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富营养化污水对美人蕉生理特性的影响
尹程,王荣富,张云华
0
(安徽农业大学生命科学学院,合肥 230036; 安徽水利水电职业技术学院,合肥 231603)
摘要:
以美人蕉为材料,研究了富营养化污水中氮、磷浓度变化对美人蕉生理特性的影响。结果显示,富营养化污水明显影响美人蕉的生长,表现为生物量增加缓慢、叶绿素含量下降。高浓度的氮、磷引起美人蕉过氧化物酶、过氧化氢酶和超氧化物歧化酶等酶的活性持续升高,随着富营养化污水中氮、磷浓度的升高,3种酶的活性变幅明显减小,相反,美人蕉植株中的丙二醛含量却明显升高。研究表明美人蕉抗氧化酶系统的活性受到富营养化污水的干扰,清除活性氧能力有所下降,活性氧积累促进膜脂过氧化加快。这种变化可能是富营养化污水影响植物生长的原因之一,也可能是植物对富营养化污水修复效果的限制性因素之一。
关键词:  富营养化污水  美人蕉  生理特性  氧化胁迫  抗氧化酶系统
DOI:
基金项目:安徽水利水电职业技术学院校级科研项目(2011XJKY)资助。
The effect of eutrophic water on Canna indica physiological characteristics
YIN cheng,WANG Rong-fu,ZHANG Yun-hua
(School of Life Sciences, Anhui Agricultural University, Hefei 230036; Anhui Technical College of Water Resources and Hydroelectric Power, Hefei 231603)
Abstract:
The effect of eutrophic sewage water on plant physiological characteristics was investigated using Canna indica as materials. It was shown that eutrophic water significantly inhibited the growth of Canna indica, which was represented by the slow increase of biomass and the decrease of chlorophyll content. Furthermore,increased concentrations of N and P in eutrophic water led to the continuous increase of peroxidase, catalase and superoxide dismutase activities while the vibrating range decreased dramatically compared with the control. In addition, malondialdehyde content increased greatly in Canna indica under eutrophic water. These results demonstrated that in eutrophic water, the activites of active oxygen-scavenging enzymes(POD,SOD and CAT) of Canna indica were interrupted, resulting in decreased active oxygen scavenging capacity, intensified oxidative stress and more serious membrane lipid peroxidation, which might be one of the reasons leading to the effect of eutrophic water on plant growth and one of the limiting factors in eutrophic sewage remediation effect of plants.
Key words:  eutrophic water  Canna indica  physiological characteristics  oxidative stress  active oxygen-scavenging enzymes

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