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Selenium accumulation and the growth of cyanobacterium Spirulina platensis (Nordst.) Geitl. were studied in a culture with sodium selenite-supplemented nutritional medium. Selenite concentrations below 20 mg/l did not inhibit the growth of S. platensis. The addition of 30 mg/l of this salt somewhat decreased the growth rate during the linear growth phase, induced the earlier suspension transition to the steady-state phase, and substantially lowered the highest optical density of the suspension. However, even at 170 mg/l Na2SeO3, the culture still demonstrated a capacity for growth. The content of selenium in the cells depended directly on its concentration in the medium, up to the lethal level. At high selenium concentrations (100–170 mg/l), S. platensis reduced Se(IV) up to Se(0). The latter was secreted onto the cell surface and into the cultural medium. The high concentrations of Na2SeO3 acidified the cytoplasmic pH as was measured by 31P-NMR spectroscopy. At the same time, the content of protein on a dry weight basis decreased and that of carbohydrates and lipids somewhat increased, just as was observed in S. platensis cells under other stress factors. In the presence of 20 mg/l Na2SeO3, the selenium content in the biomass increased by 20 000 times as compared to that in the control cells, whereas the biochemical composition of biomass did not change. In this case, the selenium was incorporated almost completely in the protein fraction. The selenium concentration in this fraction increased more significantly when the sulfur content was lowered in the medium.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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