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The chromatic adaptation of c- phycoerythrin -containing cyanobacteria Synechococcus sp. (Black Sea)

Published in «Water: chemistry and ecology» № 4-6 / 2018 , p. 106-115.
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Efimova T.V.
Churilova T.Ya.
Muhanov V.S.
Sahon E.G.

Summary:
Effect of light of different spectral composition on the structural and functional characteristics of cyanobacteria, which are an important component of the aquatic environment and determine water quality, has been investigated. The experiments with the strain of cyanobacteria Synechococcus sp. BS9001 have shown no changes in the ratio between chlorophyll a and accessory pigments typical for complementary chromatic adaptation. The growth rate increased when the cells were growing under the color light (green light) spectral features of which were complementary to the C-phycoerythrin absorbance band, and decreased when cells were adapted to the color light with spectral features not coincided with the C-phycoerythrin absorbance band. The investigations curried out in the Black Sea have shown that during the seasons when water column was stratified the abundance of picocyanobacteria increased with depth being maximal in the phytoplankton community existing in the water layer under the seasonal thermocline. For this deep phytoplankton community it was obtained that pigment absorption spectra had local maximum at ~ 550 nm, which was likely to be related to C-phycoerythrin containing picocyanobacteria Synechococcus sp. Coincidence of C-phycoerythrin absorbance with the spectral features of radiance penetrating to the euphotic zone bottom could cause high abundance of C-phycoerythrin containing picoplankton Synechococcus sp. below the thermocline.

Keywords: Synechococcus sp. BS9001– рicocyanobacteria - spectral features of radiation – pigments

Bibliographic link:
Efimova T.V., Churilova T.Ya. , Muhanov V.S., Sahon E.G. The chromatic adaptation of c- phycoerythrin -containing cyanobacteria Synechococcus sp. (Black Sea) // Water: chemistry and ecology. — 2018. — № 4-6. — c. 106-115. — http://watchemec.ru/en/article/28945/

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