UV radiation induced stress does not affect DMSP synthesis in the marine prymnesiophyte Emiliania huxleyi

M van Rijssel*, A.G.J. Buma

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    28 Citations (Scopus)
    206 Downloads (Pure)

    Abstract

    A possible coupling between UV radiation (UVR; 280 to 400 nm) induced stress and the production of dimethylsulfoniopropionate (DMSP), the precursor of the climate-regulating gas dimethylsulfide (DMS), was investigated in the marine prymnesiophyte Emiliania huxleyi. To this end, axenic cultures of E. huxleyi were exposed to a range of UVR doses for 2 consecutive days. During and after these treatments, growth, photosynthetic activity, cell size, DNA damage, sugar accumulation and DMSP concentrations were followed, The vulnerability of E. huxleyi for relatively low UVR doses was demonstrated by the inhibition of growth and the simultaneous occurrence of DNA damage. Also, mean cell size increased and sugars accumulated as a result of the UVR treatments. In contrast, no effect was observed on the optimal quantum yield of Photosystem II (PSII), a measure of the efficiency of photosynthesis. With increasing UVR dose, cellular DMSP content increased, However, the intrdcellular DMSP concentrations remained constant at the level typical for the applied temperature and salinity conditions, due to accompanying increase in cell size. The increased cellular DMSP content did not compensate, therefore, for the decreased growth rates, resulting in an overall decrease in the total amount of DMSP produced in the cultures. The UVR effects as induced in this study are assumed to be severe as compared with natural solar conditions, especially because high in situ UVAR (315 to 400 nm) may ameliorate UVBR damage by activation of photorepair. Yet the presented results imply that when (increased) UV(B)R causes growth rate reduction of E. huxleyi in situ, DMSP fluxes are likely to be reduced too.

    Original languageEnglish
    Pages (from-to)167-174
    Number of pages8
    JournalAquatic Microbial Ecology
    Volume28
    Issue number2
    DOIs
    Publication statusPublished - 26-Jun-2002

    Keywords

    • UV radiation
    • phytoplankton
    • Emiliania huxleyi
    • cyclobutane pyrimidine dimers
    • DNA
    • thymine dimers
    • dimethylsulfide
    • dimethylsulfoniopropionate
    • salinity
    • F-v/F-m
    • SOLAR ULTRAVIOLET-RADIATION
    • INDUCED DNA-DAMAGE
    • B RADIATION
    • ICE ALGAE
    • ANTARCTIC PHYTOPLANKTON
    • CARBON FIXATION
    • GROWTH
    • ATLANTIC
    • BACTERIOPLANKTON
    • PHOTOINHIBITION

    Cite this