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Pseudoalteromonas rhizosphaerae sp. nov., a novel plant growth-promoting bacterium with potential use in phytoremediation

Lookup NU author(s): Emeritus Professor Hans-Peter Klenk, Dr Maria Del Carmen Montero-CalasanzORCiD

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Abstract

Strain RA15T was isolated from the rhizosphere of the halophyte plant Arthrocnemum macrostachyum growing in the Odiel marshes (Huelva, Spain). RA15T cells were Gram stain-negative, non-spore-forming, aerobic rods and formed cream-coloured, opaque, mucoid, viscous, convex, irregular colonies with an undulate margin. Optimal growth conditions were observed on tryptic soy agar (TSA) plates supplemented with 2.5 % NaCl (w/v) at pH 7.0 and 28 °C, although it was able to grow at 4-32 °C and at pH values of 5.0-9.0. The NaCl tolerance range was from 0 to 15 %. The major respiratory quinone was Q8 but Q9 was also present. The most abundant fatty acids were summed feature 3 (C16 : 1 ω7c and/or C16 : 1 ω6c), C17 : 1 ω8c and C16 : 0. The polar lipids profile comprised phosphatidylglycerol and phosphatidylethanolamine as the most abundant representatives. Phylogenetic analyses confirmed the well-supported affiliation of strain RA15T within the genus Pseudoalteromonas, close to the type strains of Pseudoalteromonas neustonica, Pseudoalteromonas prydzensis and Pseudoalteromonas mariniglutinosa. Results of comparative phylogenetic and phenotypic studies between strain RA15T and its closest related species suggest that RA15T could be a new representative of the genus Pseudoalteromonas, for which the name Pseudoalteromonas rhizosphaerae sp. nov. is proposed. The type strain is RA15T (=CECT 9079T=LMG 29860T). The whole genome has 5.3 Mb and the G+C content is 40.4 mol%.

Publication metadata

Author(s): Navarro-Torre S, Carro L, Rodriguez-Llorente ID, Pajuelo E, Caviedes MA, Igual JM, Klenk H-P, Montero-Calasanz MDC

Publication type: Article

Publication status: Published

Journal: International Journal of Systematic and Evolutionary Microbiology

Year: 2020

Volume: 70

Issue: 5

Pages: 3287-3294

Online publication date: 28/04/2020

Acceptance date: 02/04/2016

Date deposited: 08/06/2020

ISSN (print): 1466-5026

ISSN (electronic): 1466-5034

Publisher: Microbiology Society

URL: https://doi.org/10.1099/ijsem.0.004167

DOI: 10.1099/ijsem.0.004167

PubMed id: 32375987

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