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KMID : 0545120130230020260
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Journal of Microbiology and Biotechnology
2013 Volume.23 No. 2 p.260 ~ p.266
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Algicidal Activity of a Dibenzofuran-Degrader Rhodococcus sp.
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Meng-Hui Wang
Peng Peng
Yu-Mei Liu
Rui-Bao Jia
Li Li
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Abstract
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Rhodococcus sp. strain p52, a previously isolated dibenzofuran degrader, could effectively inhibit the growth of cyanobacteria, including species of Microcystis, Anabaena, and Nodularia. When strain p52 was inoculated at the concentration of 7.7×107 CFU/ml, 93.5% of exponentially growing Microcystis aeruginosa (7.3×106 cells/ml initially) was inhibited after 4 day. The threshold concentration for its algicidal activity against M. aeruginosa was 7.7×106 CFU/ml. Strain p52 exerted algicidal effect by synthesizing extracellular substances, which were identified as trans-3-indoleacrylic acid, DL-pipecolic acid, and L-pyroglutamic acid. The effective concentrations of trans-3-indoleacrylic acid and DL-pipecolic acid against M. aeruginosa were tested to be 0.5 mg/l and 5 mg/l, respectively.
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KEYWORD
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Anticyanobacterial activity, cyanobacteria, Microcystis aeruginosa, Rhodococcus, extracellular products
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