关键词: 解磷菌, 雪茄根际土壤, 阿氏普里斯特氏菌（Priestia aryabhattai）, SCUEC21菌株, 促生特性

Abstract: A phosphorus-solubilizing bacterial strain, designated SCUEC21, was isolated from cigar rhizosphere soil using the phosphorus dissolution zone primary screening and shake flask secondary screening. The strain was identified as Priestia aryabhattai based on colony morphology, physiological-biochemical characteristics, and 16S rDNA gene sequence analysis. Furthermore, their characteristics such as phosphorus-solubilizing, potassium-solubilizing, nitrogen-fixing, indole-3-acetic acid (IAA)-producing, salt-tolerant, acid-alkali-tolerant, and drought-tolerant abilities were determined. The experimental results showed that the inorganic phosphorus-solubilizing amount of Priestia aryabhattai SCUEC21 was 47.79 μg/mL, the organic phosphorus-solubilizing amount was 16.20 μg/mL, and the potassium-solubilizing amount was 27.45 μg/mL. Meanwhile, it had the abilities of nitrogen fixation and IAA production, and exhibited certain tolerance to salt, alkali, and drought. Priestia aryabhattai SCUEC21 could effectively increase the content of phosphorus in the soil, which was beneficial to the absorption and utilization of phosphorus by cigars plants, thus providing an excellent germplasm resource for addressing the issue of insufficient phosphorus utilization by plants from soil.

Key words: phosphate-solubilizing bacteria, cigar rhizosphere soil, Priestia aryabhattai, SCUEC21 strain, growth promotion characteristics