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Water 2018, 10(2), 195;

Phosphorus Solubilizing and Releasing Bacteria Screening from the Rhizosphere in a Natural Wetland

Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 210096, China
Department of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China
Author to whom correspondence should be addressed.
Received: 24 December 2017 / Revised: 29 January 2018 / Accepted: 30 January 2018 / Published: 12 February 2018
(This article belongs to the Special Issue Sponge Cities: Emerging Approaches, Challenges and Opportunities)
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Inorganic phosphorus (P)-solubilizing bacteria (IPSB) and organic P-mineralizing bacteria (OPMB) were isolated from bacteria that were first extracted from the rhizosphere soil of a natural wetland and then grown on either tricalcium phosphate or lecithin medium. The solubilizing of inorganic P was the major contribution to P availability, since the isolated bacteria released much more available P from inorganic tricalcium phosphate than lecithin. IPSB No. 5 had the highest P release rate, that is, 0.53 mg·L−1·h−1 in 96 h, and R10′s release rate was 0.52 mg·L−1·h−1 in 10 days. The bacteria were identified as Pseudomonas sp. and Pseudomonas knackmussii, respectively. R10 released as much as 125.88 mg·L−1 dissolved P from tricalcium phosphate medium, while R4 released the most dissolved P from organic P medium among the isolates, with a concentration of 1.88 mg·L−1 and a releasing rate of 0.0078 mg·L−1·h−1 in ten days. P releasing increased with a pH decrease only when it was from inorganic P, not organic lecithin, and there was no significant correlation between the culture pH and P solubilizing. High-throughput sequencing analysis revealed that the dominant phylum in the studied wetland rhizosphere consisted of Acidobacteria, Proteobacteria, Bacteroidetes and Chloroflexi, accounting for 34.9%, 34.2%, 8.8% and 4.8%, respectively. View Full-Text
Keywords: wetland; rhizosphere bacteria; available phosphorus; pH wetland; rhizosphere bacteria; available phosphorus; pH

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Cao, Y.; Fu, D.; Liu, T.; Guo, G.; Hu, Z. Phosphorus Solubilizing and Releasing Bacteria Screening from the Rhizosphere in a Natural Wetland. Water 2018, 10, 195.

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