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OALib Journal期刊
ISSN: 2333-9721
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藿香蓟（ageratumconyzoides）对土壤铅胁迫的生理响应
DOI: 10.3724/SP.J.1145.2011.00651, PP. 651-655
Keywords: 铅胁迫,藿香蓟,生理响应,sod,pod,cat
Abstract:
为了解日益增加的城市土壤铅（pb）胁迫对城市园林地被植物的影响，采用盆栽实验研究土壤pb胁迫对藿香蓟（ageratumconyzoides）叶片生理特性的影响.结果显示，pb胁迫处理降低了藿香蓟叶片的叶绿素总量及叶绿素a和b含量，质膜透性增大，丙二醛（mda）含量上升.随着pb浓度增加，同一时期内藿香蓟叶片sod、pod和cat酶活性均上升，但土壤pb浓度超过750mgkg-1或1000mgkg-1后保护酶活性开始逐渐下降.随着胁迫处理时间的延长，sod活性在d20、d40和d60时都高于胁迫处理d7时的活性，pod活性是在d20时急剧下降，cat活性则在胁迫处理d60时急剧下降.研究表明，藿香蓟能在一定程度上适应土壤pb胁迫，但pb胁迫浓度超过750mgkg-1后将影响其生理代谢过程.图4参20
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