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Reduced cadmium accumulation in tobacco by sodium chloride priming

文献类型： 外文期刊

作者： Yang, Jia-Shuo 1 ; Dai, Yanjiao 3 ; Liu, Yongjun 2 ; Duan, Shuhui 2 ; Li, Yang-Yang 2 ; Hu, Risheng 2 ; Zhou, Zhicheng 2 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Tobacco Res, 11 Keyuanjingsi Rd, Qingdao 266101, Peoples R China

2.Central South Agr Expt Stn China Tobacco, 628 Furong Rd, Changsha 410004, Peoples R China

3.Hunan Acad Agr Sci, 892 Yuanda Rd, Changsha 410125, Peoples R China

关键词： Cadmium accumulation; Priming procedure; Salinity; Histological observation; Stele coarsening

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2020 年 27 卷 30 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) pollution threatens agricultural security worldwide. This study tested the efficacy of priming chemicals to decrease Cd uptake by tobacco plants (Nicotiana tabacum). After initial screening from nine different chemicals (NaCl, Cd(CH3COO)(2), Cd(NO3)(2), CdCl2, KHNO3, polyethylene glycol 6000 (PEG-6000), indole-3-acetic acid (IAA), ss-aminobutyric acid (BABA), and glutathione (GSH)), NaCl and PEG-6000 were further investigated because of their low risks to plant growth and efficiency to Cd reduction. Priming procedures (concentrations) were optimized for both chemicals and the best one (100 mM NaCl) was used to test both soil and hydroponic media. The results showed 31.3% lower Cd concentrations in shoots after priming with 100 mM NaCl. Phenotype parameters of the plants were also measured and showed no significant impacts of the priming procedures on the shoot biomass and the uptakes of nitrogen (N), phosphorus (P), and potassium (K), nor the photosynthetic capacity (net photosynthesis rate (Pn) and chlorophyll concentration (SPAD)). Histological observations of the roots showed a significant increase of the stele diameter after NaCl priming and a subsequent negative correlation between shoot Cd concentration and stele diameter was found after NaCl priming at different levels. This study confirmed 100 mM NaCl as an efficient priming treatment to decrease Cd uptake and the coarsening of the root stele was identified as a potential explanation for the observed decrease of Cd in tobacco shoots.

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