1887

Abstract

Eleven novel strains of marine-inhabiting lactic acid bacteria that were isolated from living and decaying marine organisms collected from a temperate area of Japan are described. The isolates were motile with peritrichous flagella and non-sporulating. They lacked catalase, quinones and cytochromes. Fermentation products from glucose were lactate, formate, acetate and ethanol. Lactate yield as percentage conversion from glucose was affected by the pH of the fermentation medium: ∼55 % at the optimal growth pH of 8·0, greater than ∼70 % at pH 7·0 and less than ∼30 % at pH 9·0. The molar ratio of the other three products was the same at each cultivation pH, approximately 2 : 1 : 1. Carbohydrates and related compounds were aerobically metabolized to acetate and pyruvate as well as lactate. The isolates were slightly halophilic, highly halotolerant and alkaliphilic. The optimum NaCl concentration for growth was 2·0–3·0 % (w/v), with a range of 0–25·5 %. The optimum pH for growth was 8·0–9·5, with a range of 6·0–10·0. The G+C content of the DNA was 38·5–40·7 mol%. The isolates constituted two genomic species (DNA–DNA relatedness of less than 41 %) each characterized by sugar fermentation profiles. The cell-wall peptidoglycan of both phenotypes contained -diaminopimelic acid. The major cellular fatty acids were C and a-C. Comparative sequence analysis of the 16S rRNA genes revealed that these isolates represent novel species constituting a phylogenetic unit outside the radiation of typical lactic acid bacteria and an independent line of descent within the group composed of the halophilic/halotolerant/alkaliphilic and/or alkalitolerant species in rRNA group 1, with 94·8–95·1 % similarity to the genus , 93·7–94·1 % to the genus and 93·8–94·2 % to . On the basis of possession of physiological and biochemical characteristics common to typical lactic acid bacteria within rRNA group 1, chemotaxonomic characteristics and phylogenetic independence, a new genus and two species, gen. nov., sp. nov. and sp. nov., are proposed. The type strains are M2-2 (=DSM 17073=IAM 15242=NBRC 100868=NRIC 0628) (G+C content 40·2 mol%) and M23-1 (=DSM 17074=IAM 15247=NBRC 100873=NRIC 0633) (G+C content 38·5 mol%).

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2005-11-01
2019-10-18
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