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Use of bar as a selectable marker gene and for the production of herbicide-resistant rice plants from protoplasts

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Abstract

We have used the bar gene in combination with the herbicide Basta to select transformed rice (Oryza sativa L. cv. Radon) protoplasts for the production of herbicide-resistant rice plants. Protoplasts, obtained from regenerable suspension cultures established from immature embryo callus, were transformed using PEG-mediated DNA uptake. Transformed calli could be selected 2–4 weeks after placing the protoplast-derived calli on medium containing the selective agent, phosphinothricin (PPT), the active component of Basta. Calli resistant to PPT were capable of regenerating plants. Phosphinothricin acetyltransferase (PAT) assays confirmed the expression of the bar gene in plants obtained from PPT-resistant calli. The only exceptions were two plants obtained from the same callus that had multiple copies of the bar gene integrated into their genomes. The transgenic status of the plants was varified by Southern blot analysis. In our system, where the transformation was done via the protoplast method, there were very few escapes. The efficiency of co-transformation with a reporter gene gusA, was 30%. The To plants of Radon were self-fertile. Both the bar and gusA genes were transmitted to progeny as confirmed by Southern analysis. Both genes were expressed in T1 and T2 progenies. Enzyme analyses on T1 progeny plants also showed a gene dose response reflecting their homozygous and heterozygous status. The leaves of To plants and that of the progeny having the bar gene were resistant to application of Basta. Thus, the bar gene has proven to be a useful selectable and screenable marker for the transformation of rice plants and for the production of herbicide-resistant plants.

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Authors and Affiliations

  1. Department of Botany and Plant Pathology, Purdue University, 47907, IN, West Lafayette, USA

    Keerti S. Rathore & Thomas K. Hodges

  2. Plant Tissue Culture Section, Department of Genetics, Haryana Agricultural University, 125004, Hisar, India

    Vijay K. Chowdhury

Authors
  1. Keerti S. Rathore
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  2. Vijay K. Chowdhury
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  3. Thomas K. Hodges
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Rathore, K.S., Chowdhury, V.K. & Hodges, T.K. Use of bar as a selectable marker gene and for the production of herbicide-resistant rice plants from protoplasts. Plant Mol Biol 21, 871–884 (1993). https://doi.org/10.1007/BF00027118

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  • DOI: https://doi.org/10.1007/BF00027118

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