Cellulomonas triticagri sp. nov., isolated from the rhizosphere soil of wheat (Triticum aestivum L.)

A Gram-positive, motile, rod-shaped and lignin-degrading novel actinomycete, designated strain NEAU-YY56^T, was isolated from the rhizosphere soil of wheat (Triticum aestivum L.) collected from Zhumadian, Henan Province, Central China and characterized using a polyphasic approach. Phylogenetic analysis based on the 16S rRNA gene sequence indicated that strain NEAU-YY56^T belonged to the genus Cellulomonas and exhibited 16S rRNA gene sequence similarities of 98.7, 98.2 and 98.1% to Cellulomonas pakistanensis JCM 18755^T, Cellulomonas denverensis JCM 14733^T and Cellulomonas hominis JCM 12133^T, respectively. The whole-cell sugars were glucose, rhamnose and ribose. The peptidoglycan of strain NEAU-YY56^T contained ornithine and glutamic acid. The phospholipid profile was found to contain diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol mannoside and two unknown glycolipids. The major menaquinone was MK-9(H₄). The major fatty acids (> 5.0%) were identified as anteiso-C_15:0, C_16:0, C_14:0 and anteiso-C_17:0. Meanwhile, DNA G+C content was 74.7%. The morphological and chemotaxonomic properties of strain NEAU-YY56^T were also confirmed the affiliation of the isolate to the genus Cellulomonas. However, physiological and biochemical characteristics indicated that strain NEAU-YY56^T can be clearly differentiated from its closest relatives. In addition, the ANI values and dDDH levels between strain NEAU-YY56^T and related Cellulomonas species were lower than the accepted threshold value. Therefore, it is concluded that strain NEAU-YY56^T represents a novel species of the genus Cellulomonas, for which the name Cellulomonas triticagri sp. nov. is proposed. The type strain is NEAU-YY56^T (= DSM 106717^T = JCM 32550^T).