1999 Fiscal Year Final Research Report Summary
Acclimation of photosynthetic properties in ice algae
| Project/Area Number |
09640760
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生態
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| Research Institution | National Institute of Polar Research |
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Principal Investigator |
IMURA Satoshi National Institute of Polar Research, Research Associate, 研究系, 助手 (90221788)
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| Co-Investigator(Kenkyū-buntansha) |
KASHINO Yasuhiro Himeji Institute of Technology, Faculty of Science, Research Associate, 理学部, 助手 (20221872)
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| Project Period (FY) |
1997 – 1999
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| Keywords | Ice algae / Diatom / Photosynthesis / Photosystem / RubisCO / Diadinoxan thin cycle / Acclimation / accessory pigments |
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| Research Abstract |
Ice algae and diatoms perform highly efficient photosynthesis, in spite of these very severe environments. We investigated how their light-harvesting systems or photosystems acclimate to very low irradiance to achieve efficient photosynthesis. The way of acclimation was very unique, which was opposite to that of higher plants or green algae. In ice algae, the accessory pigments and also RubisCO were decreased and the ratio of photosystem I (PSI) to PS II was lowered in lower irradiance. And photosynthetic systems acclimated highly to very low irradiance were protected by functional diadinoxanthin cycle, equivalent to the xanthophylls cycle of higher plant, against higher irradiance.
The maximum photosysthetic rate was also retained at the same level and photo inhibition could not be observed under illumination up to -800 uEm-2s-1. These properties may indicate that the efficient light-energy utilization and functioning of photosystems of the diatom cells under large variation of irradiance at short time-scale relative to their generation time such as in the ice.
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[Publications] Kashino, Y., Fujimoto, K, Akamatu, A., Koike, H., Satoh K and S.: "Photosynthetic pigment composition of ice algal and phytoplankton assemblages in early spring in Saroma ko lagoon, Hokkaido, Japan"Proc. NIPR Symp. Plar Biol. 11. 22-32 (1998)
Description
「研究成果報告書概要(和文)」より
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[Publications] Kashino, Y., Fujimoto, K, Akamatu, A., Koike, H. K.stoh, Tikeya ,S. Imura, K, Watanabe and Kudoh: "Acclimation of ice algae to higher irradiance"Garab, G. (ed), Photosysthesis : Mechanisms and Effects. Vol.III. 2237-2240 (1998)
Description
「研究成果報告書概要(和文)」より
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[Publications] Kashino, Y., Fujimoto, K., Akamatsu, A., Kaoike, H., Satoh K., and Kudoh S.: "Photosynthetic pigment composition of ice algal and phytoplankton assemblages in early spring in Saroma ko lagoon, Hokkaido, Japan."Proc. NIPR symp. Polar Biol. 11. 22-32 (1998)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Kashino, Y., K.Fujimoto, A.Akamatsu, H.Koike, K.Satoh, T.Ikeya, S.Imura, K.Watanabe and S.Kudoh: "Acclimation of ice algae to higher irradiance."Garab, G.(ed.), Photosysthesis : Mechanism and Effects. III. 2237-2240 (1998)
Description
「研究成果報告書概要(欧文)」より
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