摘要
以乡土野生花卉楔叶菊(Chrysanthemum naktongense)为研究材料,研究其在不同浓度稀土元素镧(La)、铈(Ce)胁迫下的种子萌发、幼苗生理生化响应及富集特征。结果表明,随着La^(3+)、Ce^(3+)浓度的升高,楔叶菊种子萌发表现出“低促高抑”效应,幼苗地上及地下生物量未发生显著变化,而耐性指数均大于0.5,说明幼苗对于稀土元素的耐受性均较高。La^(3+)胁迫下,楔叶菊幼苗抗氧化系统指标(CAT、SOD、MDA、POD)活性整体呈现显著升高趋势^(3+)Ce^(3+)胁迫下,CAT、MDA、POD整体呈现上升趋势,抗氧化系统指标的升高增强了植物的抗氧化应激水平。楔叶菊根部更容易积累La^(3+)、Ce^(3+)元素,而转移系数均小于0.5,说明由根系向上转移的能力不强。这些结果表明楔叶菊对La^(3+)、Ce^(3+)没有超富集作用,但具有较高的耐受性,根部具有一定的富集作用,可作为La^(3+)、Ce^(3+)污染土壤区域植被恢复的绿化植物使用。
The Chrysanthemum naktongense,a native wild flower,was used as the research material to study its seed germination,seedling physiological and biochemical responses and enrichment characteristics as treated with different concentrations of rare earth elements lanthanum(La)and cerium(Ce).The results showed that low concentration of La^(3+) and Ce^(3+) promoted the germination of C.naktongense seeds,high concentration inhibited the germination.With the increase of La^(3+) and Ce^(3+) concentrations,the aboveground and underground biomass of seedlings did not change significantly,but the tolerance index was greater than 0.5,indicating that the seedlings had high tolerance to rare earth elements.Under La^(3+) stress,the antioxidant system indexes(CAT,SOD,MDA,POD)activities of seedlings showed a significant increase overall.Under Ce^(3+) stress,CAT,MDA,POD showed upward trend.The antioxidant system indexes increased the antioxidant stress level of the plant.The roots of C.naktongense were more likely to accumulate La^(3+) and Ce^(3+) elements,but the transfer coefficient was less than 0.5,indicating that the ability to transfer upward from the root was not strong.These results showed that C.naktongense was not hyperaccumulation plant,but the roots have certain enrichment effect and high tolerance to La^(3+) and Ce^(3+).It could be used as a green plant for vegetation restoration in La^(3+) and Ce^(3+) contaminated soil regions.
作者
高耀辉
马明
魏光普
刘欣然
孙慧妍
GAO Yaohui;MA Ming;WEI Guangpu;LIU Xinran;SUN Huiyan(Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2022年第4期155-162,共8页
Journal of Arid Land Resources and Environment
基金
内蒙古自然科学基金(2020BS03010)
内蒙古自治区高等学校科学技术研究(NJZY20094)
内蒙古科技大学创新基金(2019QDL-B24)资助。
关键词
野生植物
稀土元素
高抗性
生理特性
富集特性
wild plants
rare earth elements
high resistance
physiological characteristics
enrichment characteristics
