Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Influence of UV-B Radiation on Photosynthesis, Growth and Pigmentation of Chondrus ocellatus (Rhodophyta) from Shallow Water

  • Taejun Han (Division of Biology and Chemistry, University of Incheon) ;
  • Han, Young-Seok (Division of Biology and Chemistry, University of Incheon) ;
  • Cho, Man-Gee (Engineering Research Centre, Dongseo University) ;
  • Park, Jin-Hee (Engineering Research Centre, Dongseo University) ;
  • Goo, Jae-Gun (College of Ocean Science and Technology, Kunsan University) ;
  • Kang, Sung-Ho (Polar Research Center, Korea Ocean Research and Development Institute)
  • Published : 2003.12.01
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Abstract

The UV-B sensitivity was tested for the intertidal species Chondrus ocellatus from Korea, by measuring photosynthesis estimated as effective quantum yield ($\Phi_{PSII}$) of photosystem II (PS II), growth and content and composition of photosynthetic pigments and UV-absorbing pigments (UVAPs). The $$\Phi_{PSII}$ of the alga decreased with increasing time of exposure to UV-B radiation, followed by fast and nearly full recovery indicating dynamic photoinhibiton. Fresh weight-based growth and pigment contents of C. ocellatus were not seriously affected by UV-B radiation. A single broad peak at 327 nm was obtained from methanol extracts of C. ocellatus, and the absorbance peak increased with increasing UV. The single peak was resolved into three peaks (311, 330 and 336 nm) by the fourth -derivative, and quantitative change in response to UV-B radiation occurred only at 330 nm. High performance liquid chromatography (HPLC) analysis of purified extracts indicated that three MAAs (mycosporine-like amino acids) are present, asterina 330, palythine and shinorine. Field observations during three growing months showed that C. ocellatus exhibit the highest amount of UVAPs in May followed by July and little trace in September, coinciding with the species' phenology. In an ecological context, dynamic photoinhibition as well as accumulation of UVAPs may enable the shallow water red alga C. ocellatus to be well adapted to high UV-B environments.

Keywords

References

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