Saccharopolyspora oryzae sp. nov., isolated from rhizosphere soil of the wild rice species Oryza rufipogon.

A novel actinobacterium, designated as strain WRP15-2, was isolated from rhizosphere soil of rice plant (Oryza rufipogon). The strain was Gram-stain-positive, aerobic, and non-motile. Phylogenetic analysis based on the 16S rRNA gene sequences showed that strain WRP15-2 fell into the genus Saccharopolyspora. The strain shared the highest 16S rRNA gene sequence similarity with the type strains Saccharopolyspora kobensis JCM 9109 (99.1%), Saccharopolyspora indica VRC122 (98.9%), and Saccharopolyspora antimicrobica DSM 45119 (98.7%). However, the digital DNA-DNA hybridization and average nucleotide identity values among these strains confirmed that the microorganism represented a novel member of the genus Saccharopolyspora. Chemotaxonomic data revealed that strain WRP15-2 possessed MK-9(H) as the predominant menaquinone. It contained meso-diaminopimelic acid as the diagnostic diaminopimelic acid and arabinose, galactose, and ribose as predominant whole-cell sugars. The detected phospholipids were dominated by phosphatidylethanolamine, hydroxy-phosphatidylethanolamine, phosphatidylmethylethanolamine, hydroxy-phosphatidylmethylethanolamine, and phosphatidylcholine. The predominant cellular fatty acids were iso-C, C, and iso-C. The G + C content of the genomic DNA was 69.5%. Based on these genotypic and phenotypic data, it is supported that strain WRP15-2 represents a novel species of the genus Saccharopolyspora, for which the name Saccharopolyspora oryzae sp. nov. is proposed. The type strain is WRP15-2 ( = TBRC 15728 = NBRC 115560).