重金属对莴苣种子萌发和幼苗生长的抑制效应  

Inhibition Effect of Heavy Metal on Seed Germination and Seedling Growth of Lettuce

作　　者：刘健晖[1,2] 周东升[1] 王芳宇[1] 蒋伍玖 任永霞 

机构地区：[1]湖南省衡阳师范学院生命科学系,湖南衡阳421008 [2]功能金属有机材料湖南省普通高校重点实验室,湖南衡阳421008 [3]湖南长沙宁乡县环境保护局,湖南宁乡410600

出　　处：《北方园艺》2014年第15期1-5,共5页Northern Horticulture

基　　金：国家自然科学基金资助项目(31201750);功能金属有机材料湖南省普通高校重点实验室开放基金资助项目(13K08);衡阳师范学院青年资助项目(11A30);衡阳师范学院2011年青年骨干教师资助项目

摘　　要：以莴苣种子为试材,采用水培方法,研究了重金属元素铜(Cu)、铬(Cr)、铅(Pb)对莴苣种子萌发、幼苗生长的影响。结果表明:Cu2+、Pb2+在低浓度(≤50mg/L)下与对照组相比,对莴苣种子萌发影响无显著差异(P>0.05),随着浓度的增高则逐渐转变为抑制作用,Gr6+对莴苣种子萌发有明显的抑制作用;Cu2+、Gr6+、Pb2+对幼苗生长均呈现抑制作用,且浓度越高,抑制作用越明显,3种重金属溶液处理对莴苣幼苗根的抑制率都要明显大于对芽的抑制率(P<0.05);莴苣种子根对3种重金属的敏感度强弱顺序为:KCr2O3>Pb(NO3)2>CuSO4。Taking lettuce as material, by hydroponic experiments,the effect of heavy metal elements Cu,Cr and Pb on seed germination and seedling growth were studied. The results showed that there was no significant difference （P〉0. 05） in germination index among treatments at the low concentration （450 mg/L） of Cu,Pb solution. The inhibitory effect of Cr solution was the most obvious,and with the increase of the concentration,the inhibition had risen sharply. The inhibitory effect of the three kinds of heavy metal solution on lettuce seedlings root were significantly greater than bud. The seedling root length and the shoot length were decreased, with the increase of salt concentration of heavy metals. And the toxicity of three kinds of heavy metal salts was KCr2O3〉Pb（NO3 ）2 〉CuSO4.

关 键 词：重金属 莴苣 种子萌发 幼苗生长 抑制效应 

分 类 号：Q945[生物学—植物学]