水稻镉离子流速的基因型差异及其与镉积累量的关系研究  

Genotypic Variation of Cd^(2+) Flux and Its Relationship with Cd Accumulation in Rice Plant

作　　者：韩立娜[1,2] 居学海[2] 张长波[2] 宋正国[2] 王景安[1] 刘仲齐[1,2] 

机构地区：[1]天津市动植物抗性重点实验室天津师范大学生命科学学院,天津300387 [2]农业部环境保护科研监测所生态毒理与环境修复研究中心,天津300191

出　　处：《农业环境科学学报》2014年第1期37-42,共6页Journal of Agro-Environment Science

基　　金：中央级公益性科研院所基本科研业务费专项资金(农业部环境保护科研监测所)资助项目(2013-szjj-lzq-04);2013年农业生态环境保护项目(2013-072)

摘　　要：为了研究水稻镉(Cd)积累量与其流速之间的关系,采用非损伤微测技术对四种基因型水稻根系不同部位和根茎维管束组织中的镉离子(Cd2+)流速进行了测定。结果表明,根系不同部位的Cd2+流速存在显著差异,伸长区的Cd2+流速显著大于根冠,根毛区和根毛,且在基因型间存在明显差异。根系伸长区维管束组织的最大Cd2+流速比其表皮细胞的流速大1倍以上,基因型间的差异较小。茎秆维管束组织中的Cd2+流速在基因型间的差异非常显著,T优705各部位的Cd2+流速都明显大于其他品种,且稳定性较好,致使其根系和地上部的Cd积累量也显著大于其他品种。根茎维管束组织中的Cd2+流速能够准确地反映不同水稻品种转运和积累Cd的潜力。Cadmium flux in plants varies among different genotypes. A study was conducted to measure the Cd2+flux rate(CFR)in different root regions as well as vascular bundle tissues of roots and stems of four rice(Oryza Sativa)genotypes using a Non-invasive Micro-test Technique(NMT). The CFR in rice roots had significant differences among different root regions and genotypes. It was obviously greater in the elongation region of root than in the root cap, root hair region and root hairs. Although the maximum CFR was over 2 time greater in vascular bundle tissue of root elongation region than in the epidermal cells of root, its variation among genotypes was not significant. However, the CFR in the vascular bundle tissues of stem showed a significant genotypic variation. The CFR in each part of the variety'T-you 705' was apparently higher and more stable than that in other genotypes, resulting in significantly higher Cd accumulations in roots and shoots of 'T-you 705'. Therefore, the CFR in the vascular bundle tissues of roots and stems could be used as an accurate indicator of Cd transport and accumulation potential in rice varieties.

关 键 词：水稻 Cd2+流速 Cd积累量 遗传差异 维管束组织 

分 类 号：S511[农业科学—作物学]