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| Tolerance and bioaccumulation characteristics of Cd and Zn by potherb mustard |
| Received:September 05, 2020 |
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| KeyWord:heavy metal;cultivation patterns;accumulation;physiological characteristics;potherb mustard |
| Author Name | Affiliation | E-mail | | GUO Di | School of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710129, China
College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | GUAN Wei-dou | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHANG Yang | Xi'an Solid Waste Management Center, Xi'an 710038, China | | | LIU Xiang-yu | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | LI Yi-man | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHANG Zeng-qiang | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | zhangzq58@126.com |
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| Abstract: |
| Herein, the heavy metal accumulation, tolerance, and physiological response of potherb mustard are investigated under cadmium (Cd)and zinc(Zn)stress. This study aims to investigate the relationship between potherb mustard(Brassica juncea, Coss.), cultivation patterns(soil and sand cultures), and heavy metal, and provides a theoretical basis for site remediation by potherb mustard. The results showed that the germination of potherb mustard seeds was inhibited by the stress posed by Cd and Zn, ranging from 18.3% to 37.8%. The biomass of potherb mustard under soil and sand culture was between 0.78 and 10.60 g and 1.83 and 3.16 g, respectively. With an increase in the concentration of Cd and Zn, the contents of chlorophyll and soluble protein in the leaves of potherb mustard decreased. Potherb mustard adjusted the enzyme defense system to alleviate the oxidative stress caused by Cd and Zn. With an increase in the concentration of Cd and Zn in the growing substrate, the highest concentrations of Cd and Zn in the potherb mustard shoots were recorded as 80 and 3 318 mg·kg-1(soil culture)and 129 and 5 195 mg·kg-1(sand culture), respectively. According to the calculation of phytoextraction indices, potherb mustard showed strong tolerance to the Cd and Zn stress, accumulation, and translocation abilities(Cd>Zn). Potherb mustard is suggested to remediate Cd/Zn contaminated soils at medium and low levels. |
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