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当前位置: 首页 > 文章 > 高CO_2浓度对水稻叶片膜脂过氧化和抗氧化酶活性的影响 中国水稻科学 1999,13 (1)
Position: Home > Articles > Effect of Elevated CO_2 Concentration on Lipid Peroxidation and Activities of Antioxidative Enzymes in Rice Leaves Chinese Journal of Rice Science 1999,13 (1)

高CO_2浓度对水稻叶片膜脂过氧化和抗氧化酶活性的影响

作  者：
彭长连;林植芳;林桂珠
单  位：
中国科学院华南植物研究所
关键词：
高浓度CO2;过氧化氢酶;酶活性;膜脂过氧化;过氧化物酶;光氧化;超氧歧化酶
摘  要：
以４个栽培稻品种和２种野生稻为材料，比较了长期生长在高浓度ＣＯ２（６００ｕＬ／Ｌ）和普通空气ＣＯ２浓度（３５０ｕＬ／Ｌ）下抽穗期水稻叶片抗氧化酶活性的变化以及对甲基紫精光氧化的响应。在自然条件下其抗氧化酶（ＳＯＤ、ＣＡＴ和ＰＯＤ）活性因品种和种性的不同而存在一定的差异。与生长在普通空气ＣＯ２浓度的水稻相比，高浓度ＣＯ２下叶片的膜脂过氧化产物ＭＤＡ含量和ＰＯＤ活性都有不同程度下降，ＳＯＤ和ＣＡＴ活性则因品种的不同而呈不同的变化趋势。光氧化条件下，生长在普通空气ＣＯ２浓度下的水稻叶片ＣＡＴ活性增加了１．７～６．５倍，高浓度ＣＯ２下则增加了１．０～３．８倍，而ＳＯＤ和ＰＯＤ活性在光氧化条件下都降低。光氧化导致了水稻叶片的ＭＤＡ含量的增加，高浓度ＣＯ２下生长的水稻叶片ＭＤＡ含量增加的幅度小于在普通空气ＣＯ２浓度下生长的水稻，显示高浓度ＣＯ２对光氧化损伤具防护效应。
译  名：
Effect of Elevated CO_2 Concentration on Lipid Peroxidation and Activities of Antioxidative Enzymes in Rice Leaves
作  者：
PENG Changlian; LIN Zhifang; LIN Guizhu (South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650)
关键词：
carbon dioxide enrichment ; catalase ; enzyme activities ; lipid peroxidation; peroxidase ; photooxidation; superoxide dismutase
摘  要：
Four rice cultivars (Oryza sativa L. ) and two wild rice species (O. officinalis, O. spontanea) were grown under two big tents in the field and exposed to natural sunlight. The CO2 concentrations in these tents were kept at 350 uL/L(ambient) and 600 uL/L(elevated), respectively, which was monitored by an infrared CO2 analyzer and controlled by a computer. Under natural conditions, the activities of antioxidative enzymes (SOD, CAT, POD) in leaves of six rices differedwith their origin. In comparison to ambient CO2 control plants in the tents, the content of malondialdehyde (MDA) and PODactivity in rice leaves growing in the tent with elevated CO2 concentration decreased to different extents, but the activities ofSOD and CAT showed intraspecific variations. When leaf segments were submitted to methyl viologen photooxidation undera light intensity of 20 umol/m2·s, the activities of antioxidative enzymes showed significant changes. CAT activity was enhanced by 1. 7~ 6. 5 folds (at ambient CO2) and 1. 0-3. 8 folds (at elevated CO2 ) of untreated control. On the contrary, SODand POD activities were all reduced in leaves of three tested rices growing either at 350 uL/L or at 600 uL/L CO2. Photooxidation resulted in an increase of MDA content, but the MDA increment was inhibited by elevated CO2 concentration. The results indicated that activities of the three antioxidative enzymes in rice leaves were regulated by CO2 concentration and photooxidative condition. Elevated CO2 concentration showed a protective effect against the peroxidative damage of lipids inducedby methyl viologen photooxidation.

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