摘要
全氟辛烷磺酸(PFOS)作为一种新型持久性有机污染物,目前国内外对其生态毒性研究主要集中在水环境领域,而高等植物的生态毒性数据尚不完善。因此,本研究采用内培养方式,选取小麦、大麦、小白菜、三叶草、绿豆作为供试植物,利用根伸长、芽伸长、地上部分生物量等评价指标,研究了PFOS短期暴露对不同供试作物苗期生长的影响,建立了PFOS和作物苗期生长的剂量-效应关系,并对不同的评价指标进行相关性分析,筛选出表征PFOS生态毒性的敏感植物。结果表明,不同供试作物培育3d后,PFOS对其于不同毒性终点的最小EC50值为:小麦352 mg·kg-1(根伸长)、大麦434 mg·kg-1(根伸长)、三叶草794 mg·kg-1(地上部分生物量鲜重)、小白菜829 mg·kg-1(地上部分生物量鲜重)、绿豆>1 000 mg·kg-1,因此敏感程度依次为:小麦>大麦>三叶草>小白菜>绿豆。须根系作物小麦、大麦较直根系作物三叶草、小白菜和绿豆敏感,而须根系作物各评价指标的敏感程度依次为:根伸长>地上部分生物量鲜重>芽伸长>地上部分生物量干重,可见小麦的根伸长对PFOS污染最为敏感。各评价指标间均呈正相关关系,表明PFOS对同种植物的不同评价指标影响趋势一致。
PFOS is a new type of persistent organic pollutants （POPs） and most of its ecotoxiciy tests were fo- cused on the aquatic system. The research on phytotoficity of PFOS is stillmited. The aim of this paper is to investigate the influence of short-term exposure of PFOS on seedling growth of several different plants inclu- ding wheat, barley, Chinese cabbage, clover and mung bean. The root elongation, shoot elongation and the a- bove ground biomass were selected as different evaluation indices. The dose-response relationship between PFOS concentration and crop growth was established and the correlation was analyzed between different indi- ces, aiming to screen out the plant which was most sensitive to PFOS contamin＇ation. Results showed that thelowest EC50 for different endpoints for the selected crops were： wheat 352 mg·kg^-1（root elongation）, barley 434 mg·kg^-1 （root elongation）, clover 794 mg·kg^-1 （fresh weight of the above ground biomass）, cabbage 829 mg·kg^-1（fresh weight of the above ground biomass）, mung bean 〉 1 000 mg·kg^-1. Thus the decreasing order of phytotoxicity of PFOS for the selected crops were： wheat 〉 barley 〉 clover 〉 cabbage 〉 mung bean. Fi- brous root crops （wheat and barley） were more sensitive than straight root crops （clover, cabbage and mung bean）. The descending order of sensitivity for four evaluation indices was root elongation 〉 fresh weight of the above ground biomass 〉 shoot elongation 〉 dry weight of the above ground biomass. The root elonga- tion of wheat was the most sensitive indicator. The evaluation indices were positively related based on corre- lation analysis, indicating PFOS has identical influence on the different evaluation indices for each kind of plant.
出处
《生态毒理学报》
CAS
CSCD
北大核心
2013年第5期695-701,共7页
Asian Journal of Ecotoxicology
基金
国家高技术研究发展计划(863)项目(2012AA06A302)
