镉铅复合胁迫下根表铁锰氧化胶膜厚度对美洲商陆富集镉的影响

发布时间：2018-02-01 12:58

本文关键词： 美洲商陆铁锰氧化胶膜镉铅复合胁迫富集可溶性糖可溶性蛋白　出处：《环境科学学报》2017年01期 　论文类型：期刊论文

【摘要】：为了探讨根表铁锰氧化胶膜厚度及共存离子铅(Pb)对美洲商陆富集镉(Cd)影响,采用水培的方法,诱导培育了胶膜厚度具有极显著差异的美洲商陆(低膜美洲商陆、中膜美洲商陆和高膜美洲商陆),分别进行低Cd低Pb、低Cd高Pb、高Cd低Pb、高Cd高Pb等4种不同金属组合的胁迫处理,观察美洲商陆生长状况、测定植株对Cd的富集量、抗胁迫生理活性物质的表达量.结果表明:中膜和高膜美洲商陆侧根发达,新生根较多,高Cd胁迫对根系发育有较强的抑制作用.高Cd条件下,植株对Cd的富集量为高膜美洲商陆中膜美洲商陆低膜美洲商陆,高膜美洲商陆Cd总富集量可达89765.69 mg·kg-1(以干重计).低Cd条件下,植株对Cd的富集量为低膜美洲商陆高膜美洲商陆中膜美洲商陆.高Pb处理,可提高低膜和高膜美洲商陆Cd富集量,但显著降低中膜美洲商陆Cd富集量.根系分泌的可溶性还原糖含量、叶及根部合成的可溶性蛋白含量与根表铁锰氧化胶膜的厚度成正相关.中膜和高膜美洲商陆叶片及根部可溶性蛋白含量还受到不同金属组合胁迫的影响.镉铅复合胁迫使美洲商陆叶片及根部可溶性蛋白含量极显著高于对照组.
[Abstract]:In order to study the effect of the thickness of iron-manganese oxide film and the coexisting ion lead Pbon on the enrichment of cadmium and cadmium in pokeweed, the hydroponic method was used. The American pokeweed (low film poplar, middle film poplar and high film American pokeweed), which had very significant difference in film thickness, were induced to carry out low CD, low CD, high CD and low Pb, respectively. Four different metal combinations, including high CD and high Pb, were used to observe the growth of pokeweed and to determine the accumulation of CD in plants. The results showed that the lateral roots of Phytolacca americana were well developed and the new rooting was more. High CD stress had a strong inhibitory effect on root development. The concentration of CD in plants was high film, medium film and low film of American poplar. The total concentration of CD in pokeweed with high film can reach 89765.69 mg 路kg ~ (-1) (measured by dry weight, under the condition of low CD). The concentration of CD in plants was low film, high film, high film, and high Pb treatment could increase CD accumulation of low film and high film American pokeweed. However, CD concentration and soluble reducing sugar content in roots were significantly decreased. The content of soluble protein in leaves and roots was positively correlated with the thickness of iron and manganese oxide film on root surface. The contents of soluble protein in leaves and roots of pokeweed were also affected by different metal combinations. The content of soluble protein in leaves and roots of pokeweed was significantly higher than that in control group.
【作者单位】：福建师范大学生命科学学院;
【基金】：福建省自然科学基金(No.2013J01123)~~
【分类号】：X173
【正文快照】： 1引言(Introduction)铁锰氧化胶膜常见于水生或湿地植物根表,例如:紫菀、羊胡子草、半边莲、水稻、芦苇、香蒲等(Batty et al.,2000),X-射线荧光显微断层图谱显示植物根表铁锰氧化胶膜的主要组成是铁锰氧化物及其水合物.由于锰膜形成需要的氧化还原电位比铁膜高,所以植物根表

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