Kaustia mangrovi gen. nov., sp. nov. isolated from Red Sea mangrove sediments belongs to the recently proposed Parvibaculaceae family within the order Rhizobiales

Fatmah O. Sefrji, Ramona Marasco, Gregoire Michoud, Kholoud A. Seferji, Giuseppe Merlino, Daniele Daffonchio

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We isolated a novel strain, R1DC25T, described as Kaustia mangrovi gen. nov. sp. nov. from the sediments of a mangrove forest on the coast of the Red Sea in Saudi Arabia. This isolate is a moderately halophilic, aerobic/facultatively anaerobic Gram-stain-negative bacterium showing optimum growth at between 30 and 40 °C, at a pH of 8.5 and with 3–5 % NaCl. The genome of R1DC25T comprises a circular chromosome that is 4 630 536 bp in length, with a DNA G+C content of 67.3 mol%. Phylogenetic analyses based on the 16S rRNA gene sequence and whole-genome multilocus sequence analysis of 120 concatenated single-copy genes revealed that R1DC25T represents a distinct lineage within the family Parvibaculaceae in the order Rhizobiales within the class Alphaproteobacteria. R1DC25T showing 95.8, 95.3 and 94.5 % 16S rRNA gene sequence identity with Rhodoligotrophos appendicifer, Rhodoligotrophos jinshengii and Rhodoligotrophos defluvii, respectively. The predominant quinone was Q-10, and the polar lipids were phosphatidylglycerol, phosphatidylcholine, diphosphatidylglycerol, as well as several distinct aminolipids and lipids. The predominant cellular fatty acids were C19 : 0 cyclo ω8c, a combination of C18 : 1ω7c and/or C18 : 1ω6c and C16 : 0. On the basis of the differences in the phenotypic, physiological and biochemical characteristics from its known relatives and the results of our phylogenetic analyses, R1DC25T (=KCTC 72348T;=JCM 33619T;=NCCB 100699T) is proposed to represent a novel species in a novel genus, and we propose the name Kaustia mangrovi gen. nov., sp. nov. (Kaustia, subjective name derived from the abbreviation KAUST for King Abdullah University of Science and Technology; mangrovi, of a mangrove).
Original languageEnglish (US)
JournalInternational Journal of Systematic and Evolutionary Microbiology
Issue number5
StatePublished - May 17 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-06-08
Acknowledged KAUST grant number(s): REI/1/4483-01-01, CRG-7–3739
Acknowledgements: This research was funded by King Abdullah University of Science and Technology (KAUST) as part of the Circular Carbon Economy initiative (grant number, REI/1/4483-01-01) and the Competitive Research Grant ‘Microlanding, The role of the bacterial symbiome at the gill-water (air) interface in the evolution toward terrestrialization’ (grant number, CRG-7–3739)”.

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Microbiology


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