Plant responses to stresses: role of ascorbate peroxidase in the antioxidant protection

Genetics and Molecular Biology

Andréia Caverzan²  Gisele Passaia²  Silvia Barcellos Rosa¹  Carolina Werner Ribeiro¹  Fernanda Lazzarotto²  Márcia Margis-pinheiro² 

[1] ,Universidade Federal Rio Grande do Sul Departamento de Genética Programa de Pós-Graduação em Genética e Biologia MolecularPorto Alegre RS ,Brazil

关键词: ascorbate peroxidase;    antioxidant system;    reactive oxygen species;    abiotic stress;    mutant plants;   

DOI  :  10.1590/S1415-47572012000600016

来源: SciELO

【 摘 要 】

When plants are exposed to stressful environmental conditions, the production of Reactive Oxygen Species (ROS) increases and can cause significant damage to the cells. Antioxidant defenses, which can detoxify ROS, are present in plants. A major hydrogen peroxide detoxifying system in plant cells is the ascorbate-glutathione cycle, in which, ascorbate peroxidase (APX) enzymes play a key role catalyzing the conversion of H2O2 into H2O, using ascorbate as a specific electron donor. Different APX isoforms are present in distinct subcellular compartments, such as chloroplasts, mitochondria, peroxisome, and cytosol. The expression of APX genes is regulated in response to biotic and abiotic stresses as well as during plant development. The APX responses are directly involved in the protection of plant cells against adverse environmental conditions. Furthermore, mutant plants APX genes showed alterations in growth, physiology and antioxidant metabolism revealing those enzymes involvement in the normal plant development.

【 授权许可】

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