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Algae 1996;11(2): 203-206. |
| Far-UV Action on Growth, Pigmentation and Photosynthesis of Ulva lactuca (Chlorophyta)
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| Taejun Han
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Department of Biology, University of Inchon
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| ABSTRACT |
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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.
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| Key words:
carotenoids, chlorophylls, far-UV, photosynthesis, respiration, Ulva lactuca |
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