COMPARATIVE STUDIES ON PHYSIOLOGICAL RESPONSES AT PHOSPHORUS STRESS OF THREE WATERBLOOM FORMING CYANOBACTERIA

TAN Xiang; SHEN Hong; SONG Li-Rong

Volume 31 Issue 5

Aug. 2014

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ACTA HYDROBIOLOGICA SINICA > 2007 > 31(5): 693-699.

TAN Xiang, SHEN Hong, SONG Li-Rong. COMPARATIVE STUDIES ON PHYSIOLOGICAL RESPONSES AT PHOSPHORUS STRESS OF THREE WATERBLOOM FORMING CYANOBACTERIA[J]. ACTA HYDROBIOLOGICA SINICA, 2007, 31(5): 693-699.

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COMPARATIVE STUDIES ON PHYSIOLOGICAL RESPONSES AT PHOSPHORUS STRESS OF THREE WATERBLOOM FORMING CYANOBACTERIA

State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, the Chinese Academy of Sciences, Wuhan 430072;
2. Graduate School of the Chinese Academy of Sciences, Beijing 100049

Received Date: October 26, 2005
Rev Recd Date: December 29, 2006
Published Date: September 24, 2007

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Abstract

In this paper, the physiological responses of the three waterbloom2forming cyanobacteria (Microcystis aeruginosa FACHB469, Anabaena flos-aquae FACHB245 and Oscillatoria planctonica FACHB708) at phosphorus limitation in stationary cultures were studied. The phosphorus uptake rate is hyperbolic correlated to the extracellular nutrient concentration as described by the Michaelis2Menten equation. Kmfor phosphorus of M. aeruginosa, A. flos-aquae and O. planctonica was 81260, 21199 and 41926, respectively, which indicated that the tolerant ability to the phosphorus stress was in the decreasingorder of A. flos-aquae, O. planktonica and M. aeruginosa in the phosphorus deficient condition. The capacity to luxuriously uptake phosphorus of M. aeruginosa was higher than that of O. planctonica and A. flos-aquae. This result was consistent with the phosphorus uptake kinetics experimentsof the three cyanobacteria. Alkaline phosphatase acitivity (APA) of cyanobacteria were inversely correlated with external phosphorus concentration. The APA was obviously promoted under phosphorus deficiency stress. The capacity of excreting AP in the three cyanobacteria was significantly different under the same phosphorus limited conditions (A. flos-aquae > O. planctonica > M. aeruginosa). Extracellular APA of A. flosaquae was 10 and 5 times higher than that of M. aeruginosa and O. planctonica, respectively, when they were cultured in phosphorus deficient condition. The studies compared phosphorus uptake kinetics and capacityof excreting AP in the three cyanobacteria, which would help to understand the population succession of cyanobacteria in the environmental waterbodies.
- Waterbloom-forming cyanobacteria,
- Phosphorus-limited stress,
- Growth,
- Phosphorus uptake,
- Alkaline phosphatase

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COMPARATIVE STUDIES ON PHYSIOLOGICAL RESPONSES AT PHOSPHORUS STRESS OF THREE WATERBLOOM FORMING CYANOBACTERIA

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