Isolation and characterization of an algicidal bacterium indigenous to lake Taihu with a red pigment able to lyse microcystis aeruginosa / 生物医学与环境科学(英文)
Biomedical and Environmental Sciences
; (12): 148-154, 2013.
Article
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| WPRIM
| ID: wpr-320357
Responsable en Bibliothèque :
WPRO
ABSTRACT
<p><b>OBJECTIVE</b>To isolate and characterize indigenous algicidal bacteria and their algae-lysing compounds active against Microcystis aeruginosa, strains TH1, TH2, and FACHB 905.</p><p><b>METHODS</b>The bacteria were identified using the Biolog automated microbial identification system and 16S rDNA sequence analysis. The algae-lysing compounds were isolated and purified by silica gel column chromatography and reverse-phase high performance liquid chromatography. Their structures were confirmed by Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared (FT-IR) spectroscopy. Algae-lysing activity was observed using microscopy.</p><p><b>RESULTS</b>The algae-lysing bacterium LTH-2 isolated from Lake Taihu was identified as Serratia marcescens. Strain LTH-2 secreted a red pigment identified as prodigiosin (C20H25N3O), which showed strong lytic activity with algal strains M. aeruginosa TH1, TH2, and FACHB 905 in a concentration-dependent manner. The 50% inhibitory concentration (IC50) of prodigiosin with the algal strains was 4.8 (± 0.4)× 10⁻² μg/mL, 8.9 (± 1.1)× 10⁻² μg/mL, and 1.7 (± 0.1)× 10⁻¹ μg/mL in 24 h, respectively.</p><p><b>CONCLUSION</b>The bacterium LTH-2 and its pigment had strong Microcystis-lysing activity probably related to damage of cell membranes. The bacterium LTH-2 and its red pigment are potentially useful for regulating blooms of harmful M. aeruginosa.</p>
Texte intégral:
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Indice:
WPRIM
Sujet Principal:
Pharmacologie
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Phylogenèse
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Bactéries
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Lacs
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Classification
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Microcystis
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Génétique
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Métabolisme
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Antibactériens
langue:
En
Texte intégral:
Biomedical and Environmental Sciences
Année:
2013
Type:
Article