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Photosynthetic characteristics of marine Synechococcus spp. with special reference to light environments near the bottom of the euphotic zone of the open ocean

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Abstract

The present study aimed to resolve the question why marine Synechococcus spp. abundantly occur even at the bottom of the euphotic zone in the Kuroshio are. Photosynthesis under such conditions was examined using simulated blue-green model light (BGL). Results indicated that photosynthesis of marine Synechococcus spp. under BGL is as active enough to support growth of these organisms. Examination of light-harvesting under BGL indicated that active photosynthesis is permitted by an unusually high abundance of phycoerythrin (PE), which is the main light-harvesting pigment for photosystem II (PSII), due to a phycobilisome (PBS) structure which is different from ordinary hemidiscoidals. Although the absorption maximum of PE is located at longer wavelengths than the energy maximum of BGL, PE was found to absorb BGL significantly. Thus, BGL cannot be a typical photosystem I (PSI) light. PSII is also significantly excited by BGL. Carotenoids, which largely absorb BGL, were found to be effective in light-harvesting for PSI. Based on the results obtained, possible reasons why marine Synechococcus spp. commonly occur in warm waters were discussed. Two strains of Synechococcus spp. isolated from the Gulf Stream in 1981 and from Kuroshio, Japan in 1983 were used in the present study.

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Authors and Affiliations

  1. Department of Cell Biology, National Institute for Basic Biology, 444, Okazaki, Aichi, Japan

    T. Ikeya, K. Ohki & Y. Fujita

  2. Botany Department, Faculty of Science, University of Tokyo, Bunkyo-ku, 113, Tokyo, Japan

    T. Ikeya & M. Takahashi

  3. College of Marine Sciences and Technology, Tokai University, Orito, 424, Shimizu, Shizuoka, Japan

    K. Ohki

Authors
  1. T. Ikeya
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  2. K. Ohki
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  3. M. Takahashi
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  4. Y. Fujita
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Communicated by T. Ikeda, Nagasaki

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Ikeya, T., Ohki, K., Takahashi, M. et al. Photosynthetic characteristics of marine Synechococcus spp. with special reference to light environments near the bottom of the euphotic zone of the open ocean. Marine Biology 118, 215–221 (1994). https://doi.org/10.1007/BF00349787

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  • DOI: https://doi.org/10.1007/BF00349787

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