Plant Physiology Preview
Published on May 2, 2002; 10.1104/pp.001362
Received December 7, 2001
Returned for revision January 23, 2002
Accepted March 20, 2002
Heat Stress- and Heat Shock Transcription Factor-Dependent
Expression and Activity of Ascorbate Peroxidase in
Arabidopsis
Irina I. Panchuk , Roman A. Volkov , and Friedrich Schöffl *
Zentrum für Molekularbiologie der Pflanzen (Center of Plant Molecular Biology), Allgemeine Genetik, Universität Tübingen, 72076 Tübingen, Germany
* Corresponding author; email: friedrich.schoeffl{at}zmbp.unituebingen.de.
To find evidence for a connection between heat stress response, oxidative stress, and common stress tolerance, we studied the effects of elevated growth temperatures and heat stress on the activity and expression of ascorbate peroxidase (APX). We compared wild-type Arabidopsis with transgenic plants overexpressing heat shock transcription factor 3 (HSF3), which synthesize heat shock proteins and are improved in basal thermotolerance. Following heat stress, APX activity was positively affected in transgenic plants and correlated with a new thermostable isoform, APXS. This enzyme was present in addition to thermolabile cytosolic APX1, the prevalent isoform in unstressed cells. In HSF3-transgenic plants, APXS activity was detectable at normal temperature and persisted after severe heat stress at 44°C. In nontransgenic plants, APXS was undetectable at normal temperature, but could be induced by moderate heat stress. The mRNA expression profiles of known and three new Apx genes were determined using real-time PCR. Apx1 and Apx2 genes encoding cytosolic APX were heat stress and HSF dependently expressed, but only the representations of Apx2 mRNA met the criteria that suggest identity between APXS and APX2: not expressed at normal temperature in wild type, strong induction by heat stress, and HSF3-dependent expression in transgenic plants. Our data suggest that Apx2 is a novel heat shock gene and that the enzymatic activity of APX2/APXS is required to compensate heat stress-dependent decline of APX1 activity in the cytosol. The functional roles of modulations of APX expression and the interdependence of heat stress and oxidative stress response and signaling mechanisms are discussed.
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