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

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

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Título Plant responses to stresses : role ascorbate peroxidase in the antioxidant protection
Autor Caverzan, Andréia
Passaia, Gisele
Rosa, Sílvia Barcellos
Ribeiro, Carolina Werner
Lazzarotto, Fernanda
Margis-Pinheiro, Márcia
Abstract 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 ofAPX 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.
Contido em Genetics and molecular biology. Vol. 35, n. 4 supl (Dec. 2012), p. 1011-1019
Assunto Antioxidantes
Ascorbato
Estresse abiótico
Peroxidase
[en] abiotic stress
[en] antioxidant system
[en] ascorbate peroxidase
[en] mutant plants
[en] reactive oxygen species
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/87993
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