Abstract
An algalytic bacterium provisionally designated as TL1 was isolated from Tai Lake, a large freshwater lake in the Yangtze Delta plain on the border of the Jiangsu and Zhejiang provinces and close to Wuxi city in the People’s Republic of China. Strain TL1 was identified as Achromobacter sp. based on its biophysical and biochemical properties and the analysis of its 16S rRNA sequence. Microcystis aeruginosa, which is the most common toxic cyanobacterium in eutrophic freshwater, could be decomposed by strain TL1. The results showed that after inoculation with the algalytic bacterium, the content of chlorophyll-a, maximum PSII quantum yield, and maximum electron transport rates of the alga decreased sharply. At first, the algal cells enhanced the activities of some antioxidative enzymes, but subsequently, the activities of antioxidative enzymes fell sharply once damage of the algal cells was achieved. The filtrate from strain TL1 culture suspension, after autoclaving and treatments with proteinase K, strongly inhibited algal growth, indicating that the lytic metabolites were extracellular and thermostable, not a protein.
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Acknowledgments
This work was supported by Open Fund of the Key Laboratory of Applied Marine Biotechnology, Jiangsu Province (JSMK2008-004) and a grant from the National Natural Science Foundation of China (no. 30600086). The authors would like to thank Prof. Joseph Baker of Australian Institute of Marine Sciences for the editing of this manuscript.
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Wang, H., Liu, L., Liu, Z.P. et al. Investigations of the characteristics and mode of action of an algalytic bacterium isolated from Tai Lake. J Appl Phycol 22, 473–478 (2010). https://doi.org/10.1007/s10811-009-9481-2
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DOI: https://doi.org/10.1007/s10811-009-9481-2