Micromonospora phytophila sp. nov. and Micromonospora luteiviridis sp. nov., Isolated as Natural Inhabitants of Plant Nodules

Abstract

Two actinobacterial isolates, strains SG15T and SGB14T, were recovered through a microbial diversity study of nitrogen fixing nodules from Pisum sativum plants collected in Salamanca (Spain). The taxonomic status of these isolates was determined using a polyphasic approach and both presented chemotaxonomic and morphological properties consistent with their classification in the genus Micromonospora. For strains SG15T and SGB14T, the highest 16S rRNA gene sequence similarities were observed with Micromonospora coxensis JCM 13248T (99.2 %) and Micromonospora purpureochromogenes DSM 43821T (99.4 %), respectively. However, strains SG15T and SGB14T were readily distinguished from their phylogenetic neighbours both genetically and phenotypically indicating that they represent two new Micromonospora species. The following names are proposed for these species: Micromonospora phytophila sp. nov. type strain SG15T (=CECT 9369T; =DSM 105363T), and Micromonospora luteiviridis sp. nov. type strain SGB14T (=CECT 9370T; =DSM 105362T). © 2018 IUMS.