Effects of acute and chronic UV-B exposure on a green alga: a continuous culture study using a computer-controlled dynamic light regime

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. I...

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Bibliographic Details
Published in:Plant ecology 1997, Vol.128 (1/2), p.28-40
Main Authors: Veen, A, Reuvers, M, Roncak, P
Format: Article
Language:English
Subjects:
Algae
Cell growth
Chlorophycota
DNA damage
dose response
ecosystems
global warming
inhibition
Irradiance
Light
net assimilation rate
nutrient availability
phosphorus
photosynthesis
Photosynthetically active radiation
Phytoplankton
pollution
Radiation damage
Radiation dosage
Ultraviolet radiation
UV-B and Aquatic Ecosystems
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Summary: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.
ISSN:1385-0237
1573-5052