Abstract
The marine diatoms Lauderia annulata Cleve and Thalassiosira rotula Meunier were grown at different salinities (20, 35 and 45‰) and exposed to different levels of midultraviolet, UV-B) 439, 717 and 1230 J m-2 d-1, weighted) for 2 d. A low UV-B dose (439 J m-2 d-1) usually caused a slight increase in biomass production (dry weight) compared to non-UV-B irradiated cells. Enhanced UV-B radiation (717 J m-2 d-1) depressed protein and pigment content (chlorophyll a, chlorophyll c 1+c2 and carotenoids), especially in algae grown at 20 or 35‰ salt concentration of the nutrient solution. The effect of UV-B radiation (717 J m-2 d-1) on the pattern and concentration of amino acids was species-dependent. Aspartic acid was reduced in all tested diatoms. A drastic increase in glutamine and a reduction in glutamic acid pools could be observed in L. annulata samples, but no significant variation of the impact of UV-B was found in dependence on the salt concentration of the nutrient medium. T. rotula cells grown at 35‰ S showed an increase of glutamic acid and a decrease of glutamine levels after UV-B radiation. The results are discussed in relation to the impact of UV-B upon carbon and nitrogen metabolism.
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Communicated by O. Kinne, Oldendorf/Luhe
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Döhler, G. Effect of UV-B radiation on the marine diatoms Lauderia annulata and Thalassiorsira rotula grown in different salinities. Mar. Biol. 83, 247–253 (1984). https://doi.org/10.1007/BF00397456
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DOI: https://doi.org/10.1007/BF00397456