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Changes in the fatty acid composition of symbiotic dinoflagellates from the hermatypic coral Echinopora lamellosa during adaptation to the irradiance level

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Abstract

The composition of fatty acids (FAs) of symbiotic dinoflagellates isolated from the hermatypic coral Echinoporal lamellosa adapted to the irradiance of 95, 30, 8, and 2% PAR was studied. Polar lipids and triacylglycerols (TAG) differed between them in FA composition. Polar lipids were enriched in unsaturated FAs, whereas TAG, in saturated FAs. Light exerted a substantial influence on the FA composition in both polar lipids and TAG. The elevation of irradiance resulted in the accumulation of 16:0 acid in both lipid groups and 16:1(n-7) acid in TAG. It seems likely that de novo synthesis of 16:0 acid occurred actively in the cells of symbiotic dinoflagellates in high light. Since these processes are energy-consuming ones, they utilize excessive energy. When light intensity declined, 18:4(n-3) and 20:5(n-3) acids accumulated in polar lipids, which was accompanied by the increase in the content of chlorophyll a in the cells of zooxanthellae, whereas the levels of 22:6(n-3) and 20:4(n-6) acids reduced. Although the relative content of particular FAs varied substantially in dependence of irradiance, the balance between the sum of saturated and unsaturated FAs changed insignificantly. We concluded that the role of photoadaptation could not be limited only to changes in the degree of lipid unsaturation and membrane fluidity. It is supposed that light-induced changes in the FA composition reflect the interrelation between photosynthesis and FA biosynthesis.

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Abbreviations

FA:

fatty acid

FAME:

FA methyl esters

PAR:

photosynthetically active radiation

R t :

retention time

SD:

symbiotic dinoflagellates

TAG:

triacylglycerols

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Authors and Affiliations

  1. Institute of Marine Biology, Far-East Division, Russian Academy of Sciences, ul. Pal’chevskogo 17, Vladivostok, 690041, Russia

    N. V. Zhukova

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Correspondence to N. V. Zhukova.

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Original Russian Text © N.V. Zhukova, 2007, published in Fiziologiya Rastenii, 2007, Vol. 54, No. 6, pp. 856–863.

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Zhukova, N.V. Changes in the fatty acid composition of symbiotic dinoflagellates from the hermatypic coral Echinopora lamellosa during adaptation to the irradiance level. Russ J Plant Physiol 54, 763–769 (2007). https://doi.org/10.1134/S1021443707060076

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  • DOI: https://doi.org/10.1134/S1021443707060076

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