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Actinomycetospora soli sp. nov., isolated from the rhizosphere soil of Averrhoa carambola L.

A novel actinobacterium, designated strain SF1T, was isolated from the rhizosphere soil of a star fruit plant (Averrhoa carambola L.) collected from Bangkok, Thailand, and its taxonomic position was evaluated. The strain showed morphological, chemotaxonomic and phylogenetic characteristics consistent with its classification in the genus Actinomycetospora. Strain SF1T was an aerobic, Gram-stain-positive and non-motile actinobacterium. Growth occurred at 15-35 °C, at pH 4.0-12.0 and in the presence of 0-10 % (w/v) NaCl. The 16S rRNA gene sequence of strain SF1T showed the highest similarity to Actinomycetospora chiangmaiensis YIM 0006T (99.5 %), Actinomycetospora corticicola 014-5T (98.8 %) and Actinomycetospora endophytica A-T 8314T (98.8 %). The genome sequencing revealed a genome size of 6.52 Mbp and a DNA G+C content of 74.0 %. In addition, the average nucleotide identity values between strain SF1T and reference strains, A. chiangmaiensis DSM 45062T, A. corticicola DSM 45772T and A. endophytica TBRC 5722T, were found to be 86.1, 86.5 and 79.7 %, respectively, and the level of digital DNA-DNA hybridization between them were 32.4, 32.4 and 23.3 %, respectively. The whole-cell hydrolysates of strain SF1T contained meso-diaminopimelic acid as the diagnostic diamino acid, with arabinose, galactose, glucose and ribose as whole-cell sugars. The predominant menaquinone was MK-8(H4). Major cellular fatty acids were iso-C16 : 0 and a summed feature consisting of C16 : 1 ω6c/C16 : 1 ω7c. Characterization based on chemotaxonomic, phylogenetic, phenotypic and genomic evidence demonstrated that strain SF1T represents a novel species of the genus Actinomycetospora, for which the name Actinomycetospora soli sp. nov. is proposed. The type strain is strain SF1T (=TBRC 15166T= NBRC 115295T).