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Type: Artigo de periódico
Title: Expression profile of oxidative and antioxidative stress enzymes based on ESTs approach of citrus
Author: Peroni, Luis Antonio
Ferreira, Renato Rodrigues
Figueira, Antonio
Machado, Marcos Antonio
Stach-Machado, Dagmar Ruth
Abstract: Plants not only evolve but also reduce oxygen in photosynthesis. An inevitable consequence of this normal process is the production of reactive oxygen species (ROS). Plants are adequately protected by the presence of multiple antioxidative enzymes in the cytosol and also in the different cell organelles such as chloroplasts, mitochondria, and peroxisomes. Traditionally, ROS were considered to be only a toxic byproduct of aerobic metabolism. However, recently it has become apparent that plants actively produce these molecules which may control many different physiological processes such as abiotic and biotic stress response, pathogen defense and systemic signaling. The search results using the Citrus Genome Program in Brazil (CitEST) for oxidative stress and the antioxidant enzyme system in Citrus Sinensis variety ?Pera IAC? indicated that the multiple ROS-scavenging enzymes were expressed throughout all citrus tissues. The analyses demonstrated the ubiquitous expression of metallothioneins, probably indicating a constitutive expression pattern. Oxalate oxidase has been identified as the most abundant expressed gene in developing fruits, which suggests a specific function in the ripening of citrus fruit. Moreover, infected leaves with Xylella fastidiosa and Leprosis citri showed a massive change in their ROS gene expression profile which may indicate that the suppression of ROS detoxifying mechanisms may be involved in the induction of the diseases.
Subject: citrus
reactive oxygen species
oxidative stress enzyme
Editor: Sociedade Brasileira de Genética
Rights: aberto
Identifier DOI: 10.1590/S1415-47572007000500016
Date Issue: 1-Jan-2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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