Algicidal activity of a dibenzofuran-degrader Rhodococcus sp.

Journal of microbiology and biotechnology (2013-02-16)
Meng-Hui Wang, Peng Peng, Yu-Mei Liu, Rui-Bao Jia, Li Li
ABSTRACT

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 7.7×10(7) CFU/ml, 93.5% of exponentially growing Microcystis aeruginosa (7.3×10(6) cells/ml initially) was inhibited after 4 day. The threshold concentration for its algicidal activity against M. aeruginosa was 7.7×10(6) 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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
L-Pyroglutamic acid, ≥99.0% (T)
Sigma-Aldrich
L-Pipecolic acid, 99% (titration)
Sigma-Aldrich
Pipecolinic acid, 98%
Sigma-Aldrich
Dibenzofuran, 98%
Sigma-Aldrich
3-Indoleacrylic acid, BioReagent, ≥98% (HPLC)
Sigma-Aldrich
trans-3-Indoleacrylic acid, 98%
Sigma-Aldrich
L-Pyroglutamic acid, BioXtra
Sigma-Aldrich
3-Indoleacrylic acid, powder
Sigma-Aldrich
D-Pipecolinic acid, 99%
Sigma-Aldrich
L-Pipecolic acid, Proline homolog., 99%
Supelco
Dibenzofuran, analytical standard
Dibenzo[b,d]furan, BCR®, certified reference material

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