Halomonas humidisoli Sp. Nov., Isolated From Saline-Alkaline Soil

Area of Science:

• Microbiology
• Bacteriology
• Environmental Science

Background:

• Halophilic bacteria play crucial roles in saline ecosystems.
• The genus Halomonas comprises diverse species adapted to various saline environments.
• Characterization of novel Halomonas species enhances understanding of microbial adaptation and biodiversity.

Purpose of the Study:

• To isolate and characterize a novel bacterial strain from saline-alkali wetland soil.
• To determine the phylogenetic and taxonomic position of the novel isolate.
• To propose a new species within the genus Halomonas.

Main Methods:

• Isolation and cultivation of bacteria from saline-alkali wetland soil.
• Phenotypic characterization including morphology, growth conditions, and biochemical tests.
• Phylogenetic analysis based on 16S rRNA gene sequencing.
• Genomic analysis including DNA G+C content, ANI, and dDDH values.
• Chemotaxonomic analysis of respiratory quinones, fatty acids, and polar lipids.

Main Results:

• A Gram-negative, aerobic, non-motile, halophilic bacterium, strain WN018T, was isolated.
• Phylogenetic analysis indicated affiliation with the genus Halomonas, with 97.50% 16S rRNA gene sequence similarity to Halomonas venusta.
• Genomic analysis revealed ANI of 93.02% and dDDH of 49.7% with Halomonas hydrothermalis.
• Strain WN018T exhibited optimal growth at 30-33°C, pH 7.5-8.0, and 4-8% NaCl.

Conclusions:

• Strain WN018T represents a novel species within the genus Halomonas.
• The proposed name for the novel species is Halomonas humidisoli sp. nov.
• This discovery contributes to the understanding of microbial diversity in extreme environments.