Effect of Silicon on Growth, Physiology, and Cadmium Translocation of Tobacco (Nicotiana tabacum L.) in Cadmium-Contaminated Soil

LU Yingang; MA Jun; TENG Ying; HE Junyu; Peter CHRISTIE; ZHU Lingjia; REN Wenjie; ZHANG Manyun; Shiping DENG

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Effect of Silicon on Growth, Physiology, and Cadmium Translocation of Tobacco (Nicotiana tabacum L.) in Cadmium-Contaminated Soil

机译：硅对镉污染土壤中烟草（Nicotiana tabacum L.）生长，生理和镉转运的影响

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Silicon (Si) offers beneficial effect on plants under cadmium (Cd) stress such as promoting plant growth and increasing resistance to heavy metal toxicity.In this study,a pot experiment was performed to study the role of Si in alleviating Cd toxicity in tobacco (Nicotiana tabacum L.) plants on a yellow soil taken from Guiyang,China.Nine treatments consisting of three concentrations of Cd (0,1,and 5 mg kg-1) together with three Si levels (0,1,and 4 g kg-1) were established.Plant growth parameters,Cd concentration,and the malondialdehyde (MDA),chlorophyll,and carotenoid contents were determined 100 d after transplanting of tobacco seedlings.Application of exogenous Si enhanced the growth of tobacco plants under Cd stress.When 5 mg kg-1 Cd was added,Si addition at 1 and 4 g kg-1 increased root,stem,and leaf biomass by 26.1％-43.3％,33.7％-43.8％,and 50.8％-69.9％,respectively,compared to Si addition at 0 g kg-1.With Si application,the transfer factor of Cd in tobacco from root to shoot under both 1 and 5 mg kg-1 Cd treatments decreased by 21％.The MDA contents in the Si-treated tobacco plants declined by 5.5％-17.1％ compared to those in the non-Si-treated plants,indicating a higher Cd tolerance.Silicon application also increased the chlorophyll and carotenoid contents by 33.9％-41％ and 25.8％-47.3％ compared to the Cd only treatments.Therefore,it could be concluded that Si application can alleviate Cd toxicity to tobacco by decreasing Cd partitioning in the shoots and MDA levels and by increasing chlorophyll and carotenoid contents,thereby contributing to lowering the potential health risks of Cd contamination.

机译：硅（Si）对镉（Cd）胁迫下的植物具有有益的作用，例如促进植物生长和增加对重金属毒性的抵抗力。在这项研究中，进行了盆栽试验，研究了Si在缓解烟草中Cd毒性方面的作用（烟草（Nicotiana tabacum L.）种植在来自贵阳的黄色土壤上。九种处理方法包括三种浓度的Cd（0.1和5 mg kg-1）和三种Si含量（0.1和4 g kg）建立-1）。在烟苗移栽100 d后测定植物生长参数，Cd浓度，丙二醛（MDA），叶绿素和类胡萝卜素含量。外源硅的施用促进了镉胁迫下烟草植株的生长。添加5 mg kg-1 Cd，添加1和4 g kg-1的Si分别使根，茎和叶生物量分别增加26.1％-43.3％，33.7％-43.8％和50.8％-69.9％。在0 g kg-1下添加到硅中。施用硅后，镉在烟草中从根到芽的转移因子1和5 mg kg-1 Cd处理量降低了21％。与未施Si的烟草相比，经Si处理的烟草植物中的MDA含量降低了5.5％-17.1％，表明对Cd的耐受性更高。与仅施用镉相比，施用硅还增加了33.9％-41％和25.8％-47.3％的叶绿素和类胡萝卜素含量。因此，可以得出结论，施用硅可通过减少芽中Cd的分配来减轻Cd对烟草的毒性。和MDA含量以及增加叶绿素和类胡萝卜素含量，从而有助于降低Cd污染的潜在健康风险。

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来源
《土壤圈（英文版）》 |2018年第4期|680-689|共10页
作者
LU Yingang; MA Jun; TENG Ying; HE Junyu; Peter CHRISTIE; ZHU Lingjia; REN Wenjie; ZHANG Manyun; Shiping DENG;
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作者单位

College of Agriculture, Guizhou University, Guiyang 550025 China;

College of Materials and Chemistry, Tongren University, Tongren 554300 China;

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

College of Agriculture, Guizhou University, Guiyang 550025 China;

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 China;

Department of Plant and Soil Sciences, Oklahoma State University, Stillwater OK 74078 USA;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
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Effect of Silicon on Growth, Physiology, and Cadmium Translocation of Tobacco (Nicotiana tabacum L.) in Cadmium-Contaminated Soil

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