Martelella alba sp. nov., isolated from mangrove rhizosphere soil within the Beibu Gulf

Strain BGMRC 2036 T was isolated from rhizosphere soil of Bruguiear gymnorrhiza collected from the Beibu Gulf of China. Optimum growth occurred at 28 °C, pH 7.0, and under the conditions of 3–5% (w/v) NaCl. The phylogenetic comparisons of 16S rRNA gene sequences displayed that strain BGMRC 2036 T was closely related to Martelella limonii NBRC109441 T (96.6% sequence similarity), M. mediterranea CGMCC 1.12224 T (96.5%), M. lutilitoris GH2-6 T (96.5%), M. radicis BM5-7 T (96.2%), and M. mangrove BM9-1 T (95.9%), M. suaedae NBRC109440 T (95.8%). The phylogenomic tree based on the up-to-date bacterial core gene set indicated that the strain BGMRC 2036 T form a clade formed with members of the genera Martelella . The major polar lipids include phosphatidylmethylethanolamine, phosphatidylglycerol, phosphatidylcholine, phosphotidylinositol, two unidentified phospholipids, and three unidentified ninhydrin positive phospholipids. The major respiratory quinone is Q-10, which is similar to those of genera Martelella . The main cellular fatty acids are C 18:1 ω 7 c , C 16:0 , and C 12:0 aldehyde. Genome sequencing revealed a genome size of 4.99 Mbp and a G + C content of 62.3 mol%. Pairwise comparison of the genomes of the new strain BGMRC 2036 T and the three reference strains M. endophytica YC 6887 T , M. mediterranea CGMCC 1.12224 T , and M. mangrovi USBA-857 indicated that gANI value was lower than 81% and a digital DNA–DNA hybridization value was lower than 27%. The strain BGMRC 2036 T possessed genes putatively encoding riboflavin synthesis and flavodoxin A polyphasic taxonomic study suggested that strain BGMRC 2036 T represented a novel species belonging to the genus Martelella , and it was named Martelella alba sp. nov. The type strain is BGMRC 2036 T (=KCTC 52121 T =NBRC 111908 T ).