Effects of Three Plant Growth-Promoting Bacterial Symbiosis with Ryegrass for Remediation of Cd, Pb, and Zn Soil in a Mining Area

47 Pages Posted: 8 Nov 2023

See all articles by Yan Zhao

Yan Zhao

affiliation not provided to SSRN

Jun Yao

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering

Hao Li

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering

Geoffrey Sunahara

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering

Miaomiao Li

affiliation not provided to SSRN

Chuiyun Tang

affiliation not provided to SSRN

Robert Duran

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering

Bo Ma

affiliation not provided to SSRN

Houquan Liu

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering

Junjie Zhu

affiliation not provided to SSRN

Lingyun Feng

affiliation not provided to SSRN

Yingjian Wu

affiliation not provided to SSRN

Abstract

The quality of soil containing heavy metals (HMs) around nonferrous metal mining areas is often not favorable for plant growth. Three types of plant growth promoting rhizobacteria (PGPR)-assisted ryegrass were examined here to treat Cd, Pb, and Zn contaminated soil collected from a nonferrous metal smelting facility. The effects of PGPR-assisted plants on soil quality, plant growth, and the migration and transformation of HMs were evaluated. Results showed that inter-root inoculation of PGPR to ryegrass increased soil redox potential, urease, sucrase and acid phosphatase activities, microbial calorimetry, and bioavailable P, Si, and K content. Inoculation with PGPR also increased aboveground parts and root length, P, Si, and K contents, and antioxidant enzyme activities. The most significant effect was that the simultaneous inoculation of all three PGPRs increased the ryegrass extraction (%) of Cd (59.04-79.02), Pb (105.56-157.13), and Zn (27.71-40.79), compared to CK control (without fungi). Correspondingly, the inter-root soil contents (%) of total Cd (39.94-57.52), Pb (37.59-42.17), and Zn (34.05-37.28) were decreased compared to the CK1 control (without fungi and plants), whereas their bioavailability was increased. Results suggest that PGPR can improve soil quality in mining areas, promote plant growth, transform the fraction of HMs in soil, and increase the extraction of Cd, Pb, and Zn by ryegrass. PGPR is a promising microbe-assisted phytoremediation strategy that can promote the re-greening of vegetation in the mining area while remediating HMs pollution.

Keywords: Plant growth-promoting bacteria, Heavy Metal Pollution, Soil quality, Plant extraction, Ryegrass

Suggested Citation

Zhao, Yan and Yao, Jun and Li, Hao and Sunahara, Geoffrey and Li, Miaomiao and Tang, Chuiyun and Duran, Robert and Ma, Bo and Liu, Houquan and Zhu, Junjie and Feng, Lingyun and Wu, Yingjian, Effects of Three Plant Growth-Promoting Bacterial Symbiosis with Ryegrass for Remediation of Cd, Pb, and Zn Soil in a Mining Area. Available at SSRN: https://ssrn.com/abstract=4626768 or http://dx.doi.org/10.2139/ssrn.4626768

Yan Zhao

affiliation not provided to SSRN ( email )

No Address Available

Jun Yao (Contact Author)

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering ( email )

29 Xueyuan Road
Beijing, 100083
China

Hao Li

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering ( email )

29 Xueyuan Road
Beijing, 100083
China

Geoffrey Sunahara

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering ( email )

Miaomiao Li

affiliation not provided to SSRN ( email )

No Address Available

Chuiyun Tang

affiliation not provided to SSRN ( email )

No Address Available

Robert Duran

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering ( email )

29 Xueyuan Road
Beijing, 100083
China

Bo Ma

affiliation not provided to SSRN ( email )

No Address Available

Houquan Liu

China University of Geosciences (CUG) - School of Water Resources and Environment and Research Center of Environmental Science and Engineering ( email )

Junjie Zhu

affiliation not provided to SSRN ( email )

No Address Available

Lingyun Feng

affiliation not provided to SSRN ( email )

No Address Available

Yingjian Wu

affiliation not provided to SSRN ( email )

No Address Available

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