土壤亚铁、镉对水稻2种抗氧化酶和植株富集镉量的影响
我国南方潴育及潜育型水稻土中积累有大量亚铁,有研究表明土壤亚铁会影响镉在植株中的富集及镉对植株的氧化性胁迫。试验设置4个土壤Fe^2＋水平（外源加入亚铁分别为0 mg/kg、100 mg/kg、200 mg/kg和400 mg/kg）和2个Cd^2＋水平（外源加入镉分别为0 mg/kg和5 mg/kg）,研究不同亚铁和镉的共同作用对孕穗期水稻叶片脂质过氧化、抗氧化酶活性以及对根膜和植株中重金属累积量的影响。在无外源亚铁添加的条件下,镉使叶片中脂质过氧化的监测指标丙二醛（malondialdehyde,MDA）含量下降了31.1%,同时抑制了超氧化物歧化酶（superoxide dismutas...
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| Published in | 浙江大学学报（农业与生命科学版） Vol. 42; no. 1; pp. 89 - 98 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
浙江大学环境与资源学院,杭州,310058
2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1008-9209 |
| DOI | 10.3785/j.issn.1008-9209.2015.07.011 |
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| Summary: | 我国南方潴育及潜育型水稻土中积累有大量亚铁,有研究表明土壤亚铁会影响镉在植株中的富集及镉对植株的氧化性胁迫。试验设置4个土壤Fe^2＋水平（外源加入亚铁分别为0 mg/kg、100 mg/kg、200 mg/kg和400 mg/kg）和2个Cd^2＋水平（外源加入镉分别为0 mg/kg和5 mg/kg）,研究不同亚铁和镉的共同作用对孕穗期水稻叶片脂质过氧化、抗氧化酶活性以及对根膜和植株中重金属累积量的影响。在无外源亚铁添加的条件下,镉使叶片中脂质过氧化的监测指标丙二醛（malondialdehyde,MDA）含量下降了31.1%,同时抑制了超氧化物歧化酶（superoxide dismutase,SOD）和过氧化物酶（peroxidase,POD）活性。随着土壤亚铁量的增加,特别是在外源添加亚铁400 mg/kg时,镉对水稻植株产生的上述影响得到了缓解。随着土壤亚铁量的升高,水稻的根膜、根和叶片对重金属镉的富集呈下降的趋势,且试验表明水稻根及叶片对镉的积累与根际膜中含镉量呈显著正相关。研究表明土壤中亚铁量的增加会降低水稻中镉的积累。 |
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| Bibliography: | YE Xinyi, ZHAO Xing, WANG Xiaopeng, ZHONG Yiming, YANG Jingping （College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China） 33-1247/S rice; iron plaque; lipid peroxides; superoxide dismutase; peroxidase Divalent heavy metal cation cadmium （Cd^2＋ ） causes phytotoxicity in plants. The high bioaccumulation index in plants and soil will also threat the human health through food chain. It has been shown that Cd will inhibit germination of seeds and exert a wide range of adverse effects on growth and metabolism of plants. It was reported that high concentration of Fe^2＋ in paddy soil could exert some impacts on plant growth and Cd^2＋ accumulation. Cadmium and ferrous with high concentration in soil, are known to cause oxidative damage to plants either directly or indirectly by triggering an increased level of production of reactive oxygen species （ROS）. Plants have antioxidative enzymes, such as superoxide dismutase （SOD）, catalase and peroxidase （POD）, which can scavenge ROS to avoid |
| ISSN: | 1008-9209 |
| DOI: | 10.3785/j.issn.1008-9209.2015.07.011 |