Streptacidiphilus oryzae sp. nov., an actinomycete isolated from rice-field soil in Thailand

Abstract

The taxonomic position of ten acidophilic actinomycetes isolated from an acidic rice-field soil was established using a polyphasic approach. 16S rRNA gene sequences determined for the isolates were aligned with corresponding sequences of representatives of the generaKitasatospora,StreptacidiphilusandStreptomycesand phylogenetic trees were inferred using four tree-making algorithms. The isolates had identical sequences and formed a distinct branch at the periphery of theStreptacidiphilus16S rRNA gene tree. The chemotaxonomic and morphological properties of representative isolates were consistent with their assignment to the genusStreptacidiphilus. The isolates shared nearly identical phenotypic profiles that readily distinguished them from representatives of the established species ofStreptacidiphilus. It is evident from the genotypic and phenotypic data that the isolates form a homogeneous group that corresponds to a novel species in the genusStreptacidiphilus. The name proposed for this new taxon isStreptacidiphilus oryzaesp. nov.; the type strain is strain TH49T(=CGMCC 4.2012T=JCM 13271T).