Influence of Cultivation Parameters on Growth and Microcystin Production of Microcystis aeruginosa (Cyanophyceae) Isolated from Lake Chao (China) |
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Authors: | Thomas Krüger Nadine H?lzel Bernd Luckas |
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Institution: | (1) Department of Plant Physiology, Institute of General Botany and Plant Physiology, Friedrich-Schiller-University Jena, Dornburger Str. 159, 07743 Jena, Germany;(2) Department of Food Chemistry, Institute of Nutrition, Friedrich-Schiller-University of Jena, Dornburger Str. 25, 07743 Jena, Germany |
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Abstract: | Microcystis aeruginosa isolated in 2005 from the shallow eutrophic Lake Chao (Anhui, China) was investigated in terms of growth parameters and microcystin
production under varying nutrient concentrations (P, N) and pH values (abiotic factors) as well as under the influence of
spent medium of the non-toxic cyanobacterium Synechocystis sp. (biotic factors). Stimulating effects on growth were observed at the alkaline pH value (10.5), whereas toxin production
was significantly increased under phosphate-P limitation (0.6 mg L−1 medium). Within a broad range of nitrate–N concentrations (41.2–247.2 mg L−1 medium), no significant influence on cell growth and microcystin production was observed; however, N-starvation resulted
in a typical decrease of growth and toxicity. In addition, cryopreservation of M. aeruginosa evidenced the decrease of toxin production by time-dependent exposure with the cryoprotectant dimethyl sulfoxide under thawing
conditions without affecting the growth of the cyanobacterial cells. |
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