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Construction of a new vector conferring methotrexate resistance in Nicotiana tabacum plants

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Abstract

A new binary vector encoding for Candida albicans dihydrofolate reductase (DFR1) has been constructed and used as a dominant selectable marker for plant transformation. Transgenic tobacco plants with an increased resistance to methotrexate (Mtx) were obtained by co-transformation of tobacco leaf discs with Agrobacterium tumefaciens strains carrying two new binary vectors: pTI20 and pTI18. Co-transformants of Nicotiana tabacum were directly selected for and rooted on medium containing both kanamycin (kan) and Mtx. Leaf discs of transgenic plants were assayed for capacity of regeneration at different Mtx concentrations. Analysis of transcripts was performed on total RNA extracted from two Mtx-resistant plants. The transgenic plants increased resistance to Mtx can be explained by the exceptionally low capacity of Mtx to bind C. albicans dihydrofolate reductase, accountable by the presence of two amino acid residues strategically important in Mtx binding.

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Authors and Affiliations

  1. Istituto Sperimentale per la Zoologia Agraria, Ministero delle Politiche Agricole, Cascine del Riccio, 50125, Florence, Italy

    Tiziana Irdani

  2. Department of Animal Biology and Genetics ‘Leo Pardi’, University of Florence, 50125, Florence, Italy

    Patrizia Bogani, Alessio Mengoni, Giorgio Mastromei & Marcello Buiatti

Authors
  1. Tiziana Irdani
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  2. Patrizia Bogani
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  3. Alessio Mengoni
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  4. Giorgio Mastromei
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  5. Marcello Buiatti
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Irdani, T., Bogani, P., Mengoni, A. et al. Construction of a new vector conferring methotrexate resistance in Nicotiana tabacum plants. Plant Mol Biol 37, 1079–1084 (1998). https://doi.org/10.1023/A:1006082815434

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  • DOI: https://doi.org/10.1023/A:1006082815434

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