The role of peridinin-chlorophyll a-proteins in the photosynthetic light adaption of the marine dinoflagellate,Glenodinium sp. |
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Authors: | Barbara B. Prézelin |
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Affiliation: | (1) Scripps Institution of Oceanography, University of California, 92093 San Diego, California, USA;(2) Present address: Department of Biological Sciences, University of California, 93106 Santa Barbara, California |
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Abstract: | Summary The marine dinoflagellate, Glenodinium sp., was cultured at a series of light levels and growth, pigmentation, and photosynthetic rates were compared. Under decreasing light conditions, growth rates decreased, cellular chlorophyll a and peridinin content per cell increased, and maximum cellular photosynthetic rates remained unchanged. Pigmentation changes were related to alterations in cellular concentrations of a peridinin-chlorophyll a-protein and an unidentified chlorophyll a component of the chloroplast membrane. Maintenance of photosynthetic rates with decreased irradiance is interpreted as an increase in the number of pigment molecules in the light-harvesting antenna associated with the reaction centers of the photosynthetic apparatus, thus increasing the potential for photon capture for photosynthesis.Abbreviations ASP 7 medium see Provasoli, 1963 - PCP peridinin-chlorophyll a-protein - PSU photosynthetic unit - P-I photosynthesis-irradiance curve - TLC thin layer chromatography - A optical absorbance at a designated wavelength - SIO (F.T. Haxo) Scripps Institution of Oceanography collectionThis paper represents a portion of a thesis submitted in partial satisfaction of the requirements for the degree Doctor of Philosophy from the University of California, San Diego |
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