文献类型： 外文期刊
作者： Lu, Yang 1 ; Wang, Qi-fu 2 ; Li, Jun 1 ; Xiong, Jiang 2 ; Zhou, Luo-na 2 ; He, Sheng-ling 2 ; Zhang, Jie-qiong 4 ; Chen, 1 ;
作者机构： 1.Guizhou Inst Technol, Coll Food & Pharmaceut Engn, Guiyang 550003, Guizhou, Peoples R China
2.Guizhou Acad Agr Sci, Guizhou Biotechnol Inst, Guiyang 550006, Guizhou, Peoples R China
3.Guizhou Key Lab Agr Biotechnol, Guiyang 550006, Guizhou, Peoples R China
4.Guizhou Gen Stn Crop Technol Promot, Guiyang 550001, Guizhou, Peoples R China
期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）
ISSN： 2045-2322
年卷期： 2019 年 9 卷
页码：
收录情况： SCI
摘要： Supplying exogenous sulfur-rich compounds increases the content of glutathione(GSH) and phytochelatins(PCs) in plant tissues, enabling plants to enhance their cellular defense capacity and/or compartmentalize Cadmium(Cd) into vacuoles. However, the mechanism by which surplus S modulates tolerance to Cd stress in different tissues need further investigation. In the present study, we found that supplementing the tartary buckwheat(Fagopyrum tararicum) exposed to Cd with surplus S reversed Cd induced adverse effects, and increased Cd concentrations in roots, but decreased in leaves. Further analysis revealed that exogenous S significantly mitigated Cd-induced oxidative stress with the aids of antioxidant enzymes and agents both in leaves and roots, including peroxidase(POD), ascorbate peroxidase(APX), glutathione peroxidase(GPX), glutathione S-transferase(GST), ascorbic acid(AsA), and GSH, but not superoxide dismutase(SOD) and catalase(CAT). The increased Cd uptake in root vacuoles and decreased translocation in leaves of exogenous S treated plants could be ascribed to the increasing Cd binding on cell walls, chelation and vacuolar sequestration with helps of non-protein thiols(NPT), PCs and heavy metal ATPase 3(FtHMA3) in roots, and inhibiting expression of FtHMA2, a transporter that helps Cd translocation from roots to shoots. Results provide the fundamental information for the application of exogenous S in reversal of heavy metal stress.
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