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The characteristics of the novel bacterial strain Pseudomonas mendocina isolatedfrom freshwater aquaculture farm
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Researchers characterised a novel Pseudomonas mendocina bacterial strain isolated from a freshwater aquaculture farm, examining its plastic-biodegrading properties and evaluating its potential to address plastic contamination affecting water quality and fish product safety.
Plastic contamination can cause damage to the water quality of fish farm ponds, and also affect the quality of the final product. Pseudomonas mendocina was found to biodegrade plastics. Our study aimed to investigate the physicochemical properties and drug resistance of P. mendocina isolated from local freshwater aquaculture farms. Firstly, the strain was isolated from aquaculture water and then identified by matrix-assisted flight mass spectrometry and 16S rDNA sequencing. Then, biochemical and antibiotic resistance analyses were performed, and a microbial high-throughput growth detector was used to assess the growth of the strain. Finally, PCR and proteomics analyses were conducted to determine drug-resistance-related genes/proteins. According to the results of the spectrum diagram and sequencing, the isolated bacteria were identified as P. mendocina, and were positive for reactions of ADH, MTE, LAC, MNE, FRU, CIT, MLT, ONPG, and ACE. P. mendocina was sensitive to most of the antibiotics, and its resistance to CHL, MIN, and TIC/CLA was intermediate. Additionally, gyrB was the resistance gene, and mdtA2, mdtA3, mdaB, and emrK1 were closely related to the drug resistance of P. mendocina. Our results show the biochemical properties of P. mendocina in isolated aquaculture water, and provide a new perspective for P. mendocina involved in the biological removal of plastics or microplastics in freshwater aquaculture farms.
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