Massilia Cellulosiltytica Sp. Nov., A Novel Cellulose-degrading Bacterium Isolated from Rhizosphere Soil of Rice (Oryza Sativa L.) and whole Genome Analysis

Abstract

A bacterial strain, Gram-stain negative, rod-shaped, aerobic and cellulose-degrading, designated NEAU-DD11T, was isolated from rhizosphere soil of rice collected from Northeast Agricultural University in Harbin, Heilongjiang province, North-east China. Base on 16S rRNA gene sequence analysis, strain NEAU-DD11T belongs to the genus Massilia and shared high sequence similarities with Massilia phosphatilytica 12-OD1T (98.46 %) and Massilia putida 6NM-7T (98.41 %). Phylogenetic analysis based on the 16S rRNA gene and whole genome sequences indicated that strain NEAU-DD11T formed a stable cluster with M. phosphatilytica 12-OD1T and M. putida 6NM-7T. The major fatty acids of the strain were C16:0, C17:0-cyclo and C16:1ω7c. The respiratory quinone was Q-8. The polar lipids profile of the strain showed the presence of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, an unidentified polar lipid and an unidentified phospholipid. In addition, the digital DNA-DNA hybridization values between strain NEAU-DD11T and M. phosphatilytica 12-OD1T and M. putida 6NM-7T were 45.4% and 35.6%, respectively, which are lower than the accepted threshold value of 70%. The DNA G + C content of strain NEAU-DD11T was 66.2 %. The whole genome analysis showed the strain contained carbohydrate enzymes such as glycoside hydrolase and polysaccharide lyase, which enabled the strain to had the function of degrading cellulose. On the basis of the phenotypic, genotypic and chemotaxonomic characteristics, strain NEAU-DD11T represents a novel species of the genus Massilia, for which the name Massilia cellulosiltytica sp. nov. is proposed. The type strain is NEAU-DD11T (= CCTCC AB 2019141T = DSM 109721T).