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Phosphate-solubilizing and -mineralizing abilities of bacteria isolated from soils.

作者：

Tao GuangCan;Tian ShuJun;Cai MiaoYing;Xie GuangHui

单位：

;Laboratory of Energy Crops, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China.

关键词：

bioavailability;microorganisms;mineralization;phosphorus;soil;solubilization;strains;subtropics;bacillus;bacillus cereus;bacillus megaterium;bacteria;cereus;pseudomonas;pseudomonas cichorii;pseudomonas syringae

摘要：

Microorganisms capable of solubilizing and mineralizing phosphorus (P) pools in soils are considered vital in promoting P bioavailability. The study was conducted to screen and isolate inorganic P-solubilizing bacteria (IPSB) and organic P-mineralizing bacteria (OPMB) in soils taken from subtropical flooded and temperate non-flooded soils, and to compare inorganic P-solubilizing and organic P-solubilizing abilities between IPSB and OPMB. Ten OPMB strains were isolated and identified as Bacillus cereus and Bacillus megaterium, and five IPSB strains as B. megaterium, Burkholderia caryophylli, Pseudomonas cichorii, and Pseudomonas syringae. P-solubilizing and -mineralizing abilities of the strains were measured using the methods taking cellular P into account. The IPSB strains exhibited inorganic P-solubilizing abilities ranging between 25.4-41.7 .g P mL-1 and organic P-mineralizing abilities between 8.2-17.8 .g P mL-1. Each of the OPMB strains also exhibited both solubilizing and mineralizing abilities varying from 4.4 to 26.5 .g P mL-1 and from 13.8 to 62.8 .g P mL-1, respectively. For both IPSB and OPMB strains, most of the P mineralized from the organic P source was incorporated into the bacterial cells as cellular P. A significantly negative linear correlation (P<0.05) was found between culture pH and P solubilized from inorganic P by OPMB strains. The results suggested that P solubilization and mineralization could coexist in the same bacterial strain.

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Phosphate-solubilizing and -mineralizing abilities of bacteria isolated from soils.

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