生态环境学报2016，Vol.25Issue(2)：320-326,7.DOI:10.16258/j.cnki.1674-5906.2016.02.020
硒对水稻镉含量及其在亚细胞中的分布的影响
Mechanism of Se on Cd Content and Subcell Distribution in Rice
摘要
Abstract
This paper illustrated the effects of Se application on Cd accumulation and distribution in rice organs and subcellular to explore countermeasures for rice in microcosmic level. The study clarified the mechanism of Cd accumulation reduction in rice. The results were:(1) The dry matter weights of different organs are increased significantly with the increase of Se concentration under same Cd concentration. Under the concentrations of 2(Cd1)、4(Cd2)、8 (Cd3)and 16(Cd4) mg·kg-1 Cd, the dry matter weights of grain with 1.2 mg·kg-1 Se treatment are increased by 6.81%, 7.73%, 14.24%and 49.62%respectively compared to Se0. (2) When the added Cd concentration in soil is increased from 2 to 16 mg·kg-1, the Cd contents in different organs of rice,brown rice and polished rice are increased significantly.The Cd contents in brown rice are 0.23, 0.37 and 0.57 mg·kg-1 under the Cd2, Cd3 and Cd4 treatments without Se application, higher than the national food safety standards of China for Cd content (0.20 mg·kg-1). (3) The Cd contents and Cd accumulation amounts in different organs of rice and brown rice, polished rice are decreased significantly with the increase of Se concentration under the same Cd concentration, and larger declines of the Cd content are observed under 0.4 and 0.8 mg·kg-1 Se treatment, lower than the national food safety standards of China for Cd content (0.20 mg·kg-1). (4) Sequence of the Cd distribution in rice organs is roots > stems and leave > brown ric > polished rice. The Cd distribution portion in roots is enhanced with the increase of Se concentration as Cd distribution in other organs is declined at the same time. The Cd distribution portion in rice husk is increased with the increase of Se concentration, meanwhile, the Cd distribution portion in polished rice is decreased. Conclusions:Se application could reduce Cd concentration in rice plants, brown rice and polished rice, and reduce Cd transportation into polished rice. Se application shows the most significant inhibition effects to Cd poison by separating Cd in different cell areas.关键词
硒/镉/糙米/精米/镉含量/镉分配Key words
Se/Cd/brown rice/polished rice/Cd content/Cd distribution分类
资源环境引用本文复制引用
李虹颖,唐杉,王允青,刘英,郭熙盛..硒对水稻镉含量及其在亚细胞中的分布的影响[J].生态环境学报,2016,25(2):320-326,7.基金项目
安徽省自然科学基金面上项目（1408085MKL61）；安徽省科技攻关计划项目（1501031088）；安徽省农业科学院院长青年基金项目（13B1042；14B1047）；安徽省农业科学院学科建设项目（14A1009，16A1029）；安徽省农业科学院创新团队项目（14C1308）。 （）
