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The tomato gene for the chloroplastic Cu,Zn superoxide dismutase: regulation of expression imposed in transgenic tobacco plants by a short promoter

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Abstract

The chloroplastic Cu,Zn superoxide dismutase (SOD) has an important role in the defense against damage by oxygen radicals in the chloroplasts. Here, for the first time, we report on the isolation of a genomic DNA clone from tomato that contains all the coding sequence for the chloroplastic Cu,Zn SOD as well as a 442 bp DNA fragment upstream of the translational initiation site. The latter upstream sequence has a putative TATA box and a 285 bp promoter region, 5′ of the apparent transcriptional initiation and a 157 bp leader region. The coding sequence is composed of 8 exons that are interspaced by 7 introns; we termed this geneSODCp;Le:1. The 442 bp fragment was cloned into a pBI101 vector, upstream of theuidA (GUS) gene, via transcriptional fusion.Agrobacterium-mediated transformation resulted in transgenic tobacco plants.

The progeny (after self-pollination) of 14 transformed plants, which expressed GUS above a threshold of 1 nmol/min per mg protein, were found to fall into two distinct groups. In the seedlings of 10 lines (group A) GUS expression was enhanced by exposure to light. In 4 lines of this group maintenance for 3 days in the dark eliminated GUS activity. The seedlings of group B expressed GUS regardless of the light/dark regime. In plants of group A, GUS expression was also developmentally regulated: high GUS activity in young leaves, low activity in mature leaves and no activity in the roots. The results suggest that this short chloroplastic Cu,Zn SOD promoter contains motifs for developmental (spatial) regulation as well as motifs responsive to light (or to oxygen radicals resulting from light-driven photosynthesis).

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Authors and Affiliations

  1. Department of Plant Genetics, The Weizmann Institute of Science, 76100, Rehovot, Israel

    N. Kardish, D. Aviv & E. Galun

  2. Molecular Genetics Laboratory, Beilinson Hospital, Petach Tikva, Israel

    N. Magal

Authors
  1. N. Kardish
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  2. N. Magal
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  3. D. Aviv
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  4. E. Galun
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Kardish, N., Magal, N., Aviv, D. et al. The tomato gene for the chloroplastic Cu,Zn superoxide dismutase: regulation of expression imposed in transgenic tobacco plants by a short promoter. Plant Mol Biol 25, 887–897 (1994). https://doi.org/10.1007/BF00028883

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  • DOI: https://doi.org/10.1007/BF00028883

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