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首页> 外文会议>2009 ISEST;International symposium on environmental science and technology >Effects of Elevated Ozone Concentration on the Antioxidative System in Leaves of Soybean (Glycine max)
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Effects of Elevated Ozone Concentration on the Antioxidative System in Leaves of Soybean (Glycine max)

机译：臭氧浓度升高对大豆叶片抗氧化系统的影响

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摘要

In order to reveal effect mechanism of elevated ozone concentration on plants active oxygen species (AOS) and antioxidative system, open top chambers (OTCs) were utilized to investigate the change of the net photosynthetic rate, AOS, lipid peroxidation extent, content of antioxidant substance and antioxidative enzymes activities in soybean (Glycine max) leaves under different elevated ozone concentration. The results indicated that elevated ozone concentration induced a decrease on the net photosynthetic rate and the net photosynthetic rate decreased greatly with the increasing of ozone concentration; With the increase of ozone concentration, the bigger superoxide anion (O2) production rate, hydrogen peroxide (H2O2) content, content of malondialdehyde (MDA) and relative electrical conductivity increased gradually in soybean leaves; The activities of catalase (CAT) , peroxidase (POD) declined gradually with the increasing of ozone concentration, but there was no regular change observed in the activity of superoxide dismutase (SOD); Carotenoids (Car) content and ascorbic acid (ASA) content declined gradually. In whole growing season, MDA content, relative electrical conductivity and POD activity increased gradually with the fumigation time lengthening and the net photosynthetic rate, Car content and ASA content were higher earlier and lower later during the growth stages. But H2O2 content, O2 production rate decreased first during the flowering stages and increased later. But SOD activity increased gradually and CAT activity was enhanced during the flowering stages and weakened later. The results show that elevated ozone concentration accelerat ed AOS metabolism rates and reduced the anti-oxidative ability in soybean leaves, which decreased the net photosynthetic rate and photosynthesis was restrained.
机译：为了揭示臭氧浓度升高对植物活性氧（AOS）和抗氧化系统的作用机理，利用敞开式室（OTC）研究了净光合速率，AOS，脂质过氧化程度，抗氧化剂物质含量的变化。不同臭氧浓度下大豆（Glycine max）叶片的抗氧化和抗氧化酶活性结果表明，臭氧浓度升高引起净光合速率下降，净光合速率随臭氧浓度的增加而大大降低。随着臭氧浓度的增加，大豆叶片中超氧阴离子（O2）的产生速率，过氧化氢（H2O2）含量，丙二醛（MDA）含量和相对电导率逐渐增大;随着臭氧浓度的增加，过氧化氢酶（CAT），过氧化物酶（POD）的活性逐渐下降，但超氧化物歧化酶（SOD）的活性没有规律的变化。类胡萝卜素（Car）含量和抗坏血酸（ASA）含量逐渐下降。在整个生长季节中，随着熏蒸时间的延长，MDA含量，相对电导率和POD活性逐渐增加，并且在生长阶段，净光合速率，Car含量和ASA含量先升高后降低。但是在开花期，H2O2的含量，O2的产生率先下降，后上升。但在开花期，SOD活性逐渐增加，CAT活性增强，随后逐渐减弱。结果表明，臭氧浓度升高促进了AOS的代谢速率，降低了大豆叶片的抗氧化能力，降低了净光合速率，抑制了光合作用。

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