To screen salt-tolerant and growth-promoting bacterial strains adapted to the extreme environment of Southern Xinjiang from the rhizosphere soil of Cyperus esculentus L. and enrich the strain resource bank for saline-alkali sandy soils in Xinjiang， this study employed the targeted screening medium culture method， shake flask culture method， and 16S rDNA identification method to isolate salt-tolerant and growth-promoting strains， determine their growth-promoting characteristics， and finally further verify the growth-promoting effects of these strains through Cyperus esculentus seed germination tests and potted seedling experiments. A total of 10 salt-tolerant and growth-promoting strains were obtained， which belonged to the genera Bacillus， Vreelandella， Exiguobacterium， and Bisbaumannia， with their salt tolerance thresholds ranging from 4% to 8% NaCl. Among these strains， strain Y-38 （Exiguobacterium acetylicum） exhibited prominent inorganic phosphorus-solubilizing ability （0.65 mg·L^-1）， strain Y-35 （Exiguobacterium mexicanum） showed the highest production of indole-3-acetic acid （IAA） （64.35 mg·L^-1）， and strain Y-46 （Bisbaumannia pacifica） could tolerate 8% NaCl. In the seed germination experiment， the germination rate of the Y-38 treatment group reached 82.00%， which was significantly 26.89% higher than the control group （P<0.05）； in the potted experiment， growth indicators of the Y-38 treatment group， including plant height （39.17 cm）， leaf width （5.22 mm）， and stem diameter （5.52 mm）， were all significantly higher than those of the Y-46 and Y-35 treatment groups （P<0.05）. The comprehensive ranking of the growth-promoting effects of the three strains was Y-38>Y-46>Y-35. Ultimately， the high salt tolerance and growth-promoting function of strain Y-38 （Exiguobacterium acetylicum） was confirmed， providing a bacterial strain resources for the improvement of saline-alkali soils.

Cyperus esculentus L.  /  Rhizosphere growth-promoting bacteria  /  Salt-tolerant bacteria  /  Isolation and identification