EVIDENCE A PHOTOPROTECTIVE FOR SECONDARY CAROTENOIDS OF SNOW ALGAE<sup>1</sup>

Journal of Phycology - Tập 29 Số 4 - Trang 427-434 - 1993
Robert R. Bidigare1, Michael Ondrusek1, Mahlon C. Kennicutt2, Rodolfo Iturriaga3, H. Rodger Harvey4, Ronald W. Hoham5, Stephen A. Macko6
1Department of Oceanography, University of Hawaii, Honolulu, Hawaii 96822
2Geochemical of Biological Sciences, University of Southern California, Los Angeles, California 90089
3Department of Biology, University of Southern California, Los Angeles, California 90089
4Chesapeake Biological Laboratory, The University of Maryland Center for Environmental and Estuarine Studies, Solomons, Maryland 20688
5Department of Biology, Colgate University, Hamilton, New York 13346
6Department of Environmental Sciences University of Virginia, Charlottesville, Virginia 22903

Tóm tắt

ABSTRACTSnow algae occupy a unique habitat in high altitude and polar environments. These algae are often subject to extremes in nutrient availability, acidity, solar irradiance, desiccation, and ambient temperature. This report documents the accumulation of secondary carotenoids by snow algae in response to the availability of nitrogenous nutrients. Unusually large accumulations of astaxanthin esters in extra‐chloroplastic lipid globules produce the characteristics red pigmentation typical of some snow algae (e.g. Chlamydomonas nivalis (Bauer) Wille). Consequently these compounds greatly reduce the amount of light available for absorption by the light‐harvesting pigment‐protein complexes, thus potentially limiting photoinhibition and photodamage caused by intense solar radiation. The esterification of astaxnthin with fatty acids represents a possible mechanism by which this chromophore can be concentrated within cytoplasmic globules to maximize its photoprotective efficiency.

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