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Soil salinization is an ecological environment issue globally and is one of the major abiotic stress factors that cause crop loss worldwide as well as hindering crop productivity. Halotolerant plant growth-promoting rhizobacteria (PGPR) having potential to promote crop growth and increase salt tolerance in crops can be employed to counter this issue in a more effective and eco-friendly way. The recent study aimed to assess the salinity tolerance and growth-promoting capacity of Bacillus tequilenis Bt-RS isolated from the rhizosphere soil of islands in the South China Sea, for assessment, the corresponding media were used for qualitative and quantitative analysis. A pot trail was also conducted to further evaluated its bacterial consortium to promote banana seedlings growth under salinity stress. The results showed that strain Bt-RS could grow well under the condition of 0-10% NaCl content with various types of salts. The strain Bt-RS also possessed 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity along with indole acetic acid (IAA, up to 6.4 mg/L under the condition of 1%-5% NaCl). Base on the pot experiment, the banana seedlings that were inoculated with Bt-RS displayed a significant increase in height, leaf area, fresh weight of above ground and underground, as well as dry weight of above ground and underground (40.30%, 93.00%, 102.38%, 81.08%, 65.82% and 50.50%, respectively) compared to the control group under normal conditions; The 200 mmol/L NaCl-stress treatment significantly increased the growth of banana seedlings in height, leaf area, fresh and dry weight of both above ground and underground by 20.55%, 65.01%, 98.14%, 144.93%, 87.85% and 54.01% respectively, when compared with the control group. The plant height, leaf area and biomass of banana seedlings were significantly increased in both normal conditions and salt stress environment (P<0.05). There was no difference in plant height and leaf area between the experimental group under salt stress environment and the control group under normal conditions, indicating that applying Bt-RS can alleviated the adverse effects of NaCl stress and enhanced banana seedlings growth attributes. In conclusion, the strain B. tequilensis Bt-RS exhibits high salt tolerance and possess the ability to produce IAA and ACC deaminase, making it a valuable strain for improving banana seedling growth and salt tolerance, and also providing resources of strain for developing and utilizing in saline soil.
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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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