除草剂硝磺草酮对四尾栅藻和微囊藻的毒性研究  

A Study of the Toxicity of Mesotrione to Scenedesmus quadricauda and Microcystis sp.

作　　者：倪妍[1] 赖劲虎[1] 陈连水[2] 万金保[1] 

机构地区：[1]南昌大学环境与化学工程学院/鄱阳湖环境与资源利用教育部重点实验室,江西南昌330047 [2]东华理工大学生物系,江西抚州344000

出　　处：《江西农业大学学报》2014年第6期1258-1263,共6页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家"十一五"科技支撑计划重点项目(2007BAB23C02);南昌大学鄱阳湖环境与资源利用教育部重点实验室开放基金(Z04999);南昌大学校基金(Z04861)

摘　　要：应用急性毒性实验方法，对比研究硝磺草酮商品及其标准品对四尾栅藻（ Scenedesmus quadricauda）和微囊藻（Microcystis sp．）的生长及叶绿素a含量的影响，以了解新兴除草剂硝磺草酮对淡水微藻的毒性效应。结果表明：硝磺草酮商品及其标准品均能抑制四尾栅藻和微囊藻的生长，抑制程度与剂量正相关，且硝磺草酮商品的抑制作用更强；四尾栅藻和微囊藻在硝磺草酮商品处理5 d后的叶绿素a抑制率（27．8％～91．2％、27．2％～81．3％）高于标准品处理5 d后的叶绿素a抑制率（1％～51．2％、3．6％～52．6％），表明硝磺草酮商品的毒性高于其标准品；四尾栅藻对硝磺草酮商品及其标准品的敏感性高于微囊藻，在暴露初期其敏感性差异性最为明显，之后随暴露时间的延长而减小。To understand the toxic effects of both commercial and standard mesotrione on the growth and chlorophyll a content of Microcystis sp.andScenedesmus quadricauda,were investigated by means of acute toxicity experiment.The results indicated that the growth ofScenedesmus quadricauda andMicrocystis sp.were inhibited by both commercial and standard mesotrione,and significant correlation existed between the inhibition degree and the concentration.After 5 d,the chlorophyll a contents of Scenedesmus quadricauda andMicrocystis sp.were inhibited by 27.8%-91.2% and 27.2%-81.3% by commercial mesotrione,by 1%-51.2% and 3.6%-52.6%by standard mesotrione,respectively.The toxicity of commercial mesotrione was higher than that of standard mesotrione.Scenedesmus quadricauda was more sensitive than Microcystis sp.to both the compounds.

关 键 词：硝磺草酮 四尾栅藻 微囊藻 急性毒性 叶绿素A 

分 类 号：S481.1[农业科学—农药学] X171.5[农业科学—植物保护]