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  • 1.
    Gylle, A. Maria
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Nygård, Charlotta A.
    Cty Adm, Dept Environm, S-87186 Harnosand, Sweden .
    Svan, Carina I.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Pocock, Tessa
    Heliospectra AB, S-50630 Boras, Sweden.
    Ekelund, Nils G. A.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Photosynthesis in relation to D1, PsaA and Rubisco in marine and brackish water ecotypes of Fucus vesiculosus and Fucus radicans (Phaeophyceae)2013In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 700, no 1, p. 109-119Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to investigate photosynthetic differences between the marine, Norwegian Sea ecotype and the brackish, Bothnian Sea ecotype of F. vesiculosus and F. radicans and to see whether photosynthetic differences could be connected with the relative amounts of D1 protein (PSII), PsaA (PSI) protein and/or Rubisco. For this purpose, we tested if a higher photosynthetic maximum (P (max)) in the Atlantic Ocean ecotype of F. vesiculosus relative to the Baltic Sea ecotype, and an increase of the P (max) in Baltic Sea ecotype of F. vesiculosus at higher salinity, could be due to an increase in the relative amounts of Rubisco. The proteins have been evaluated on a relative basis. Immunoblot signals showed that the amount of Rubisco was higher in both ecotypes of F. vesiculosus than in F. radicans, but no differences could be detected between the two ecotypes of F. vesiculosus. The results suggest an uneven photosystem protein stoichiometry in Fucus, with more of the PSI protein PsaA relative to the PSII protein D1. The difference in P (max) between the two ecotypes of F. vesiculosus might be related to the difficulties for the algae to adapt to the environment in Bothnian Sea.

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