Hymenobacter Biocrusticola sp. nov., Isolated from Desert Biocrust.

Area of Science:

• Microbiology
• Bacteriology
• Environmental Science

Background:

• Biological soil crusts are vital ecosystems in arid environments.
• Understanding microbial diversity in deserts is crucial for ecological studies.

Purpose of the Study:

• To isolate and characterize a novel bacterial species from a desert biological soil crust.
• To determine the phylogenetic and chemotaxonomic properties of the novel bacterium.

Main Methods:

• Isolation and cultivation of strain B81^T from a sandy desert soil crust.
• 16S rRNA gene sequencing for phylogenetic analysis.
• Analysis of cellular fatty acids, respiratory quinones, and polar lipids.
• Genome sequencing to determine genome size and DNA G+C content.
• Average Nucleotide Identity (ANI) and digital DNA-DNA hybridization (dDDH) for species delineation.

Main Results:

• Strain B81^T is a pink, aerobic, Gram-negative bacterium.
• Optimal growth at pH 7.0, 30°C, and 1.5% NaCl.
• Phylogenetic analysis showed close relation to Hymenobacter busanensis and Hymenobacter coalescens (97% 16S rRNA similarity).
• Chemotaxonomic data (menaquinone-7, major fatty acids, polar lipids) consistent with the genus Hymenobacter.
• ANI (81.8%) and dDDH (24.8%) values with H. busanensis MA3^T confirmed it as a distinct species.
• Genome size of 5.01 Mb and DNA G+C content of 64.90%.

Conclusions:

• Strain B81^T represents a novel species within the genus Hymenobacter.
• The proposed name for the novel species is Hymenobacter biocrusticola sp. nov.
• This discovery contributes to the understanding of microbial diversity in extreme desert environments.