摘要
采用盆栽的方法研究紫花苜蓿(Medicago sativa)对镉(Cd)胁迫的生理响应及积累特性。结果表明,Cd浓度低于25 mg·kg-1可以促进紫花苜蓿地上部和地下部的生长。随着Cd浓度提高,紫花苜蓿相对电导率和叶绿素含量降低,脯氨酸含量呈现先增大后减小的趋势,且在25 mg·kg-1时达到最高。Cd在紫花苜蓿体内表现为地下部>地上部,随着Cd浓度增大,紫花苜蓿地上部和地下部Cd含量逐渐增大,转运指数和耐性指数先增大后减小。Cd浓度为25和100 mg·kg-1时,地上部和地下部Cd积累量最大,每盆分别为42.5和26.11μg。综合分析紫花苜蓿的生长、生理变化及富集能力表明,紫花苜蓿适用于浓度小于25 mg·kg-1的Cd污染土壤修复。
The physiological response of Medicago sativa to cadmium stress and accumulation property were studied with pot experiment.The results showed that the growth of M.sativa was promoted when the concentration of Cd less than 25mg·kg-1.With the increased concentration of Cd in the medium,relative conductivity chlorophyll contents all decreased,proline contents increased first,then decreased,and reached the highest at Cd level of 25mg·kg-1.The distribution of Cd in M.sativa was root>shoot.With the increased concentration of Cd in the medium,Cd content in shoot and root increased,translocation factor and tolerance factor increased first,then decreased.When the concentration of Cd were 25 and 100 mg·kg-1,the Cd content were reached the highest in shoot and root which were 42.5 and 26.11μg per pot,respectively.It could be concluded that M.sativa was suitable for remediation of Cd polluted soil when Cd concentration was less than 25mg·kg-1.
出处
《草业科学》
CAS
CSCD
北大核心
2015年第4期581-585,共5页
Pratacultural Science
基金
中央高校基本科研业务费专项资金(YX2015-10)
关键词
紫花苜蓿
镉胁迫
生理变化
积累特性
Medicago sativa
Cd stress
physiological changes
accumulation property
