Photosynthetic performance of the Chlorophyte Ulva rigida measured in Patagonia on site.
Häder DP, Lebert M, Helbling EW (2000)
Publication Type: Book chapter / Article in edited volumes
Publication year: 2000
Edited Volumes: Recent research developments in photochemistry and photobiology
Book Volume: 4
Pages Range: 259 - 269
ISBN: 81-86846-58-1
Abstract
The photosynthetic performance was analyzed in the common Chlorophyte, Ulva rigida in Patagonia, Argentina. A portable PAM instrument was used to measure the photosynthetic quantum yield both on site and under seminatural conditions. Solar radiation was recorded in parallel with a filter dosimeterin three wavelength ranges, UV-A, UV-B and PAR. The algae responded with photoinhibition to exposure of 15 min of solar radiation when the thalli were kept in a fixed position but recovered in the subsequent shade conditions within several hours. 30-min exposure of free floating thalli caused a less profound photoinhibition, The photosynthetic quantum yield was also determined over whole days under clear skies, partly cloudy and rainy conditions in free floating thalli in a large reservoir of water and in thalli on site growing in rock pools. While most of the effect was due to visible radiation, the UV wavelength range, and especially UV-B, considerably enhanced the decrease in photosynthetic quantum yield. Fluence rate response curves showed that the species is a typical shade plant which developed profound non-photochemical quenching at intermediate and higher irradiances. Fast induction and relaxation kinetics indicated a fast adaptation of the photosynthetic capacity to the changing light conditions as well as a fast decrease of PS II fluorescence upon exposure to solar radiation. There was negligible bleaching of chlorophylls and carotenoids due to exposure to solar radiation.
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APA:
Häder, D.-P., Lebert, M., & Helbling, E.W. (2000). Photosynthetic performance of the Chlorophyte Ulva rigida measured in Patagonia on site. In Recent research developments in photochemistry and photobiology. (pp. 259 - 269).
MLA:
Häder, Donat-Peter, Michael Lebert, and E. Walter Helbling. "Photosynthetic performance of the Chlorophyte Ulva rigida measured in Patagonia on site." Recent research developments in photochemistry and photobiology. 2000. 259 - 269.
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