硫、硅对水稻体内NPT含量及镉亚细胞分布的影响  

The response of Non-protein Thiols and Subcellular Distribution of Cadmium in Rice to the Exogenous Sulfur and Silicon

作　　者：潘智立 李军[1] 

机构地区：[1]沈阳农业大学土地与环境学院,辽宁沈阳110866

出　　处：《土壤通报》2016年第5期1253-1258,共6页Chinese Journal of Soil Science

基　　金：2012年辽宁省科学研究一般项目(L2012241)资助

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。This research designed different supply levels of exogenous S and Si under the Cd contamination at 4 mg kg-1, analyzed the subcellular distribution of Cd and Non-protein thiol （NPT） in two types of rice, named Liaoxing 1st and Shennong 315, and explored the distribution mechanism of S and Si in rice in different treatments. The results showed that NFF content was higher in Shennong 315 than that in Liaoxing 1st . Exogenous S not only improved the content of NPT in both types of rice and enhanced the tolerance of Cd, but also facilitated the transportation of Cd to vacuole. Exogenous Si intensified cytoderm, and the Cd content in cytoderm of the plant, especially in the root, was increased with the increase of Si application. This result showed that Si fertilizer application not only passivated the Cd in soil, but intensified its chelate in cytoderm, which is one of the pathways of plant to resist heavy metals.

关 键 词：水稻 硫 硅 亚细胞分布 非蛋白巯基 

分 类 号：S158.4[农业科学—土壤学]