson,J.A.,相澤克則,大城香,藤田善彦: "Chromatic requlation of photosystem stoichiometry in Chlamydomonas reinhardtii alters thylakoid membrane structure-function" Plant Physiology,. (submitted).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村上明男,Melis,A.,Nemson,J.A.,藤田善彦: "Time course of variation of photosystem stoichiometry upon shift of light regimeobserved with Chlamydomonas reinhardtii" Plant Cell Physiology,. (submitted).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Abe, S., Murakami, A., Ohki, K., Aruga, Y.and Fujita, Y.: "Changes in stoichiometry among PSI,PSII and Cyt b-f complexes in response to chromatic light" Plant Cell Physiology. 35. 901-906 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Gu, T.-Q., Iwama, Y., Murakami, A., Adhikary, S.P.and Fujita, Y.: "Changes in the cytochrome c oxidase activity in response to light regime for photosynthesis" Plant Cell Physiology. 35. 1135-1140 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fujita, Y., Murakami, A.and Aizawa, K.: "Accumulation of protochlorophyllide in cells of Synechocystis 6714 with a low PSI/PSII stoichiometry" Plant Cell Physiology. 36 (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohki K.and Fujita Y.: "Intracellular location of cytochrome oxidase active in vivo in the cyano-phytes Synechocystis 6714 and Anacystis nidulans Tx20 and R2" Protoplasma. (in press.). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Melis A., Murakami A., Nemson J.A., Aizawa K., Ohki K.and Fujita Y.: "Chromatic regulation of photosystem stoichiometry in Chlamydomonas reinhardtii alters thylakoid membrane structure-function and improves the quantum efficiency of photosynthesis" Plant Physiology. (submitted).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Murakami, A., Nemson J.A., Melis, A.and Fujita, Y.: "Time course of variation of photosystem stoichiometry upon shift of light regime observed with Chlamydomonas reinhardtii" Plant Cell Physiology. (submitted.).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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