O papel das enzimas antioxidantes na defesa das plantas contra insetos herbívoros e fitopatógenos
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Data
2014
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Resumo
Many plants suffer significant biochemical changes in response the attack of biotic
stressors, such as phytopathogens or herbivorous insects. When any of these biotic
stressors attack plants, this causes quick responses via an "oxidative burst”, which
constitutes the production of reactive oxygen species (ROS), particularly superoxide
anion (O 2•- ) and hydrogen peroxide (H 2 O 2 ). The accumulation of these substances in
vegetal cells can be toxic to both the biotic stressors and plants. These ROS will
trigger molecules for the induction of defense genes and polymerization of proteins
that makes up the cell walls, as well as stimulate the production of antioxidant
enzymes or scavenging. There are a variety of these enzymes that will decompose
the reactive oxygen species; the superoxide dismutase (SOD), peroxidase (POX),
catalase (CAT) and polyphenol oxidase (PPO) are some examples. This review will
describe how herbivory and pathogenic triggers cause an oxidative burst stimulating
the defense system of the plants with the actions of antioxidant enzymes.
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Palavras-chave
Catalase, Estresse biótico, Peroxidase, Inseto, Fungo, Catalase, Peroxidase, Biotic stress, Insect, Fungus
Citação
NASCIMENTO, Jacqueline Barbosa; BARRIGOSSI, José Alexandre Freitas. O papel das enzimas antioxidantes na defesa das plantas contra insetos herbívoros e fitopatógenos. Agrarian Academy, Goiânia, v. 1, n. 1, p. 234-250, 2014.