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Tissue-specific expression of the rolA gene mediates morphological changes in transgenic tobacco

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Abstract

The spatial and temporal activity of the entire and individual promoter domains of the rolA gene of Agrobacterium rhizogenes was investigated and correlated with the distinctive features of the phenotypes of transgenic tobacco plants. The GUS assay was performed in the presence of an oxidative catalyst during the development of transgenic plants expressing chimeric genes containing the β-glucuronidase coding sequence under the control of the different promoter domains. In situ hybridization was also used on transgenic plants harbouring rolA under the control of the entire or deleted promoter. This paper demonstrates for the first time that the entire rolA promoter, composed of domains, A, B and C, is silent in seeds, then activated at the onset of germination in the cotyledons and in the elengation zone of the radicle and is finally expressed throughout the vegetative and floral phases. Domains B+C, which were sufficient to induce wrinkled leaves and short internodes, were active in all the stem tissues, but only in the companion cells of the phloem strands of the leaves. Domain C, which specified a dwarf phenotype with normal leaves, was weakly expressed in the stem vascular bundles and in the leaf internal phloem. These results indicate that the vascular bundles are the primary targets for the generation of the short internode phenotype. Furthermore, the local expression of rolA in the stem vascular bundles induced a size reduction of the surrounding parenchyma cells, suggesting the existence of some diffusible factor(s) associated with the expression of the rolA gene.

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Authors and Affiliations

  1. Laboratoire CEMV, Bât. N2, Université Pierre et Marie Curie, 4 place Jussieu, F-75252, Paris Cedex 05, France

    Anne Guivarc'h & Dominique Chriqui

  2. National Center for Genetic Resources and Biotechnology, EMBRAPA/CENARGEN, SAIN Parque Rural, 70086-900, Brasilia DF, Brazil

    Mauro Carneiro

  3. Laboratoire de Biologie Cellulaire, INRA-Versailles, F-78026, Versailles Cedex, France

    Françoise Vilaine & Véronique Pautot

Authors
  1. Anne Guivarc'h
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  2. Mauro Carneiro
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  3. Françoise Vilaine
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  4. Véronique Pautot
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  5. Dominique Chriqui
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Guivarc'h, A., Carneiro, M., Vilaine, F. et al. Tissue-specific expression of the rolA gene mediates morphological changes in transgenic tobacco. Plant Mol Biol 30, 125–134 (1996). https://doi.org/10.1007/BF00017807

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  • DOI: https://doi.org/10.1007/BF00017807

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