| Project/Area Number |
04044176
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | OKAZAKI National Research Institutes National Institute for Basic Biology |
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Principal Investigator |
FUJITA Yoshihko Inst.Basic Biol., Professor, 基礎生物学研究所, 教授 (40013560)
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| 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)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1993: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Chlamydomonas / Chlorophyll a synthesis / Dunaliella / Light acclimation / Photosynthesis / Photosystem I / Protein synthesis / 環境適応 / 系I・系II比 / クロロフィル / 光環境適応 / 光化学系工 / 蛋白合成 |
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| 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.
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