The effect of UV-B radiation on photosynthesis and respiration of phytoplankton,benthic macroalgae and seagrasses |
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Authors: | A W D Larkum W F Wood |
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Institution: | (1) School of Biological Sciences, University of Sydney, 2006, NSW, Australia |
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Abstract: | Several species of marine benthic algae, four species of phytoplankton and two species of seagrass have been subjected to ultraviolet B irradiation for varying lengths of time and the effects on respiration, photosynthesis and fluorescence rise kinetics studied. No effect on respiration was found. Photosynthesis was inhibited to a variable degree in all groups of plants after irradiation over periods of up to 1 h and variable fluorescence was also inhibited in a similar way. The most sensitive plants were phytoplankton and deep-water benthic algae. Intertidal benthic algae were the least sensitive to UV-B irradiation and this may be related to adaptation, through the accumulation of UV-B screening compounds, to high light/high UV-B levels. Inhibition of variable fluorescence (Fv) of the fluorescence rise curve was a fast and sensitive indicator of UV-B damage. Two plants studied, a brown alga and a seagrass, showed very poor recovery of Fv over a period of 32 h.Abbreviations Fm-
fluorescence yield with reaction centres closed
- Fo-
fluorescence yield with reaction centres open
- Fv-
variable fluorescence
- PAR-
photosynthetically active radiation
- P680-
primary donor of Photosystem II
- O-
primary quencher of Photosystem II
- QA-
primary quinone acceptor of Photosystem II
- UV-B-
ultraviolet B |
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Keywords: | oxygen evolution UV screening compounds variable fluorescence |
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