硫、硅对水稻体内NPT含量及镉亚细胞分布的影响

发布时间：2018-03-14 04:30

本文选题：水稻　切入点：硫　出处：《土壤通报》2016年05期 　论文类型：期刊论文

【摘要】：在4 mg kg~(-1)的镉污染条件下,设置不同的外源硫和硅供应水平,对辽星1号和沈农315两个品种的水稻进行了土培实验,在分蘖期对辽星1号水稻进行了亚细胞分析,观察在不同条件下重金属镉的亚细胞分布;并在分蘖期测定植株茎叶部分的非蛋白巯基(NPT)含量,研究不同硫硅配比对水稻吸收分配重金属的机理。结果表明,沈农315号水稻叶当中的NPT含量高于辽星1号,外源硫可以提升两个品种水稻叶中的NPT含量,增强对重金属的耐性,同时增加镉在包括液泡在内的细胞可溶部分的分布;施硅可以强化细胞壁,随着施硅量的提升,根茎叶细胞壁中的镉分布均显著提升,并且根细胞壁中的提升幅度大于茎,说明施硅不仅可钝化土壤中的镉,并且在植物体内,加强根细胞壁对镉的固化是硅增强植物体重金属抗性的主要途径。
[Abstract]:Under the condition of cadmium pollution of 4 mg kg 路kg ~ (-1), soil culture experiments were carried out on two rice varieties, Lioxing 1 and Shennong 315, with different levels of exogenous sulfur and silicon. Subcellular analysis of Liaoxing 1 rice was carried out at tillering stage. The subcellular distribution of heavy metal cadmium was observed under different conditions, the content of NPT in stem and leaf of plant was determined at tillering stage, and the mechanism of absorption and distribution of heavy metals in rice with different ratio of sulfur and silicon was studied. The content of NPT in the leaves of Shennong 315 was higher than that of Lioxing 1. Exogenous sulfur could increase the content of NPT in the leaves of two rice varieties, enhance the tolerance to heavy metals, and increase the distribution of cadmium in the soluble parts of cells, including vacuoles. Application of silicon can strengthen the cell wall. With the increase of the amount of silicon applied, the distribution of cadmium in the cell wall of rhizome and leaf is significantly increased, and the lifting range in the cell wall of root is larger than that in stem, which indicates that silicon application can not only passivate cadmium in soil, but also in plants. Strengthening the solidification of root cell wall to cadmium is the main way to enhance the resistance of silicon to heavy metals in plants.
【作者单位】：沈阳农业大学土地与环境学院;
【基金】：2012年辽宁省科学研究一般项目(L2012241)资助
【分类号】：X53;S511

【相似文献】