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Dynamic studies on the transport of micro-heavy metals in plant roots.

微量重金属在植物根系中转运的动态研究

基本信息

批准号：
60560073
负责人：
KAWASAKI T.
金额：
$ 1.09万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60560073/
关键词：
Absorption Cadmium Calcium Distribution in root Excised barley root Manganese Translocation オオムギ切断根

项目摘要

The effect of Ca on the absorption and translocation of Mn, Zn and Cd in excised barley roots was studied using a multi-compartment transport box technique. A radioisotope( <^(54)Mn> , <^(65)Zn> or <^(115m)Cd> ) -labelled test solution was supplied to the apexes of excised roots and the distribution pattern in the roots was examined in the absence or presence of Ca. Results obtained were as follows.Addition of Ca to the test solution reduced the absorption of Mn and inhibited drastically its translocation in excised roots. With increasing concentrations of Ca in test solutions, its inhibitory effects on the absorption and translocation of Mn became severe.Similar results were observed for the absorption and translocation of Zn. Ca in the test solution decreased the absorption and inhibited drastically the translocation of Zn; as in the case of Mn, higher concentrations of Ca had severe effects on these functions.It was also evident that the addition of Ca to the test solution reduced the absorption of Cd at all levels of Cd concentration (1, 10, and 100 <micro> M). Cd absorption decreased with increasing concentrations of Ca in the test solution. However, Ca accelerated the translocation of Cd in excised roots supplied with test solutions containing up to 10 <micro> M Cd. At 100 <micro> M Cd, addition of Ca caused a negligibly small acceleration of Cd translocation.The accelerating effect of Ca on Cd translocation, especially "xylem exudation", decreased markedly with the addition of 2,4-dinitrophenol, but not with the addition of chloramphenicol or p-chloromercuribenzene sulphonic acid. When barley plants were supplied with only Ca <SO_4> during the entire growing period, that is, plants were not supplied with nutrient solution on the last day of this period, Ca had no accelerating effect on Cd translocation in excised roots.

采用多室运输箱技术研究了Ca对Mn、Zn、Cd在大麦离体根中吸收和转运的影响。将放射性同位素（<^（54）Mn>、<^（65）Zn>或<^（115 m）Cd>）标记的测试溶液供应到离体根的顶端，并在不存在或存在Ca的情况下检查根中的分布模式。结果表明：在供试溶液中添加钙，可降低离体根对锰的吸收，并显著抑制其运转。随着Ca浓度的增加，其对Mn的吸收和转运的抑制作用逐渐增强，对Zn的吸收和转运的抑制作用也逐渐增强。在测试溶液中的钙降低了吸收和抑制急剧易位的锌，在锰的情况下，较高浓度的钙有严重的影响，这些functions.It也很明显，除了钙的测试溶液中减少镉的吸收，在所有水平的镉浓度（1，10，和100 <micro>M）。镉的吸收随着测试溶液中钙浓度的增加而降低。然而，钙加速易位的镉在离体根提供测试解决方案，含有高达10 <micro>M镉。在100 <micro>M Cd浓度下，Ca对Cd转运的促进作用可忽略不计，而2，4-二硝基苯酚则显著降低了Ca对Cd转运的促进作用，尤其是“木质部渗出”，而氯霉素和对氯汞苯磺酸对Ca的促进作用无明显影响。当大麦植株<SO_4>在整个生长期内只供应Ca时，即在此期间的最后一天不供应营养液时，Ca对离体根中Cd的转运没有加速作用。