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The green alga Selenastrum capricornutum was grown in a specially developed continuous culture system to study long-term effects of chronic W-B exposure. The new system improves upon previous laboratory culture approaches. It is demonstrated that short-term experiments underestimate W-B effects. It is also shown that photoinhibition cannot explain the effects under chronic exposure. Under both nutrient-replete and phosphorus-limiting conditions a W-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 W-B effects. [KEYWORDS: algal growth, algal photosynthesis, green alga, phosphorus limitation, UV-B inhibition]
Original languageEnglish
Pages (from-to)28-40
JournalPlant Ecology
Issue number1-2
StatePublished - 1997

ID: 226298