Plant and Cell Physiology, 1999, Vol. 40, No. 5 515-523
© 1999
Overproduction of Arabidopsis thaliana FeSOD Confers Oxidative Stress Tolerance to Transgenic Maize
1 Laboratorium voor Genetica, Department of Plant Genetics, Flanders Interuniversity Institute for Biotechnology (VIB), Universiteit Gent K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
2 Laboratorium voor Biofysica, Vrije Universiteit Brussel Pleinlaan 2, B-1050 Brussels, Belgium
3 Plant Genetic Systems N. V. J. Plateaustraat 22, B-9000 Gent, Belgium
4 Laboratoire Associé de l'Institut National de la Recherche Agronomique (France), Universiteit Gent B-9000 Gent, Belgium
5Fax 32-9-2645349; e-mail: mamon{at}gengenp.rug.ac.be
Transgenic maize (Zea mays L.) plants have been generated by particle gun bombardment that overproduce an Arabidopsis thaliana iron superoxide dismutase (FeSOD). To target this enzyme into chloroplasts, the mature Fesod coding sequence was fused to a chloroplast transit peptide from a pea ribulose-1,5-bisphosphate carboxylase gene. Expression of the chimeric gene was driven by the CaMV 35S promoter. Growth characteristics and in vitro oxidative stress tolerance of transgenic lines grown in control and chilling temperatures were evaluated. The transgenic line with the highest transgenic FeSOD activities had enhanced tolerance toward methyl viologen and had increased growth rates.
6 Both authors contributed equally to this work.
(Received May 21, 1998; Accepted March 5, 1999)
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