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ISSN Печать: 1521-9429
ISSN Онлайн: 1940-4328
Indexed in
The Combined Influence of Light Intensity and Temperature on Organic Carbon to Chlorophyll α Ratio in Three Species of Marine Bacillariophyta
Краткое описание
The combined effect of light and temperature on change in the intracellular ratio of organic carbon to chlorophyll α (C : chl. α) was studied in three species of diatoms: Phaeodactylum tricornutum Bohlin, Nitzschia sp. 3, and Skeletonema costatum Cleve. At the optimum temperature of 20°C value of the C : chl. α ratio varies from 15 to 60−70 all over the studied light range in Ph. Tricornutum and Nitzschia sp. 3, and up to 350 µE·m−2·s−1 in S. costatum. The dependence of this ratio on light is described by a hyperbolic curve. Temperature decrease results in an increase in the C : chl. α ratio in algal cells and increases the initial tangent of the slope of the C : chl. α ratio curve. Inhibiting light combined with low temperature caused a decrease in the functional activity of algae, a decrease in the rate of synthesis of chl. α against the background of its enhanced photo-oxidation and, as a consequence, a sharp increase of the C : chl. α ratio. All studied diatom species are characterized by similar nature of light and temperature dependence of C: chl. α; however, in S. costatum the curve of C : chl. α ratio formed the plateau at lower light intensities, while photo-oxidation of chlorophyll took place with an increase in luminance.
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Kovalyova Ilona V., Finenko Zosim Z., Quantitative regularities of changes in the relative content of chlorophyll at the joint action of light and temperature in diatoms, Issues of modern algology (Вопросы современной альгологии), 2019. Crossref