Overexpression of an Arabidopsis Peroxisomal Ascorbate Peroxidase Gene in Tobacco Increases Protection Against Oxidative Stress
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概要
- 論文の詳細を見る
The Arabidopsis gene APX3 that encodes a putative peroxisomal membrane-bound ascorbate peroxidase was expressed in transgenic tobacco plants. APX3-expressing lines had substantial levels of APX3 mRNA and protein. The H_2O_2 can be converted to more reactive toxic molecules, e.g. OH, if it is not quickly removed from plant cells. The expression of APX3 in tobacco could protect leaves from oxidative stress damage caused by aminotriazole which inhibits catalase activity that is found mainly in glyoxysomes and peroxisomes and leads to accumulation of H_2O_2 in those organelles. However, these plants did not show increased protection from oxidative damage caused by paraquat which leads to the production of reactive oxygen species in chloroplasts. Therefore, protection provided by the expression of APX3 seems to be specific against oxidative stress originated from peroxisomes, not from chloroplasts, which is consistent with the hypothesis that APX3 is a peroxisomal membrane-bound antioxidant enzyme.
- 日本植物生理学会の論文
著者
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Wang Jing
Department of Environmental Health, School of Medicine, University of Yamanashi
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Zhang Hong
Department Of Nuclear Medicine Second Affiliated Hospital Of Zhejiang University School Of Medicine
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Allen R
Texas Tech Univ. Tx Usa
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Allen Randy
Department of Biological Sciences, Texas Tech University
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Wang Jing
Department Of Echocardiography Union Hospital Tongji Medical College Huazhong University Of Science
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Zhang Hong
Department Of Biological Sciences Texas Tech University
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Allen Randy
Department Of Biological Sciences Texas Tech University
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Wang Jing
Department Of Biological Sciences Texas Tech University
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