The influence of hexavalent chromium salt on the population growth, cell morphology, and physiological parameters of the benthic microalga Attheya ussurensis Stonik, Orlova, Crawford, 2006 (BACILLARIOPHYTA) in culture

The influence of hexavalent chromium salt on the population growth, cell morphology, and... The presence of hexavalent chromium salt in culture medium negatively affected the growth dynamics and physiological parameters of the benthic microalga Attheya ussurensis. After 1 day of exposure to toxicant at concentrations of 2, 4, 7, and 10 mg/l, the cell counts were 10, 7.9, 5.6, and 4.3 × 103 cells/ml, respectively (versus 13 × 103 cells/ml in the control). A tendency towards a decrease in cell number remained until the end of the experiments; after 7 days of exposure the cell counts were 133, 102, 11, and 7.5 × 103 cells/ml (versus 204 × 103 cells/ml in the control). With increase in potassium bichromate concentration in the culture medium, there was an increase in the ratio of cell height to width and a change in the form of the cell to horseshoe shaped. The contents of chlorophyll a in microalgal cells after 1 day of exposure to 2, 4, 7, and 10 mg/l were 40, 37, 34, and 30 μg/l, respectively (45 μg/l in the control). After 7 days, at chromium salt concentrations of 2 and 4 mg/l, the chlorophyll a content was higher (670 and 647 μg/l) than in the control (605 μg/l); at 7 and 10 mg/l, it significantly decreased to 87 and 65 μg/l, respectively. The contents of carotinoids in microalgal cells after 7 days of exposure to 2 and 4 mg/l were comparable to the control values, while at 7 and 10 mg/l they decreased sharply. The amount of phaeophytin (as a percentage of total chlorophyll a content) increased with increasing potassium bichromate concentration. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

The influence of hexavalent chromium salt on the population growth, cell morphology, and physiological parameters of the benthic microalga Attheya ussurensis Stonik, Orlova, Crawford, 2006 (BACILLARIOPHYTA) in culture

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074011040031
Publisher site
See Article on Publisher Site

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