镉对不同生态型水稻的毒性及其在水稻体内迁移转运
作者简介:
胡莹(1963-),女,助理研究员,研究方向:污染生态,E-mail:huying@rcees.ac.cn
- 中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085
关键词:
- Cd /
- 水稻 /
- 生态型 /
- 毒性 /
- 转运系数
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10 μmol ·L-1 Cd浓度下生长3~14 d,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14 d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 Toxicity and Its Translocation in Two Ecotype Rice Cultivars
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Received Date:
2012-04-09
Fund Project:
Abstract: 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 of Yangdao 7 (P < 0.05) after exposure to 10 mol·L-1 Cd for 14 days. Cd translocation factor for K You 818 was 1.3~2.3 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 of Yangdao 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.
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