Luteimonas cucumeris sp. nov., isolated a from cucumber leaf.

Area of Science:

• Microbiology
• Bacteriology
• Plant-associated microbes

Background:

• The genus Luteimonas comprises Gram-negative bacteria, often isolated from aquatic environments.
• Understanding bacterial diversity in agricultural settings is crucial for plant health and disease management.

Purpose of the Study:

• To characterize a novel bacterial isolate from a cucumber leaf.
• To determine the taxonomic placement of the novel isolate within the Luteimonas genus.

Main Methods:

• Isolation and cultivation of bacteria from cucumber leaves.
• Phylogenetic analysis using 16S rRNA gene sequencing.
• DNA-DNA hybridization for genetic relatedness assessment.
• Fatty acid analysis and determination of DNA G+C content.

Main Results:

• A Gram-negative, aerobic, non-motile rod, designated Y4(T), was isolated.
• Phylogenetic analysis showed Y4(T) is most closely related to Luteimonas aquatica (96.7% 16S rRNA similarity).
• Low DNA-DNA relatedness (42.5 ± 3.9%) and distinct chemotaxonomic features (fatty acids, Q-8, 69.9 mol% G+C) confirmed Y4(T) as a new species.

Conclusions:

• Strain Y4(T) represents a novel species of the genus Luteimonas.
• The proposed name for this new species is Luteimonas cucumeris sp. nov.
• The type strain is Y4(T) (CGMCC 1.10821(T) = KCTC 23627(T)).