Journal Article

Differential Expression of CuZn- and Fe-Superoxide Dismutase Genes of Tobacco during Development, Oxidative Stress, and Hormonal Treatments

Jasmina Kurepa, Didier Hérouart, Marc van Montagu and Dirk Inzé

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 4, pages 463-470
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029190
Differential Expression of CuZn- and Fe-Superoxide Dismutase Genes of Tobacco during Development, Oxidative Stress, and Hormonal Treatments

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Chloroplasts of Nicotiana tabacum have two superoxide dismutases: a Fe- and a CuZn-containing enzyme, encoded by the nuclear genes sodB and sodCp, respectively. As a first step in studying the physiological function of these two enzymes, we compared the expression of sodB and sodCp in different plant organs, in response to hormonal treatments, and upon treatment with paraquat and Norflurazon. The sodCp transcript and active enzyme were detected only in young leaves of mature plants. The sodB transcript was more abundant in young compared to old leaves, but the enzymatic activity was higher in mature and senescent leaves. sodCp and sodB exhibited a different expression pattern upon treatment with abscisic acid, indole-3-acetic acid, kinetin, gibberellin, and 1-aminocyclopro-pane-l-carboxylate. Paraquat treatment caused a decrease in abundance of both transcripts, although the dose dependency of this decrease differed. Norflurazon-induced photooxidation resulted in a 10-fold increase of sodCp mRNA whereas the sodB transcript level was 25% higher than the control. These differences in expression might explain why both plastid-located superoxide dismutase enzymes are needed, particularly under stress conditions.

Keywords: Chloroplastic superoxide dismutases; Developmental regulation of sod genes; Hormonal regulation of sod genes; Nicotiana tabacum; Norflurazon; Paraquat

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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