Abstract
Variations in the photosynthetic activity under monochromatic light was studied in Phaeodactulum tricornutum grown under various culture conditions, with special reference to the composition of photosynthetic pigments. Photosynthetic activity, under light-limiting conditions, was reduced when the cells were grown under strong light. The reduction was more extensive in activity resulting from fucoxanthin-excitation than in that from chlorophyll a-excitation. The diminution in activity for fucoxanthin-excited photosynthesis did not correlate with variations in the pigment content. A similar diminution was observed with chlorophyll a fluorescence upon excitation of fucoxanthin. The change was accelerated by lowering the culture temperature, or limiting the supply of nitrogen source. The results were interpreted in terms of a nitrogen-deficient state for algal cells induced by strong light, low temperature or a limited supply of nitrogen. This leads to a modification of the physicochemical state of in vivo fucoxanthin, so that the excitation energy of fucoxanthin is less efficiently transferred to chlorophyll a. The significance of the phenomenon in the oceanic primary production is discussed.
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Communicated by M. Anraku, Nagasaki
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Shimura, S., Fujita, Y. Changes in the acitivy of fucoxanthin-excited photosynthesis in the marine diatom Phaeodactylum tricornutum grown under different culture conditions. Marine Biology 33, 185–194 (1975). https://doi.org/10.1007/BF00390922
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DOI: https://doi.org/10.1007/BF00390922