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Sulfur and water management mediated iron plaque and rhizosphere microorganisms reduced cadmium accumulation in rice

  • Soils, Sec 5 • Soil and Landscape Ecology • Research Article
  • Published:
Journal of Soils and Sediments Aims and scope Submit manuscript

Abstract

Purpose

Cadmium (Cd) accumulation in rice can be regulated by applying sulfur (S) fertilizers and water management, but the mechanism and the effect on soil microorganisms are unclear. This study aims to clarify the effect of sulfur forms on rice Cd accumulation and soil microbial community structure under different irrigation regimes.

Methods

The present study investigated the effects of sulfur fertilizers (S0 and Na2SO4) and water management by continuous flooding (flooded) and intermittent flooding and draining (Int-F3D5) on soil Cd bioavailability and the microbial community structure using inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy with energy dispersive X-ray spectrometry (SEM–EDS), and 16S rRNA gene sequencing technology.

Results

When flooded, S0 and Na2SO4 increased the dry weight of rice grain 2.3- and 0.9-fold, respectively, and reduced the Cd concentration by 152% and 61%, respectively. The ascorbic citrate acetic (ACA) extractable Fe content from flooded rice surface treated with S0 and Na2SO4 increased by 98% and 64%, respectively, indicating that the S fertilizer promoted iron plaque formation on the surfaces of rice roots. Gammaproteobacteria were the most predominant under all management conditions. Syntrophobacteraceae and Geobacter were particularly abundant in the rice rhizosphere treated with Int-F3D5 and exogenous Na2SO4, and it might play a crucial role in alleviating Cd stress caused by S fertilizer.

Conclusion

Under flooded conditions, S0 had a more significant effect on the reduction of cadmium uptake by rice. Sulfur fertilizers promoted iron plaque formation partially to hinder Cd accumulation. Under Int-F3D5 conditions, Na2SO4 recruited more beneficial rhizosphere bacteria, which may be a potential mechanism of reducing Cd transfer from soil to rice.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Abbreviations

ACA:

Ascorbic-citric-acetic acid

DTPA:

Diethylene triamine pentaacetic acid

EDTA:

Ethylene diamaine tetraacetic acid

GSH:

Glutathione

PCs:

Phytochelatins

ICP-MS:

Inductively coupled plasma mass spectrometry

SEM-EDS:

Scanning electron microscopy with energy dispersive X-ray spectrometry

LDA:

Least discriminant analysis

LSD:

Least significant difference

PCoA:

Principal coordinate analysis

SOB:

S-oxidizing bacteria

SRB:

S-reducing bacteria

PERMANOVA:

Permutational multivariate analysis of variance

References

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Funding

The present study was financially supported by the Zhejiang Provincial Natural Science Foundation of China (grant number LZ22D010004), the National Nature Science Foundation of China (grant number 41401366), and the National Key Research and Development Program of China (grant number 2016YFD0800805 and 2017YFD0801303).

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Authors and Affiliations

Authors

Contributions

Yili Zang and Jie Zhao: methodology, data curation, formal analysis, investigation, writing—original draft, writing—review, and editing. Weikang Chen: methodology, formal analysis, investigation, and visualization. Lingli Lu: writing—review and editing, supervision. Jiuzhou Chen: formal analysis and investigation. Zhi Lin: investigation. Yabei Qiao: investigation. Haizhong Lin: writing—review, and editing. Shengke Tian: conceptualization, supervision, funding acquisition, and project administration.

Corresponding author

Correspondence to Shengke Tian.

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Competing interests

The authors declare no competing interests.

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Responsible editor: Jizheng He

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Supplementary file1 (DOCX 161 kb)

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Zang, Y., Zhao, J., Chen, W. et al. Sulfur and water management mediated iron plaque and rhizosphere microorganisms reduced cadmium accumulation in rice. J Soils Sediments 23, 3177–3190 (2023). https://doi.org/10.1007/s11368-023-03537-4

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  • DOI: https://doi.org/10.1007/s11368-023-03537-4

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