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ALGAE > Volume 11(2); 1996 > Article
ALGAE 1996;11(2): 203-206.
Far-UV Action on Growth, Pigmentation and Photosynthesis of Ulva lactuca (Chlorophyta)
Taejun Han
Department of Biology, University of Inchon
ABSTRACT
Growth, pigmentation and photosynthesis were determined for Ulva lactuca L. exposed to far-UV irradiation and non-irradiation treatment. UV-irradiated discs cut from thalli showed a severe growth inhibition in surface area but not in fresh weight compared with control samples. On exposure to 4 min the level of chlorophylls fell sharply whereas no such decrease occurred in carotenoid contents. The chlorophylla a/b ratio remained rather constant. The reduction in chlorophylls paralleled with the decrease in photosynthetic activity. UV-photoinhibition was characterised by a significant depression in maximum light-saturated rates of photosynthesis without any change in quantum efficiency. Respiration was not affected by UV as much as photosythetic oxygen production.
Key words: carotenoids, chlorophylls, far-UV, photosynthesis, respiration, Ulva lactuca


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