Filimonas zeae sp. nov., an endophytic bacterium isolated from maize root.

A novel Gram-stain-negative, aerobic, motile by gliding and filamentous strain, designated 772T,was isolated from surface-sterilized root tissue of maize planted in the Fangshan District of Beijing, China. 16S rRNA gene sequence analysis indicated that strain 772T was closely related to Filimonas endophytica SR2-06T andFilimonas lacunae YT21T of the family Chitinophagaceae with sequence similarities of 99.0 and 96.9 %, respectively. However, the new isolate exhibited relatively low levels of DNA-DNA relatedness with respect to Filimonas. endophytica KCTC 42060T (18.7±1.8 %) and Filimonas. lacunae DSM 21054T (17.9±2.0%). The DNA G+C content of strain 772T was 44.9 mol%. The respiratory quinone was menaquinone-7 and the polar lipid profile consisted of phosphatidylethanolamine, two unidentified aminophospholipids, two unidentified phospholipids and one unidentified lipid. The major fatty acids were iso-C15 : 0 and iso-C15 : 1 G. The results of the physiological and biochemical tests and minor differences in the fatty acid profiles allowed the clear phenotypic differentiation of strain 772T from the closely related species Filimonas. endophytica andF. lacunae. Strain 772T thus represents a novel species within the genus Filimonas, for which the name Filimonas zeae sp. nov. is proposed. The type strain is 772T (=CGMCC 1.15290T=DSM 100760T).