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| 外来入侵植物黄顶菊生长及生理生态特性对镉胁迫的响应 |
| Growth, physiological and ecological responses of invasive plant Flaveria bidentis to Cd stress |
| Received:February 05, 2019 |
| DOI：10.13254/j.jare.2019.0091 |
| 中文关键词: 黄顶菊，重金属胁迫，表型可塑性，Cd富集，生态适应性 |
| 英文关键词: Flaveria bidentis, heavy metal stress, phenotypic plasticity, Cd enrichment, ecological adaptability |
| 基金项目:中国农业科学院科技创新工程协同创新任务（CAAS-XTCX2016015）；国家自然科学基金青年科学基金项目（31401811）；天津市应用基础与前沿技术研究计划青年项目（15JCQNJC15300） |
| Author Name | Affiliation | E-mail | | ZHANG Si-yu | Agro-Enviromental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Plant Protection College, Shenyang Agricultural University, Shenyang 100161, China | | | TIAN Jia-yuan | Agro-Enviromental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | QI Xiao-xu | Agro-Enviromental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Plant Protection College, Shenyang Agricultural University, Shenyang 100161, China | | | LIU Hong-mei | Agro-Enviromental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | YANG Dian-lin | Agro-Enviromental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | WANG Hui | Agro-Enviromental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | wanghui03@caas.cn |
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| 中文摘要: |
| 为明确外来入侵植物黄顶菊对重金属污染生境的生态适应性，本研究采用网室盆栽试验，研究不同浓度镉（Cd）污染对黄顶菊的生长、生理生态特性的影响及黄顶菊对Cd的富集特征，探讨黄顶菊对Cd耐受性的获得机理。结果表明：高浓度（8 mg·kg-1）Cd处理显著抑制黄顶菊的生长，株高、根长和生物量均随Cd浓度的升高表现出降低趋势；Cd处理下黄顶菊叶片丙二醛（MDA）含量及DCF荧光强度随重金属Cd浓度升高呈现逐渐增加的趋势，表明活性氧含量增加，在低（2 mg·kg-1）、中浓度（4 mg·kg-1）Cd污染下黄顶菊通过提高超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）活性清除细胞活性氧，而高浓度（8 mg·kg-1）Cd污染下抗氧化酶活性均降低；Cd在黄顶菊植株体内含量表现为根 > 叶 > 茎的规律，随着Cd胁迫浓度的升高植株体内重金属含量呈现逐渐增加的趋势，根部、地上部Cd富集量和转移系数呈现先升高后降低的趋势。Cd胁迫下，黄顶菊根、叶生物量和Cd富集等指标的表型可塑性指数（PPI）较高（>0.5），表明黄顶菊可能主要通过维持根和叶生物量积累营养物质，并调节Cd在体内的富集与转移来适应重金属污染生境。 |
| 英文摘要: |
| To clarify the ecological adaptability of the invasive plant Flaveria bidentis to heavy metal-contaminated habitats, we simulated habitats with different concentrations of cadmium(Cd)by pot experiments, and the plasticity of responses of growth, and physiological and ecological characteristics as well as heavy metal enrichment characteristics in response to the environmental stress were studied. Additionally, the tolerance mechanisms of plant were further explored. The results showed that high concentration heavy metal treatment(8 mg·kg-1)significantly inhibited the growth and biomass of Flaveria bidentis, both of which showed a decreasing trend with the increase of Cd concentration; The content of malondialdehyde(MDA)and the fluorescence intensity of DCF increased gradually with the increase of Cd concentration, which indicated the active oxygen content increased. Under low(2 mg·kg-1)and medium(4 mg·kg-1)concentrations of cadmium, the Flaveria bidentis reduced its active oxygen content by increasing superoxide dismutase(SOD), peroxidase(POD)and catalase (CAT)activities. However, the activities of antioxidant enzymes decreased under the high concentration(8 mg·kg-1)treatment; The content of Cd in the tissues of Flaveria bidentis showed the rule of root > leaf > stem. With the increase of Cd concentration, the content of heavy metals in the tissues increased gradually, and the Cd concentration and transfer coefficient in the roots and aboveground parts increased first and then decreased. Under heavy metal stress, the phenotypic plasticity index(PPI)of root biomass, leaf biomass and heavy metal enrichment of Flaveria bidentis was higher(>0.5),which indicated that Flaveria bidentis may accumulate nutrients mainly through root and leaf biomass processes, and regulate the enrichment and transfer of heavy metals in the body to adapt to heavy metal polluted habitats. |
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