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Systematic evaluation of ramie (Boehmeria nivea L.) for phytoremediation of cadmium contaminated soil and the mechanism of microbial regulation.

Authors :
Chen, Kunmei
Li, Yulan
Yu, Chunming
Chen, Ping
Chen, Jikang
Gao, Gang
Wang, Xiaofei
Xiong, Heping
Zhu, Aiguo
Source :
Chemosphere. Oct2023, Vol. 337, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

Ramie is an ideal crop for remediation of cadmium (Cd) contaminated soil. However, there is a lack of rapid and effective evaluation system for Cd tolerance of ramie germplasms, and also a lack of systematic and in-depth research under Cd contaminated field conditions. This study innovatively developed a rapid screening system of "hydroponics-pot planting", and 196 core germplasms were used to quickly and effectively identify their Cd tolerance and Cd enrichment capacity. Then, two excellent varieties were selected to carry out a 4 years of field experiment under Cd contaminated field to study the remediation model, evaluation of reuse after repair and the mechanism of microbial regulation. The results showed that ramie adopted the cycle mode of "Absorption-activating soil Cd-Migration-Absorption" to remediate on Cd contaminated field, and the application of ramie for remediation had good ecological and economic benefits. Ten dominant genera such as Pseudonocardiales , as well as the key functional genes (mdtC, mdtB, mdtB/yegN, actR, rpoS, and ABA transporter gene) in rhizosphere soil, were identified to participate in activating Cd in rhizosphere soil and promoting ramie to enrich Cd. This study provides a technical route and practical production experience for the research field of phytoremediation of heavy metal pollution. [Display omitted] • A rapid screening system was innovatively developed to identify Cd tolerant ramie germplasms. • A cycle remediation on ramie was revealed base on a field long-term remediation experiment. • Microbial regulation mechanism was revealed on field experiment. • Key genes in rhizosphere soil were identified to involve in regulating ramie to absorb Cd. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00456535
Volume :
337
Database :
Academic Search Index
Journal :
Chemosphere
Publication Type :
Academic Journal
Accession number :
165041253
Full Text :
https://doi.org/10.1016/j.chemosphere.2023.139298