摘要
采用溶液培养方法研究镉(Cd)对两种不同生态型水稻的毒性影响以及Cd在水稻体内的转运。结果表明,粳稻品种杨辐粳7号比籼稻品种K优818对Cd毒害反应更敏感。两种生态型水稻品种的根系对Cd的吸收积累差异比较大,在10μmol·L-1Cd浓度下生长3～14d,杨辐粳7号根系中Cd浓度比K优818高44.5%～99.5%,当Cd处理时间达到14d时,K优818茎叶中Cd积累量为杨辐粳7号的1.6倍(P<0.05)。K优818的Cd转运系数显著(P<0.05)高于杨辐粳7号,是杨辐粳7号的1.3～2.3倍,且随着Cd处理时间的延长K优818的Cd转运系数呈上升趋势,而杨辐粳7号的Cd转运系数却呈下降趋势,说明杨辐粳7号有较强的阻止Cd从根系向茎叶中转运的能力,所以可通过品种选育来降低Cd对人体健康的危害。
Cadmium （Cd） toxicity and its translocation in two different ecotype rice cultivars were investigated by using hydroponic experiment. The results showed that Yangdao 7 （Japonic rice） was more sensitive to Cd than that of KYou 818 （Indica rice）. Cd concentration in roots of Yangdao 7 was 44.5% - 99.5% higher than that of K You 818 after exposure to 10 mol.L-1 Cd for 3 - 14 days, while Cd quantity accumulation in shoots of K You 818 was 1.6 times ofYangdao 7 （P 〈0.05） after exposure to 10 mol.L-1 Cd for 14 days. Cd tmnslocation factor for K You 818 was 1.3 -23 times of Yangdao 7 （P 〈0.05）. And Cd translocation factor for KYou 818 increased with exposure time increasing, while that for Yangdao 7 decreased. These results indicated that Cd retention in roots ofYangdao 7 was higher than that of K You 818. Therefore, the health risk of Cd uptake through rice food could be decreased through variety screening.
出处
《生态毒理学报》
CAS
CSCD
北大核心
2012年第6期664-670,共7页
Asian Journal of Ecotoxicology
基金
国家水体污染控制与治理科技重大专项(2009ZX07212-001-05)
关键词
CD
水稻
生态型
毒性
转运系数
cadmium
rice
ecotype
toxicity
translocation factor
