[Isolation, identification and characterization of five Pseudomonas strains]

Area of Science:

• Microbiology
• Biotechnology
• Pharmacology

Background:

• Soil harbors diverse microbial communities with potential applications.
• Pseudomonas species are known for their beneficial properties.
• Exploring novel strains for therapeutic potential is crucial.

Purpose of the Study:

• To isolate and identify Pseudomonas strains from soil samples in Changsha, Hunan province.
• To evaluate the antimicrobial and antitumor activities of the isolated strains.
• To characterize strains with significant biological activities.

Main Methods:

• Isolation of Pseudomonas strains using the Galleria bait method.
• Identification via morphological, physiological, biochemical, and 16S rRNA sequencing.
• Antimicrobial, antifungal, and antitumor assays (diffusion, dual-culture, cytotoxicity tests).

Main Results:

• Five Pseudomonas strains were isolated and identified: *P. protegens* CY01, *P. chlororaphis* CY02, *P. oryzihabitans* CY04, *P. sp.* CY05, and *P. putida* CY06.
• *P. protegens* CY01 and *P. chlororaphis* CY02 exhibited antibacterial activity against *Bacillus subtilis* and *Staphylococcus aureus*.
• *P. chlororaphis* CY02 demonstrated antifungal activity against *Pyricularia oryzae* and antitumor activity against B16 melanoma cells.

Conclusions:

• *Pseudomonas chlororaphis* CY02 possesses significant antimicrobial and antitumor properties.
• This strain shows potential for development as a therapeutic agent.
• Further research into its mechanisms of action is warranted.