外源Na_2SeO_3和Na_2SiO_3对不同水稻拔节期镉吸收和积累的影响  

Effects of Na_2SeO_3 and Na_2SiO_3 on Cd uptake and accumulation in two different rice(Oryza Sativa L.) cultivars at jointing stage

作　　者：代邹[1,2] 余华清[1,2] 郭长春[1,2] 马均[1,2] 李娜[1,2] 杨志远[1,2] 徐徽[1] 孙永健[1,2] DAI Zou;YU Huaqing;GUO Changchun;MA Jun;LI Na;YANG Zhiyuan;XU Hui;SUN Yongjian(Rice Research Institute, Sichuan Agricultural University, Chengdu 611130, China;Key Laboratory of Crop Physiology Ecology, and Cultivation in Southwest China, Ministry of Agriculture, Chengdu 611130, China)

机构地区：[1]四川农业大学水稻研究所,成都611130 [2]农业部西南作物生理生态与耕作重点实验室,成都611130

出　　处：《浙江大学学报（农业与生命科学版）》2017年第4期441-450,共10页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：国家科技支撑计划项目(2013BAD07B13)

摘　　要：以2个不同籽粒Cd积累特性的杂交籼稻品种"宜香优2115"和"川谷优2348"为材料,通过盆栽试验研究基施Na_2SeO_3和Na_2SiO_3对水稻拔节期Cd吸收和积累的影响。结果表明:Na_2SiO_3可显著提高2个水稻品种根际土壤pH,并对2个水稻品种根系生长产生抑制作用;Na_2SeO_3和Na_2SiO_3使宜香优2115根表铁膜中Cd含量分别比对照下降8.5%和14.1%,使川谷优2348根表铁膜中Cd含量下降12.9%和39.4%;2个处理均降低了Cd从根向地上部的转运系数,进而减少其在地上部的含量;Na_2SeO_3和Na_2SiO_3使水稻的总Cd积累量显著下降,且使2个水稻品种地上部Cd积累量占总Cd积累量的比例也下降,而根和铁膜中Cd积累量占水稻总Cd积累量的比例在不同品种间存在差异,其中Na_2SeO_3和Na_2SiO_3主要改变宜香优2115铁膜中Cd积累量所占比例,而对川谷优2348根和铁膜中所占比例均有较大影响。相关分析结果显示,根表铁膜在本试验条件下是水稻Cd吸收的贮藏库。此外,Na_2SeO_3和Na_2SiO_3降低了2个供试品种籽粒成熟期的Cd含量,且对川谷优2348的降低效果优于宜香优2115,Na_2SiO_3处理的效果优于Na_2SeO_3。Cadmium(Cd)is one of the most important inorganic pollutants in the soil of China and can be readily assimilated into plants and transported to human bodies through food chain.Rice is the staple food in China and also the major source of dietary Cd intake by people.Therefore,it’s important to decrease the uptake and accumulation of Cd in rice for human health.The capacity of iron plaque to sequester heavy metals is well known,besides its possible role as a buffer and reservoir in heavy metal uptake.It is well documented that exogenous Na2SeO3or Na2SiO3can depress the Cd absorption in rice by changing its content in the iron plaque,but the comparative study of exogenous Na2SeO3or Na2SiO3on Cd uptake in different rice cultivars is limited.The aim of this study is to explore the effects of Na2SeO3and Na2SiO3on depressing Cd assimilation in different rice cultivars.

关 键 词：亚硒酸钠 硅酸钠 水稻 镉吸收 镉积累 

分 类 号：S511[农业科学—作物学] S143.7