Abstract
A novel desiccation-tolerant, xeroprotectant-producing bacterium, designated strain 4J27T, was isolated from a Nerium oleander rhizosphere subjected to seasonal drought in Granada, Spain. Phylogenetic analysis based on 16S rRNA gene sequencing placed the isolate within the genus Arthrobacter, its closest relative being Arthrobacter phenanthrenivorans Shep3 DSM 18606T, with which it showed 99.23 % 16S rRNA gene sequence similarity. DNA–DNA hybridization measurements showed less than 25 % relatedness between strain 4J27T and Arthrobacter phenanthrenivorans DSM 18606T. The DNA base composition of strain 4J27T was 65.3 mol%. The main fatty acids were anteiso C15 : 0, anteiso C17 : 0, C16 : 0 and iso C16 : 0 and the major menaquinone was MK-9 (H2). The peptidoglycan type was A3α with an l-Lys–l-Ser–l-Thr–l-Ala interpeptide bridge. The bacterium tested positive for catalase activity and negative for oxidase activity. Phylogenetic, chemotaxonomic and phenotypic analyses indicated that the desiccation-tolerant strain 4J27T represents a novel species within the genus Arthrobacter, for which the name Arthrobacter siccitolerans is proposed. The type strain is 4J27T ( = CECT 8257T = LMG 27359T).
Highlights
A supplementary figure and a supplementary table are available with the online version of this paper
Among the 10 different xeroprotectants tested, the best results were observed with S4J27-D, a synthetic mixture derived from strain 4J27T (NarvaezReinaldo et al, 2010)
On the basis of the phylogenetic analysis of the 16S rRNA gene sequence together with physiological, chemotaxonomic and DNA–DNA hybridization analyses we demonstrate that strain 4J27T represents a novel species of the genus Arthrobacter
Summary
A supplementary figure and a supplementary table are available with the online version of this paper. On the basis of the phylogenetic analysis of the 16S rRNA gene sequence together with physiological, chemotaxonomic and DNA–DNA hybridization analyses we demonstrate that strain 4J27T represents a novel species of the genus Arthrobacter.
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