Selenium- and chitosan-modified biochars reduce methylmercury contents in rice seeds with recruiting Bacillus to inhibit methylmercury production
文献类型： 外文期刊
作者： Guo, Pan 1 ; Du, Hongxia 2 ; Zhao, Wancang 3 ; Xiong, Bingcai 2 ; Wang, Mingxing 4 ; He, Mingyan 5 ; Flemetakis, Emmanouil 6 ; Haensch, Robert 7 ; Ma, Ming 1 ; Rennenberg, Heinz 1 ; Wang, Dingyong 4 ;
作者机构： 1.Southwest Univ, Coll Resources & Environm, Ctr Mol Ecophysiol CMEP, Chongqing 400715, Peoples R China
2.Southwest Univ, Coll Resources & Environm, Chongqing Key Lab Bioresource Bioenergy, Chongqing 400715, Peoples R China
3.Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing 400715, Peoples R China
4.Coll Resources & Environm, Chongqing Key Lab Agr Resources & Environm, Chongqing 400715, Peoples R China
5.Chongqing Ecol Environm Monitoring Ctr, Chongqing 401147, Peoples R China
6.Agr Univ Athens, Dept Biotechnol, Lab Mol Biol, Athens 11855, Greece
7.Tech Univ Carolo Wilhelmina Braunschweig, Inst Plant Biol, Humboldtstr 1, D-38106 Braunschweig, Germany
关键词： Biochar; Methylmercury; Paddy soil; Microbes; Network
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：12.2； 五年影响因子：11.9 ）
ISSN： 0304-3894
年卷期： 2024 年 465 卷
页码：
收录情况： SCI
摘要： Biochar could reshape microbial communities, thereby altering methylmercury (MeHg) concentrations in rice rhizosphere and seeds. However, it remains unclear whether and how biochar amendment perturbs microbe -mediated MeHg production in mercury (Hg) contaminated paddy soil. Here, we used pinecone-derived bio-char and its six modified biochars to reveal the disturbance. Results showed that selenium-and chitosan-modified biochar significantly reduced MeHg concentrations in the rhizosphere by 85.83% and 63.90%, thereby decreasing MeHg contents in seeds by 86.37% and 75.50%. The two modified bicohars increased the abundance of putative Hg-resistant microorganisms Bacillus, the dominant microbe in rhizosphere. These re-ductions about MeHg could be facilitated by biochar sensitive microbes such as Oxalobacteraceae and Sub-group_7. Pinecone-derived biochar increased MeHg concentration in rhizosphere but unimpacted MeHg content in seeds was observed. This biochar decreased the abundance in Bacillus but enhanced in putative Hg methylator Desulfovibrio. The increasing MeHg concentration in rhizosphere could be improved by biochar sensitive microbes such as Saccharimonadales and Clostridia. Network analysis showed that Saccharimonadales and Clostridia were the most prominent keystone taxa in rhizosphere, and the three biochars manipulated abundances of the microbes related to MeHg production in rhizosphere by those biochar sensitive microbes. Therefore, selenium-and chitosan-modified biochar could reduce soil MeHg production by these microorganisms, and is helpful in controlling MeHg contamination in rice.
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