Abstract
The green alga Selenastrum capricornutum was grown in a specially developed continuous culture system to study long-term effects of chronic UV-B exposure. The new system improves upon previous laboratory culture approaches. It is demonstrated that short-term experiments underestimate UV-B effects. It is also shown that photoinhibition cannot explain the effects under chronic exposure. Under both nutrient-replete and phosphorus-limiting conditions a UV-B mediated delay in cell division rate and an increase in the cellular content of proteins, carbohydrates and chlorophyll a was measured. Transition experiments showed that complete acclimatisation to UV-B took several cell cycles. DNA damage appears to be the major cause of the observed long-term UV-B effects.
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Veen, A., Reuvers, M., Ronçak, P. (1997). Effects of acute and chronic UV-B exposure on a green alga: a continuous culture study using a computer-controlled dynamic light regime. In: Rozema, J., Gieskes, W.W.C., Van De Geijn, S.C., Nolan, C., De Boois, H. (eds) UV-B and Biosphere. Advances in vegetation science, vol 17. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5718-6_3
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DOI: https://doi.org/10.1007/978-94-011-5718-6_3
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