Streptomyces geldanamycininus Z374 – a novel strain with biocidal activity against cyanobacteria
T.B. Zaytseva, V.I. Safronova, N.G. Medvedeva
Section: Remediation and rehabilitation
The mass development of cyanobacteria causing the “bloom” of water in water bodies, leads to a significant deterioration in the quality of water and the environment of coastal areas, causes great economic losses and poses serious ecological
problems. Among the known methods eliminating the growth of cyanobacteria biological method has been recognized as
the most efficient and ecologically sound method. As a result of the screening of soil actinobacteria, the strain Z374, producing metabolites with biocide activity against cyanobacteria was isolated. Based on the complex of phenotypic traits and the
results obtained by sequencing a fragment of the 16S rRNA gene sequence, we identified the isolate Z374 as Streptomyces
geldanamycininus and deposited it in the Departmental Collection of Agricultural Microorganisms of the All-Russia Research Institute for Agricultural Microbiology under registration number RCAM 05297. The rrs sequence of the isolate
S. geldanamycininus Z374 (RCAM05297) gene was deposited in the GenBank database under the number MT437400. Analysis of the UV absorption spectrum of a 1% methanol solution of crude biocide (CB) Z374 isolated from the cells of
S. geldanamycininus Z374 suggested the presence of at least 2 compounds in its composition, one of which has the heptaene
structure. Сrude biocide Z374 inhibits the growth of bloom-forming cyanobacteria Aphanizomenon flos-aquae, Microcystis
aeruginosa, Nodularia spumigena, Planktothrix agardhii and causes a decrease in the content of microcystins in the cells of
the toxic cyanobacteria Microcystis aeruginosa and Planktothrix agardhii and a decrease in the total toxins concentrations
in the medium. The presented work is the first report on the biocidal activity of soil actinobacterium S. geldanamycininus
against cyanobacteria. The obtained results showed that the CB Z374 synthesized by S. geldanamycininus can be considered
as a potential regulator of the mass development of bloom-forming cyanobacteria including toxic ones.
ISSN 1995-4301
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