PDF
Full
Outline
Objective To isolate multifunctional phosphate-solubilizing bacteria (PSB) exhibiting psychrophilic adaptation and saline-alkaline tolerance in response to the ecological challenge of phosphorus limitation in saline-alkaline soils in cold regions, evaluate their phosphate-solubilizing efficiency and environmental adaptability, and preliminarily investigate their phosphate-solubilizing mechanisms. Methods We used an inorganic phosphorus-selective medium to isolate bacterial strains from saline-alkaline soils in Baicheng, Jilin Province. The phosphate-solubilizing capacity was quantitatively determined through the molybdenum-antimony colorimetric method. Taxonomic identification was performed through morphological characterization and phylogenetic analysis based on 16S rRNA gene sequences. The phosphate solubilization conditions were optimized via multi-parameter gradient optimization. HPLC was employed to quantify organic acid metabolites. Phenol-sulfuric acid assay and crystal violet staining were employed to characterize biofilm formation and extracellular polysaccharide (EPS) synthesis. Results The isolated strain Pseudomonas psychrophila MPP2402 demonstrated broad-spectrum environmental adaptability, maintaining stable growth at 5-30 ℃, pH 7.0-10.0, and 0.2-0.8 mol/L NaCl. The strain achieved 574.66 mg/L soluble phosphorus (14.8% increase) under optimal conditions: 15 ℃, pH 7.0, 0.4 mol/L NaCl, 1% inoculum density, and 5 g/L Ca3(PO4)2. MPP2402 may exert the phosphate-solubilizing effect through the secretion of organic acids such as succinic acid (51.53 μg/mL), oxalic acid (22.84 μg/mL), tartaric acid (15.11 μg/mL), and malic acid (5.93 μg/mL), which worked in concert to solubilize phosphate. Additionally, the strain utilized EPS to construct a biofilm barrier and regulated the viable count in adverse environments such as low-temperature and saline-alkaline conditions. Conclusion The successful isolation of MPP2402 establishes a foundational resource for developing efficient saline-alkaline tolerant microbial agents and improving soil nutrient management in cold-region ecosystems.
PDF
263
106
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
