Abstract
Microbe-assisted phytoremediation provides an eco-friendly and cost-effective approach to reclaim Cd- and Pb-contaminated soils. In this work, incubation and pot experiments were established to investigate the effect of Streptomyces pactum (Act12) combined with compost on soil physicochemical properties, enzymatic activities, and thereby acted on phytoextraction of Cd and Pb by using potherb mustard (Brassica juncea Coss.). The addition of Act12 and compost increased EC (7.2%), available phosphorus (P) (14.9%), available potassium (K) (17.0 folds), DOC (37.7%), OM (2.8 folds), urease (49.8%), dehydrogenase (2.2 folds), and alkaline phosphatase (23.0 folds) of soil, while reduced pH (7.7%) compared with control. Significant decrease of available Cd and Pb uptake was observed after adding compost and Act12 by 29.1% and 32.2%. Presence of compost and Act12 enhanced the biomass by 3.98 folds and 1.83 folds in shoots and roots of plant. Results showed the assimilation of Cd and Pb in shoots was increased by 103.8% and 48.7% due to the increased of biomass. Meanwhile, the rhizosphere effect of soil microorganisms increased the uptake of Cd (60.4%) and Pb (19.2%) in roots. These findings suggested that Act12 joined with compost-strengthened potherb mustard phytoremediation of Cd- and Pb-polluted soils, which may provide new insights into the clean-up of mining-contaminated soils in field practice.
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Our special gratitude also goes to the anonymous constructive suggestions on this work.
Funding
This work was supported in part by the Science and Technology Program of Yangling Demonstration Zone (China) (2017NY-24) and the R&D Project of Shaanxi Province (2018ZDCXL-NY-02-02).
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Highlights
• Soil fertility and enzymatic activities were improved by compost treatment.
• Compost + Act12 improved the soil quality and PTEs solubility.
• Compost + Act12 facilitated PTEs uptake in Brassica juncea.
• Microbial-assisted phytoremediation is a potential strategy for soil PTEs reclaim.
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Liu, X., Guo, D., Ren, C. et al. Performance of Streptomyces pactum–assisted phytoextraction of Cd and Pb: in view of soil properties, element bioavailability, and phytoextraction indices. Environ Sci Pollut Res 27, 43514–43525 (2020). https://doi.org/10.1007/s11356-020-09842-6
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DOI: https://doi.org/10.1007/s11356-020-09842-6