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Outline
A strain of polycyclic aromatic hydrocarbons (PAHs) degrading bacteria, QYQ-1, was isolated from the sediments of the Jialing River bed. Through 16S rRNA sequence alignment, calculation of average nucleotide identity, and whole-genome phylogenetic analysis, it was identified as Pseudomonas jessenii. The strain QYQ-1 exhibits a wide adaptive range for temperature (15~40℃) and pH (5~9), excellent salt tolerance (0.5%~5%), and good heavy metal resistance (Cu2+, Zn2+, Co2+, Mn2+, Cd2+). It has a unique advantage in withstanding low temperatures (15℃), high salinity (5%), and heavy metals. The optimal degradation conditions are at a temperature of 35℃ and a pH of 7, achieving a degradation rate of 97.7% for 100mg/L naphthalene within 48hours. Additionally, it can efficiently degrade aromatic compounds such as benzoic acid and phenol. Genomic analysis indicates that the strain QYQ-1 possesses various key genes involved in the degradation of multiple PAHs, including a complete pathway for benzoate degradation and a meta-cleavage pathway for catechol. It also contains critical genes related to PAHs degradation, such as salicylate hydroxylase, cytochrome P450, and protocatechuate 3,4-dioxygenase. Additionally, it carries a significant number of resistance genes for heavy metals such as copper, zinc, cobalt, manganese, and cadmium. Furthermore, strain QYQ-1 has a robust iron uptake system. This expands the application range of strain QYQ-1, making it suitable not only for environmental remediation of PAHs-contaminated sites but also for potential use in environments contaminated with both heavy metals and PAHs.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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