摘要
为探讨薄荷(Mentha haplocalyx Briq.)耐受和富集重金属铬的生理机制,采用盆栽法研究不同质量浓度、不同时间Cr6+处理对薄荷根系活力、叶绿素含量、不同器官中抗氧化酶(SOD、POD、CAT)活性和丙二醛(MDA)含量的影响。结果表明,随着Cr6+质量浓度梯度和时间的增加,薄荷根系活力与对照相比,呈下降趋势;相反,MDA含量呈增加趋势。叶绿素a、叶绿素b和类胡萝卜素含量随Cr6+质量浓度的增加呈先升后降的趋势。SOD、POD、CAT3种酶活性随Cr6+质量浓度的增加呈先升后降的趋势,在Cr6+质量浓度为40mg/L时,三者均出现峰值,3种酶活性随时间呈增加趋势。在Cr6+质量浓度超过40mg/L时,薄荷的抗氧化酶系统受到损害,无法对铬胁迫做出积极的响应,植株生长受到影响。
A experiment of pot culture was carried out to investigate the effects of chromium on root system vigor,chlorophyll content,antioxidant enzymes activities and MDA content of Mentha haplocalyx Briq..It was observed that with the increasing of chromium concentrations and time,root system vigor decrease dcontinuously;on the contrary,MDA content of different organs increased;antioxidant enzymes activities reached a peak at 40 mg/L of chromium,then decreased;chlorophyll content increased then decreased with the increasing of chromium concentrations.The results suggested that antioxidant enzymes might play importantroles to Mentha haplocalyx Briq.to chromium stress.Above 40 mg/L of chromium,the antioxidant enzymes would be destroyed and the growth of plants would be bad.
出处
《中国农学通报》
CSCD
北大核心
2011年第4期115-119,共5页
Chinese Agricultural Science Bulletin
基金
西南大学人才引进项目(207011)
关键词
薄荷
铬
根系活力
叶绿素含量
抗氧化酶
丙二醛
Mentha haplocalyx Briq.
chromium
root system vigor
chlorophyll content
antioxidant enzymes
MDA
