Plantactinospora mayteni gen. nov., sp. nov., a member of the family Micromonosporaceae

A novel Gram-positive, aerobic, spore-forming, endophytic actinomycete, designated strain YIM 61359^T, was isolated from the roots of Maytenus austroyunnanensis plants collected from tropical rainforest in Xishuangbanna, Yunnan Province, south-west China. The strain formed single or cluster spores with smooth surfaces from substrate mycelia. The strain contained meso-diaminopimelic acid in the cell wall and arabinose, xylose, galactose and glucose in whole-cell hydrolysates. The acyl type of the cell-wall polysaccharides was glycolyl. MK-10(H₆), MK-10(H₈) and MK-10(H₄) were the predominant menaquinones. The polar lipids were phosphatidylethanolamine, diphosphatidylglycerol, phosphatidylinositol and several unknown phospholipids. The major fatty acids were iso-C_{15 : 0}, anteiso-C_{15 : 0}, C_{17 : 0}, anteiso-C_{17 : 0} and iso-C_{16 : 0}. The DNA G+C content of strain YIM 61359^T was 69.7 mol%. These chemotaxonomic data indicated that the strain belongs to the family Micromonosporaceae. Phylogenetic analysis based on 16S rRNA gene sequences also suggested that strain YIM 61359^T fell within the family Micromonosporaceae. On the basis of morphological and chemotaxonomic data, phylogenetic analysis and characteristic patterns of 16S rRNA gene signature nucleotides, strain YIM 61359^T is considered to represent a novel species of a new genus within the family Micromonosporaceae, for which the name Plantactinospora mayteni gen. nov., sp. nov. is proposed. The type strain of Plantactinospora mayteni is YIM 61359^T (=CCTCC AA 208022^T=DSM 45238^T).