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Halomonas avicenniae sp. nov., isolated from the salty leaves of the black mangrove Avicennia germinans in Puerto Rico

¹ Biology Department Box 9012, University of Puerto Rico, Mayagüez 00681, Puerto Rico
² Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain

Correspondence
Rafael Montalvo-Rodríguez
titomontal{at}yahoo.com

A Gram-negative, short rod to oval-shaped bacterium (strain MW2a^T) was isolated from the surface of leaves of the black mangrove Avicennia germinans and subjected to a polyphasic taxonomic study. Strain MW2a^T was moderately halophilic, growing at NaCl concentrations in the range 0–25 % (w/v) with optimum growth at 5 % (w/v) NaCl. Growth occurred at 12–40 °C (optimum, 30–35 °C) and at pH 5.0–9.0 (optimum, pH 7.0–8.0). Strain MW2a^T was strictly aerobic. Phylogenetic analysis based on the 16S rRNA gene showed that the strain belongs to the genus Halomonas. The closest relative was Halomonas marisflavi, with 98.6 % 16S rRNA gene sequence similarity. The DNA G+C content of strain MW2a^T was 61.5 mol%, which is in the range of values for Halomonas species. DNA–DNA hybridization with H. marisflavi showed a relatedness of 42 % and lower values were obtained with respect to other related Halomonas species. The major fatty acids were C_{16 : 0}, C_{19 : 0} cyclo 8c, C_{18 : 1}7c and C_{12 : 0} 3-OH. Overall, the phenotypic, genotypic and phylogenetic results presented in this study demonstrate that strain MW2a^T represents a novel species within the genus Halomonas. The name Halomonas avicenniae sp. nov. is proposed, with strain MW2a^T (=CECT 7193^T=CCM 7396^T) as the type strain.

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