<br>红泥基钝化剂重塑的根际细菌群落对于减少食用苋菜中土壤 Cd 积累至关重要,Science of the Total Environment

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红泥基钝化剂重塑的根际细菌群落对于减少食用苋菜中土壤 Cd 积累至关重要
Science of the Total Environment ( IF 8.2 ) Pub Date : 2022-02-26 , DOI: 10.1016/j.scitotenv.2022.154002
Zhi-Min Xu ₁ , Yu-Xue Zhang ₂ , Lei Wang ₃ , Chun-Guang Liu ₃ , Wei-Min Sun ₄ , Yi-Fan Wang ₅ , Sheng-Xing Long ₆ , Xiao-Tong He ₂ , Zheng Lin ₂ , Jia-Lin Liang ₂ , Jie-Xiang Zhang ₇

Affiliation

Engineering and Technology Research Center for Agricultural Land Pollution Prevention and Control of Guangdong Higher Education Institutes, College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China; Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin 300350, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 510632, China.
Engineering and Technology Research Center for Agricultural Land Pollution Prevention and Control of Guangdong Higher Education Institutes, College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin 300350, China.
National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China; School of Environment, Henan Normal University, Xinxiang 453007, China.
Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan.
College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China.

不断有报道称，赤泥（RM）可以固定土壤镉（Cd）并减少作物对 Cd 的吸收，但很少有研究调查 RM 是否以及如何影响根际细菌群落，这是决定 Cd 生物利用度和植物生长的重要因素。为了解决这个问题，使用高通量测序和生物信息学来分析 RM 应用减少食用苋菜中 Cd 积累的微生物机制。基于多个统计模型（Detrended correspondence analysis、Bray-Curtis、weighted UniFrac 和 Phylogenetic tree），本研究发现 RM 不仅通过增加根际土壤 pH 值来降低植物中 Cd 含量，而且通过重塑根际细菌群落。与优先定植于根际的植物的生长促进、抗病能力和 Cd 抗性相关的特殊分类群（Alphaproteobacteria， Gammaproteobacteria， Actinobacteriota 和 Gemmatimonadota）。此外，RM 通过上调细胞内有机代谢途径和下调细胞运动代谢途径，显著促进了土壤微生物的增殖和微生物生物膜的形成，这些微生物代谢物/微生物生物膜（例如有机酸、碳水化合物、蛋白质、S2− 和 PO43−）和微生物细胞通过生物吸附和化学螯合固定了根际土壤 Cd。本研究揭示了重塑的根际细菌群落在降低 RM 应用后植物 Cd 含量中的重要作用。

"点击查看英文标题和摘要"

Rhizobacteria communities reshaped by red mud based passivators is vital for reducing soil Cd accumulation in edible amaranth

Red mud (RM) was constantly reported to immobilize soil cadmium (Cd) and reduce Cd uptake by crops, but few studies investigated whether and how RM influenced rhizobacteria communities, which was a vital factor determining Cd bioavailability and plant growth. To address this concern, high-throughput sequencing and bioinformatics were used to analyze microbiological mechanisms underlying RM application reducing Cd accumulation in edible amaranth. Based on multiple statistical models (Detrended correspondence analysis, Bray-Curtis, weighted UniFrac, and Phylogenetic tree), this study found that RM reduced Cd content in plants not only through increasing rhizosphere soil pH, but by reshaping rhizobacteria communities. Special taxa (Alphaproteobacteria, Gammaproteobacteria, Actinobacteriota, and Gemmatimonadota) associated with growth promotion, anti-disease ability, and Cd resistance of plants preferentially colonized in the rhizosphere. Moreover, RM distinctly facilitated soil microbes' proliferation and microbial biofilm formation by up-regulating intracellular organic metabolism pathways and down-regulating cell motility metabolic pathways, and these microbial metabolites/microbial biofilm (e.g., organic acid, carbohydrates, proteins, S2−, and PO43−) and microbial cells immobilized rhizosphere soil Cd via the biosorption and chemical chelation. This study revealed an important role of reshaped rhizobacteria communities acting in reducing Cd content in plants after RM application.

更新日期：2022-02-26

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