Biotechnology Bulletin ›› 2018, Vol. 34 ›› Issue (6): 183-189.doi: 10.13560/j.cnki.biotech.bull.1985.2017-1122

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Isolation,Identification of Phosphate-solubilizing Bacteria Derived from Phosphate Tailing Soil and Their Capacities

CHEN Jia-xing1,2 ,QIN Qin1,2 ,QIU Shu-yi1,2 ,WANG Xue-li1,2,3   

  1. 1. Guizhou Provincial Key Laboratory of Fermentation Engineering and Biological Pharmacy,Guizhou University,Guiyang 550025;
    2. School of Liquor and Food Engineering,Guizhou University,Guiyang 550025;
    3. College of Life Sciences,Guizhou University,Guiyang 550025
  • Received:2017-12-26 Online:2018-06-26 Published:2018-07-03

Abstract: High phosphate-solubilizing bacteria(PSBs)were isolated from phosphate tailings soil in Wengfu Group,Guizhou Province. PSBs were screened by dissolving phosphate ring test. And the genera of the phosphate-solubilizing bacteria were primarily determined by a combination of morphological characteristics identification,physiological and biochemical test,16S rDNA gene sequences analysis,and phylogenic trees. The maximum phosphate-solubilizing activity of these strains were determined by using Mo-Sb colorimetry with tricalcium phosphate as the only phosphate source,and the relationships between the abilities of different PSBs and the pH value of the culture medium were explored. The PSB1,PSB3 and PSB4 of 4 PSBs isolated from phosphate tailings soil presented obvious phosphate-solubilizing rings. The PSB1,PSB3,and PSB4 were identified to be Serratia plymuthica,Stenotrophomonas maltophilia,and Brevundimonas vesicularis,respectively. The maximum phosphate-solubilizing activities of these strains were 148.87 μg/mL,153.84 μg/mL,and 146.76 μg/mL,respectively. Compared with information in the published articles in China,the three strains all had high phosphate-solubilizing ability. For the PSB1 and PSB4,there were a significantly negative correlation between the phosphate-solubilizing ability and the pH of the culture medium,but not so for the PSB3,and the phosphate-solubilizing mechanism of the PSB3 should be further investigated.

Key words: phosphate tailings soil, phosphate-solubilizing bacteria, phosphate-solubilizing ability, identification