| Pb、Ni胁迫对大羽藓抗氧化酶系统的影响 |
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| 引用本文： | 孙守琴,何明,曹同,程颂,宋洪涛. Pb、Ni胁迫对大羽藓抗氧化酶系统的影响[J]. 应用生态学报, 2009, 20(4): 937-942 |
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| 作者姓名： | 孙守琴 何明 曹同 程颂 宋洪涛 |
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| 作者单位： | 1.中国科学院成都山地灾害与环境研究所， 成都 610041;2.上海交通大学农业与生物学院， 上海 200240;3.上海师范大学生命与环境科学学院， 上海 200234 |
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| 基金项目： | 上海市教育委员会重点项目 |
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| 摘 要： | 研究了Pb、Ni单一及复合胁迫下大羽藓细胞活性氧自由基的累积与清除、光合系统和膜系统的受损情况及其抗氧化酶系统的变化.结果表明：在较低胁迫浓度(Pb<0.1 mmol·L-1，Ni<0.01 mmol·L-1)下，大羽藓叶绿素含量具有应激效应，在较高胁迫浓度(Pb>0.1 mmol·L-1，Ni>0.01 mmol·L-1)下则具有抑制效应;随Pb-Ni复合胁迫浓度的增加，苔藓活性氧自由基和丙二醛的累积量逐渐增大;大羽藓超氧化物歧化酶和过氧化氢酶活性降低，过氧化物酶活性增加，过氧化物酶在清除Pb、Ni胁迫产生的活性氧自由基的过程中起着重要作用.大羽藓丙二醛含量和过氧化氢酶活性对Pb、Ni胁迫具有浓度依赖性，可以将其作为监测该类重金属污染的生物标志物.
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| 关 键 词： | 杂草稻 光合速率 蒸腾速率 水分利用效率 |
| 收稿时间： | 2008-08-29 |
Effects of Pb and Ni stress on antioxidant enzyme system of Thuidium cymbifolium. |
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| SUN Shou-qin,HE Ming,CAO Tong,CHENG Song,SONG Hong-tao. Effects of Pb and Ni stress on antioxidant enzyme system of Thuidium cymbifolium.[J]. The journal of applied ecology, 2009, 20(4): 937-942 |
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| Authors: | SUN Shou-qin HE Ming CAO Tong CHENG Song SONG Hong-tao |
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| Affiliation: | 1.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;2.School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 200240, China;3.College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, China |
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| Abstract: | This paper studied the accumulation and scavenging of active oxygen radicals, injury of photosynthetic system and membrane system, and changes of antioxidant enzyme system in Thuidium cymbifolium cells under single and combined stress of Pb and Ni. Under low concentration of Pb and Ni (Pb<01 mmol·L-1，Ni<001 mmol·L-1), the chlorophyll content of T. cymbifolium increased; while under high concentration of Pb and Ni (Pb>01 mmol·L-1, Ni>001 mmol·L-1), it was in adverse. There was a dose-dependent accumulation of reactive oxide species (ROS) and malondialdehyde (MDA) under combined Pb and Ni stress. The superoxide dismutase (SOD) and catalase (CAT) activities decreased while the peroxidase (POD) activity increased with increasing Pb and Ni concentration, indicating the important role of POD in eliminating ROS under Pb and Ni stress. The dose-dependent change of MDA content and CAT activity under Pb and Ni stress suggested that T. cymbifolium could be used as a biomarker in pollution monitoring of these two heavy metals. |
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| Keywords: | weedy rice photosynthetic rate transpiration rate water use efficiency. |
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