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Marine Biology

, Volume 126, Issue 2, pp 183–191 | Cite as

Influence of ultraviolet-radiation on chlorophyll fluorescence and growth in different life-history stages of three species of Laminaria (phaeophyta)

  • M. J. Dring
  • V. Makarov
  • E. Schoschina
  • M. Lorenz
  • K. Lüning
Article

Abstract

Zoospores, gametophytes, young sporophytes and discs cut from mature sporophytes of Laminaria digitata, L. hyperborea and L. saccharina were exposed in the laboratory to UV-radiation, with a spectral composition and irradiance similar to natural sunlight, for periods ranging from 15 min to 8 d, and were then returned to white light. Germination of zoospores and the growth of gametophytes were reduced after exposures to UV longer than 1 h, whereas UV had little effect on the growth of young or mature sporophytes unless exposure continued for more than 48 h. The variable fluorescence (Fv:Fm) of all stages was strongly reduced immediately after short exposures to UV, but recovered almost completely within 24 h. However, exposure of gametophytes to UV for >4 h resulted in little or no recovery of Fv:Fm, whereas >16 h of UV were required to produce this result in young sporophytes, and >48 h in mature sporophytes. Thus, sensitivity to UV-radiation decreased from gametophytes to sporophytes, and with increasing age of sporophytes, but, in gametophytes, growth appeared to be a more sensitive indicator of UV-damage than Fv:Fm after 24 h recovery. The responses to UV of the zoospores and gametophytes of all three species were similar, but both growth and fluorescence measurements suggested that the sporophytes of L. saccharina were more sensitive to UV than those of the other two species.

Keywords

Chlorophyll Chlorophyll Fluorescence White Light Fluorescence Measurement Saccharina 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • M. J. Dring
    • 1
  • V. Makarov
    • 1
  • E. Schoschina
    • 1
  • M. Lorenz
    • 1
  • K. Lüning
    • 1
  1. 1.Meeresstation HelgolandBiologische Anstalt HelgolandHelgolandGermany

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