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Alexandriicola marinus gen. nov., sp. nov., a new member of the family Rhodobacteraceae isolated from marine phycosphere |
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| Authors: | Zhu Wen-Zhuo Gao Hui-Min Ge Ya-Ming Dai Jun Yang Xi Zhang Xiao-Ling Yang Qiao |
| Institution: | 1.Department of Marine Chemistry, College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan, China ;2.National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan, China ;3.Key Laboratory of Fermentation Engineering, Natural “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei Provincial Cooperative Innovation Center of Industrial Fermentation, College of Bioengineering, Hubei University of Technology, Ministry of Education, Wuhan, China ;4.Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou, China ;5.ABI Group, Zhejiang Ocean University, Zhoushan, China ; |
| Abstract: | Two yellow-pigmented bacterial strains, LZ-14 T and ABI-LZ29, were isolated from the cultivable phycosphere microbiota of the highly toxic marine dinoflagellate Alexandrium catenella LZT09 and demonstrated obvious microalgae growth-promoting potentials toward the algal host. To elucidate the taxonomic status of the two bioactive bacterial strains, they were subjected to a polyphasic taxonomic characterization. Both strains were found to be Gram-negative, aerobic, rod-shaped and motile; to contain Q-10 as the predominant ubiquinone; summed feature 8, C16:0, C18:1 ω7c 11-methyl and summed feature 3 as the major fatty acids; and diphosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol and two unidentified phospholipids as the predominant polar lipids. Based on the phylogenetic analysis, phylogenomic inferences and phenotypic characteristics, the strains could be clearly distinguished from phylogenetically closely related species and formed a distinct monophyletic lineage in the family Rhodobacteraceae. The size of the draft genome of strain LZ-14 T is 4.615 Mb, with a DNA G?+?C content of 63.3 mol%. It contains ten predicted secondary metabolite biosynthetic gene clusters and core genes for bacterial exopolysaccharide biosynthesis. Therefore, strain LZ-14 T (= CCTCC AB 2017230 T?=?KCTC 62342 T) represents a novel species of a new genus, for which the name Alexandriicola marinus gen. nov., sp. nov., is proposed. |
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