| 郭堤,管伟豆,张洋,刘翔宇,李一曼,张增强.雪里蕻对于Cd、Zn的耐性及富集特性研究[J].农业环境科学学报,2020,39(10):2151-2161. |
| 雪里蕻对于Cd、Zn的耐性及富集特性研究 |
| Tolerance and bioaccumulation characteristics of Cd and Zn by potherb mustard |
| 投稿时间：2020-09-05 |
| DOI：10.11654/jaes.2020-1028 |
| 中文关键词: 重金属 培养方式 富集 生理特征 雪里蕻 |
| 英文关键词: heavy metal cultivation patterns accumulation physiological characteristics potherb mustard |
| 基金项目:国家重点研发计划项目（2017YFD0801101） |
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| 摘要点击次数: 1266 |
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| 中文摘要: |
| 利用不同培养方式（土培和砂培）探讨了梯度浓度Cd、Zn胁迫下雪里蕻的重金属富集特性、耐受性及生理响应，以期为雪里蕻修复重金属污染场地提供基础理论依据。结果表明：雪里蕻种子发芽率受到Cd、Zn胁迫的抑制，在18.3%~37.8%之间；Cd、Zn胁迫下雪里蕻的茎叶和根系表现出不同程度的毒害症状，土培雪里蕻生物量在0.78~10.60 g之间，砂培生物量在1.83~3.16 g之间；土培和砂培雪里蕻叶片中叶绿素、可溶性蛋白含量均随Cd、Zn浓度升高呈下降趋势，雪里蕻通过调节体内抗氧化酶的活性来缓解由Cd、Zn胁迫引起的氧化应激；雪里蕻植株内（茎叶和根系） Cd、Zn含量随生长基质中Cd、Zn浓度的增加呈线性增长趋势，土培各处理下雪里蕻植株内最高可富集Cd、Zn的浓度分别为80 mg·kg-1和3 318 mg·kg-1，砂培下为129 mg·kg-1和5 195 mg·kg-1。根据雪里蕻植物提取指数计算结果可知，不同培养方式下雪里蕻对Cd、Zn胁迫具有较强的耐受性和富集、转运能力（且Cd>Zn），具有较大的潜力用于修复Cd/Zn中、低污染程度的土壤。 |
| 英文摘要: |
| 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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