Penicillium oxalicum augments soil lead immobilization by affecting indigenous microbial community structure and inorganic phosphate solubilization potential during microbial-induced phosphate precipitation. (15th February 2023)

• Record Type: Journal Article
• Authors: Tang, Fei; Li, Qiqiang; Yue, Jiaru; Ge, Fei; Li, Feng; Liu, Yun; Zhang, Dayi; Tian, Jiang
• Is Part Of: Environmental pollution. Volume 319(2023)
• Publication Date: 2023-02-15
• Subjects: Phosphate-solubilizing microorganism -- Lead immobilization -- Microbial-induced phosphate precipitation -- Phosphate cycling gene; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2022.120953
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Phosphate-solubilizing microorganisms (PSMs) are critically important for increasing soil phosphate (P) and decreasing lead (Pb) bioavailability during microbial-induced phosphate precipitation (MIPP). However, their relative contributions to the indigenous soil microbial communities and P-cycling genes during the MIPP process remain unclear. In this study, inoculation of the PSM P. oxalicum in hydroxyapatite-cultured and Pb-contaminated soil increased soil phosphatase activities, available P (AP) concentrations and reduced available Pb levels. Metagenomics revealed a 3.9–44.0% increase in the abundance of P-cycling genes by P. oxalicum inoculation. No P-cycling genes were assigned to Penicillium . While P. oxalicum increased the complexity of microbial community co-occurrence networks, and improved the directly interrelationships between Penicillium and genera containing P-cycling gene. These results suggesting that P. oxalicum obviously positively affected the regulation of indigenous P-cycling functional communities during the MIPP process. Inorganic P solubilization genes ( gcd, ppa, and ppx ) have been shown to affect soil AP, suggesting that inorganic P solubilization is the major driver of Pb immobilization improvement following P. oxalicum inoculation. These results enhance our understanding of the significant ecological role of PSMs in governing soil P-cycling and alleviating Pb 2+ biotoxicity during the MIPP process. Graphical abstract: Image 1 Highlights: P. oxalicum inoculation enhanced Pb 2+ stabilization by stimulating soil P availability. The relative abundance of P-cycling genes increased by 3.9–44.0% after inoculation. P. oxalicum stimulates the interrelationships between Penicillium and soil microbes. Increased inorganic P solubilization potential dominate MIPP enhancement.