...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Soil Bacteria Override Speciation Effects on Zinc Phytotoxicity in Zinc-Contaminated Soils
【24h】

Soil Bacteria Override Speciation Effects on Zinc Phytotoxicity in Zinc-Contaminated Soils

机译：土壤细菌覆盖形态对锌污染土壤锌植物毒性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effects of zinc (Zn) speciation on plant growth in Zn-contaminated soil in the presence of bacteria are unknown but are critical to our understanding of metal biodynamics in the rhizosphere where bacteria are abundant. A 6-week pot experiment investigated the effects of two plant growth promoting bacteria (PGPB), Rhizobium leguminosarum and Pseudomonas brassicacearum , on Zn accumulation and speciation in Brassica juncea grown in soil amended with 600 mg kg~(–1) elemental Zn as three Zn species: soluble ZnSO_(4) and nanoparticles of ZnO and ZnS. Measures of plant growth were higher across all Zn treatments inoculated with PGPB compared to uninoculated controls, but Zn species effects were not significant. Transmission electron microscopy identified dense particles in the epidermis and intracellular spaces in roots, suggesting Zn uptake in both dissolved and particulate forms. X-ray absorption near-edge structure (XANES) analysis of roots revealed differences in Zn speciation between treatments. Uninoculated plants exposed to ZnSO_(4) contained Zn predominantly in the form of Zn phytate (35%) and Zn polygalacturonate (30%), whereas Zn cysteine (57%) and Zn polygalacturonate (37%) dominated in roots exposed to ZnO nanoparticles. Inoculation with PGPB increased (>50%) the proportion of Zn cysteine under all Zn treatments, suggesting Zn coordination with cysteine as the predominant mechanism of Zn toxicity reduction by PGPB. Using this approach, we show, for the first time, that although speciation is important, the presence of rhizospheric bacteria completely overrides speciation effects such that most of the Zn in plant tissue exists as complexes other than the original form.
机译：在细菌存在下，锌（Zn）形态对受Zn污染的土壤中植物生长的影响尚不清楚，但对于我们了解细菌丰富的根际中的金属生物动力学至关重要。一个为期6周的盆栽实验研究了两种植物生长促进细菌（PGPB），豆科根瘤菌和铜绿假单胞菌对600 mg kg〜（–1）元素锌修正为3的土壤中芥菜的Zn积累和形态的影响。锌种类：可溶性ZnSO_（4）和ZnO和ZnS的纳米颗粒。与未接种的对照相比，接种PGPB的所有锌处理的植物生长指标均较高，但锌种类的影响并不显着。透射电子显微镜在根部的表皮和细胞内空间中发现了致密的颗粒，表明锌以溶解和颗粒形式吸收。根的X射线吸收近缘结构（XANES）分析显示，处理之间锌形态的差异。暴露于ZnSO_（4）的未接种植物主要以植酸锌（35％）和多半乳糖醛酸锌（30％）的形式包含锌，而半胱氨酸（57％）和多半乳糖醛酸锌（37％）的形式在暴露于ZnO纳米颗粒的根中占主导地位。 。在所有锌处理下，接种PGPB均可增加（> 50％）锌半胱氨酸的比例，这表明锌与半胱氨酸的配合是PGPB降低锌毒性的主要机制。使用这种方法，我们第一次表明，尽管物种形成很重要，但根际细菌的存在完全覆盖了物种形成的影响，因此植物组织中的大多数锌都以复合物的形式存在，而不是原始形式。

著录项

  • 来源
    《Environmental Science & Technology》 |2018年第6期|3412-3421|共10页
  • 作者

    Nyekachi C. Adele; Bryne T. Ngwenya; Kate V. Heal; J. Frederick W. Mosselmans;

  • 作者单位

    School of GeoSciences, University of Edinburgh, Edinburgh, U.K.;

    School of GeoSciences, University of Edinburgh, Edinburgh, U.K.;

    School of GeoSciences, University of Edinburgh, Edinburgh, U.K.;

    Diamond Light Source, Harwell Science and Innovation Campus, Didcot, U.K.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号