Iron-Reducing Microbial Communities of the Lake Baikal Low-Temperature Bottom Sediments


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Аннотация

Psychroactive enrichment cultures reducing anthraquinone 2,6-disulfonate (AQDS) and soluble complexes of ferric iron at 5–20°C were isolated from the samples of Lake Baikal bottom sediments collected at the depths of 404 to 1396 m. Cultivation resulted in production of up to 6 mM Fe(II), which was over 50% of the initial Fe(III) concentration in the medium, and of 5.5 mM AH2QDS (~30% of the initial quinone concentration). The enrichment culture of iron-reducing bacteria St3 used Fe(III) citrate as the terminal electron acceptor, oxidizing formate from 6.5 to 2.0 g L–1 at 15°C. Phylogenetic analysis showed that the initial samples of the Lake Baikal bottom sediments and the enrichments obtained from these samples contained the taxa of classes Alpha- and Betaproteobacteria, which were closely related to bacteria capable of oxidizing aromatic compounds using inorganic electron acceptors, including ferric iron.

Авторлар туралы

A. Zakharyuk

Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: kuran82@mail.ru
Ресей, Pushchino, 142290

Ya. Ryzhmanova

Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences

Email: kuran82@mail.ru
Ресей, Pushchino, 142290

A. Avtukh

Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences

Email: kuran82@mail.ru
Ресей, Pushchino, 142290

V. Shcherbakova

Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences

Email: kuran82@mail.ru
Ресей, Pushchino, 142290

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