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JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 1 | PAGES 17-27 | 1995
© Oxford University Press

research-article

Growth responses, P-uptake and loss of flagellae in Chlamydomonas reinhardtii exposed to UV-B

Dag O. Hessen, Ellen Van Donk1 and Tom Andersen

University of Oslo, Department of Biology, Division of Limnology PO Box 1027, Blindern, 0316 Oslo, Norway 1Agricultural University Wageningen, Department of Water Quality Management and Aquatic Ecology PO Box 8080, 6700 DD Wageningen, The Netherlands

Received on February 7, 1994; accepted on August 29, 1994 The flagellated, planktonic green alga Chlamydomonas reinhardtii was exposed to UV-B doses (peak intensity at 312 nm) from 0.6 to 36 kJ m-2. Flagellar status, uptake of 33P and growth rates were judged in both P-limited and P-saturated algae. A linear relationship was found between loss or withdrawal of flagellae and UV exposure. Even 10 min (0.6 kJ m-2 exposure initiated inactivation of flagellae and total loss as well as signs of cell wall destruction were found at the highest doses Within 72 h after irradiation, flagellar recovery had occurred in 34% of non-limited and 87% of P-limited cells. Uptake of P was apparently enhanced at low doses, but fell to almost zero at the higher doses. In P-saturated cells, an initial high uptake was followed by a pronounced P leakage upon radiation. A similar pattern was found for growth rates, where notably P-limited cells gained increased growth at low doses, while growth was drastically reduced at 16 kJ m-2. The data show that major functional parameters in this freshwater flagellate are affected by moderate doses of UV-B, and that reduced P uptake is well correlated with inactivation of flagellae and growth inhibition.


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