Streptomyces durocortorensis sp. nov., isolated from oak rhizosphere
Abstract
Strain RHZ10 T was isolated from an oak rhizosphere sampled in Reims, France, and characterized to assess its taxonomy. Based on 16S rRNA gene sequence similarity, strain RHZ10 T was affiliated to the genus Streptomyces and the closest species were Streptomyces anulatus NRRL B-2000 T and Streptomyces pratensis ch24 T . Average nucleotide identity and digital DNA–DNA hybridization values were 77.3–92.4 % and 23.0–50.9 %, respectively, when compared to the type strains of fully sequenced related species having a 16S rRNA gene sequence similarity over 98 %. These data suggested that strain RHZ10 T represented a novel species within the genus Streptomyces . The genome of RHZ10 T was 8.0 Mbp long, had 7 894 predicted coding genes, and a G+C content of 71.7 mol%. Cultures of RHZ10 T on ISP 2 medium mostly led to the production a green pigmentation of the core of its colonies in the vegetative mycelium, surrounded by white pigmentation of the aerial mycelium. The main fatty acids of RHZ10 T were anteiso-C 15 : 0 , iso-C 16 : 0 , anteiso-C 17 : 0 and C 16 : 0 . Polar lipids were phosphatidylethanolamine, diphosphatidylglycerol, unidentified lipids, unidentified phospholipids, unidentified aminolipids and unidentified glycolipids. Its main quinones were MK-9(H 6 ) (69.3 %), MK-9(H 4 ) (17.3 %) and MK-9(H 8 ) (17.0%). Phylogenetic, physiological and chemotaxonomic studies clearly supported that strain RHZ10 T represents a novel species within the genus Streptomyces , for which the name Streptomyces durocortorensis sp. nov. is proposed and the type strain is RHZ10 T (=DSM 112634 T =LMG 32187 T =CIP 111907 T ).
