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| Effects of selenium on the uptake and transport of trace elements by cadmium-stressed flowering Chinese cabbage |
| Received:July 31, 2017 |
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| KeyWord:cadmium;selenium;flowering cabbage;trace element;absorption;transport |
| Author Name | Affiliation | E-mail | | LIU Shuai | Public Monitoring Center for Agro-product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510460, China
Laboratory of Quality & Safety Risk Assessment for Agro-products(Guangzhou), Ministry of Agriculture, Guangzhou 510460, China | | | WU Zhi-chao | Public Monitoring Center for Agro-product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510460, China
Laboratory of Quality & Safety Risk Assessment for Agro-products(Guangzhou), Ministry of Agriculture, Guangzhou 510460, China | | | ZHAO Ya-rong | Public Monitoring Center for Agro-product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510460, China
Laboratory of Quality & Safety Risk Assessment for Agro-products(Guangzhou), Ministry of Agriculture, Guangzhou 510460, China | | | ZHANG Wei-jie | Public Monitoring Center for Agro-product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510460, China
Laboratory of Quality & Safety Risk Assessment for Agro-products(Guangzhou), Ministry of Agriculture, Guangzhou 510460, China | | | WANG Fu-hua | Public Monitoring Center for Agro-product of Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510460, China
Laboratory of Quality & Safety Risk Assessment for Agro-products(Guangzhou), Ministry of Agriculture, Guangzhou 510460, China | wfhwqs@163.com |
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| Abstract: |
| The present study evaluated the effects of selenium(Se; 1 μmol·L-1 or 5 μmol·L-1) on the uptake and transport of trace elements(Fe, Mn, Cu, and Zn) by cadmium(Cd; 1 μmol·L-1 or 5 μmol·L-1)-stressed flowering Chinese cabbage(Brassica campestris L. ssp. chinensis var.Utilis) plants by monitoring the concentrations of trace elements in the apoplast, symplast, cell walls, xylem, and plant tissues(shoots and roots). Se application significantly increased the shoot and root biomass of Cd-stressed plants. High Cd stress(5 μmol·L-1) reduced the concentrations of Fe, Mn, and Zn in root tissues and increased the concentration of Cu, whereas the high Se treatment(5 μmol·L-1) markedly elevated the concentrations of Fe, Cu, and Zn to 19.8%, 46.7%, and 26.2% in shoot tissues, respectively, although not in root tissues. High Cd stress reduced the concentrations of Fe, Mn, and Zn to 20.4%, 23.8%, and 16.4% in root apoplasts, and 20.7%, 11.7%, and 27.2% in root symplasts, while increased the concentration of Cu. The high Se treatment significantly increased the concentrations of Fe, Cu, and Zn in the apoplasts of high Cd-stressed plants by 16.9%, 34.9%, and 26.0%, respectively, and increased the concentrations of Fe, Mn, Cu, and Zn in the symplasts of high Cd-stressed plants by 13.3%, 13.6%, 41.9%, and 28.3%, respectively. The application of Se to high Cd-stressed plants significantly increased the concentrations of Cu and Zn in the xylem sap to 44.2% and 16.9%, respectively, but had no significant effect on either Fe or Mn. Therefore, the findings of the present study indicate that exogenous Se alleviates Cd stress by enhancing both the uptake of the trace elements in root symplasts and apoplasts and the translocation of absorbed trace elements in the xylem of flowering Chinese cabbage, thereby regulating the supply of trace elements to aboveground tissues and maintaining their balance. |
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