Sulfur fertilization and water management ensure phytoremediation coupled with argo-production by mediating rhizosphere microbiota in the Oryza sativa L.-Sedum alfredii Hance rotation system

Yabei Qiao; Dandi Hou; Zhi Lin; Shuai Wei; Jiuzhou Chen; Jiahao Li; Jie Zhao; Kuan Xu; Lingli Lu; Shengke Tian

doi:10.1016/j.jhazmat.2023.131686

Sulfur fertilization and water management ensure phytoremediation coupled with argo-production by mediating rhizosphere microbiota in the Oryza sativa L.-Sedum alfredii Hance rotation system

J Hazard Mater. 2023 Sep 5:457:131686. doi: 10.1016/j.jhazmat.2023.131686. Epub 2023 May 23.

Authors

Yabei Qiao¹, Dandi Hou², Zhi Lin¹, Shuai Wei¹, Jiuzhou Chen¹, Jiahao Li¹, Jie Zhao¹, Kuan Xu¹, Lingli Lu¹, Shengke Tian³

Affiliations

¹ MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Subtropic Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China.
² State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, School of Marine Sciences, Ningbo University, Ningbo 315211, China.
³ MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Subtropic Soil and Plant Nutrition, Zhejiang University, Hangzhou 310058, China. Electronic address: tiansk@zju.edu.cn.

PMID: 37270958
DOI: 10.1016/j.jhazmat.2023.131686

Abstract

Sulfur (S) fertilizers, water management and crop rotation are important agronomic practices, related to soil heavy metal bioavailability. However, the mechanisms of microbial interactions remain unclear. Herein, we investigated how S fertilizers (S⁰ and Na₂SO₄) and water management affected plant growth, soil cadmium (Cd) bioavailability, and rhizospheric bacterial communities in the Oryza sativa L. (rice)-Sedum alfredii Hance (S. alfredii) rotation system through 16S rRNA gene sequencing and ICP-MS analysis. During rice cultivation, continuous flooding (CF) was better than alternating wetting and drying (AWD). CF treatment decreased soil Cd bioavailability by the promotion of insoluble metal sulfide production and soil pH, thus lowering Cd accumulation in grains. S application recruited more S-reducing bacteria in the rhizosphere of rice, whilst Pseudomonas promoted metal sulfide production and rice growth. During S. alfredii cultivation, S fertilizer recruited S-oxidizing and metal-activating bacteria in the rhizosphere. Thiobacillus may oxidize metal sulfides and enhance Cd and S absorption into S. alfredii. Notably, S oxidation decreased soil pH and elevated Cd content, thereby promoting S. alfredii growth and Cd absorption. These findings showed rhizosphere bacteria were involved in Cd uptake and accumulation in the rice-S. alfredii rotation system, thus providing useful information for phytoremediation coupled with argo-production.

Keywords: Alternating wetting and drying; Bacterial community; Cd contamination; Continuous flooding; Crop rotation.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Bacteria / genetics
Biodegradation, Environmental
Cadmium / analysis
Fertilization
Fertilizers / analysis
Microbiota*
Oryza*
Plant Roots / microbiology
RNA, Ribosomal, 16S / analysis
Rhizosphere
Sedum*
Soil / chemistry
Soil Pollutants* / analysis
Sulfides / analysis
Sulfur / analysis
Water Supply

Substances

Cadmium
RNA, Ribosomal, 16S
Fertilizers
Soil Pollutants
Soil
Sulfur
Sulfides