Effect of Phosphate-Solubilizing Bacteria on the Mobility of Insoluble Cadmium and Metabolic Analysis

Ping Yang, Xue-Fang Zhou, Li-Li Wang, Qu-Sheng Li, Ting Zhou, Yu-Kun Chen, Zi-Yi Zhao and Bao-Yan He
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Ping Yang: School of Environment, Jinan University, Guangzhou 511443, China
Xue-Fang Zhou: School of Environment, Jinan University, Guangzhou 511443, China
Li-Li Wang: School of Environment, Jinan University, Guangzhou 511443, China
Qu-Sheng Li: School of Environment, Jinan University, Guangzhou 511443, China
Ting Zhou: School of Environment, Jinan University, Guangzhou 511443, China
Yu-Kun Chen: School of Environment, Jinan University, Guangzhou 511443, China
Zi-Yi Zhao: School of Environment, Jinan University, Guangzhou 511443, China
Bao-Yan He: School of Environment, Jinan University, Guangzhou 511443, China

IJERPH, 2018, vol. 15, issue 7, 1-12

Abstract: Phosphate-solubilizing bacteria (PSB) can promote plant growth by dissolving insoluble phosphate. Therefore, PSB may have the potential to improve the mobility of heavy metals in soils and enhance phytoextraction. This study isolated a few PSB strains that could dissolve CdCO 3 and solid Cd in soil. Two typical PSB, namely, high- and low-Cd-mobilizing PSB ( Pseudomonas fluorescens gim-3 and Bacillus cereus qh-35, respectively), were selected to analyze the metabolic profiles, metabolic pathways, and mechanisms of mobilization of insoluble Cd. A total of 34 metabolites secreted by the two PSB strains were identified. Gluconic acid was the main contributor to Cd dissolution (42.4%) in high-Cd-mobilizing PSB. By contrast, gluconic acid was not secreted in low-Cd-mobilizing PSB. Metabolic pathway analysis showed that gluconic acid was produced by the peripheral direct oxidation pathway. Hence, PSB with peripheral direct oxidation pathway were likely to have high-Cd-mobilizing capacity.

Keywords: phosphate-solubilizing bacteria; cadmium-mobilizing bacteria; metabolic pathway; organic acid (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
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