Verrucosispora endophytica sp. Nov., isolated from the root of wild orchid (Grosourdya appendiculata (Blume) Rchb.f.)

Abstract

A novel endophytic filamentous bacterium strain A-T 7972T, was isolated from wild orchid Grosourdya appendiculata (Blume) Rchb.f. collected in Thailand. The bacterium developed single non-motile spores with warty surface on substrate mycelia. The taxonomic position was described using a polyphasic approach. The 16S rRNA gene sequence and phylogenetic analysis indicated that strain A-T 7972T belonged to the genus Verrucosispora and shared the highest sequence similarity with V. lutea YIM 013T (98.71 %) and V. gifhornensis DSM 44337T (98.53 %). The values of DNA–DNA relatedness that distinguished this novel strain from its closest species were below 70 %. The cell-wall peptidoglycan contained meso-diaminopimelic acid. The whole-cell sugars were mannose, ribose, glucose and xylose. The predominant menaquinone was MK-9(H4). The predominant fatty acids were branched fatty acids iso-C15: 0 and iso-C16: 0. The diagnostic phospholipids profile consisted of phosphatidylethanolamine, diphosphatidylglycerol, phosphatidylinositol and phosphatidylinositol mannosides. The G+C content of the genomic DNA was 70.5 mol%. Based on its phenotypic, chemotaxonomic and genotypic characteristics, the new isolate A-T 7972T (=BCC 50981T=TBRC 6031T=NBRC 112512T) is proposed to be the type strain of novel species, Verrucosispora endophytica sp. nov. © 2017 IUMS.