Marivibrio halodurans gen. nov., sp nov., a marine bacterium in the family Rhodospirillaceae isolated from underground rock salt

Gram-negative, spiral or curved rod-shaped cells of a bacterial strain, designated ZC80(T), were isolated from a rock salt sample collected at Yunnan salt mine, China. Analysis of the strain's 16S rRNA gene sequence revealed a clear affiliation of this novel strain within the family Rhodospirillaceae. Strain ZC80(T) formed a robust cluster with Pelagibius litoralis CL-UU02(T) at a 16S rRNA gene sequence similarity level of 88.1 %. Strain ZC80(T) shared no more than 91.0% 16S rRNA gene sequence similarity with the type strains of other species in the family Rhodospirillaceae. Strain ZC80(T) was able to grow in the presence of 2-15% (w/v) NaCl, and grew at 10-50 degrees C and pH 6.0-10.0. The major fatty acids were C-19 : 0 cyclo omega 8c (41.3 %). The major isoprenoid quinone was ubiquinone 10 (Q-10). The major polar lipids were phosphatidylglycerol, phosphatidylethanolamine, diphosphatidylglycerol and an unidentified aminolipid. The DNA G+C content of strain ZC80(T) was 60.8 mol%. On the basis of phylogenetic analyses and chemotaxonomic and physiological data, strain ZC80(T) is considered to represent a novel species of a new genus in the family Rhodospirillaceae, for which the name Marivibrio halodurans gen. nov., sp. nov. is proposed. The type strain of Marivibrio halodurans is ZC80(T) (= CGMCC 1.15697(T) = NBRC 112461(T)).