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Genetic transformation of strawberry by Agrobacterium tumefaciens using a leaf disk regeneration system

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Abstract

An efficient genetic transformation protocol has been developed for strawberry cv. Redcoat using Agrobacterium tumefadens. The protocol relies on a high frequency (84%) shoot regeneration system from leaf disks. The leaf disks were inoculated with a non-oncogenic Agrobacterium tumefadens strain MP90 carrying a binary vector plasmid pBI121 which contains a chimeric nopaline synthase (NOS) promoter driven neomycin phosphotransferase (NPT II) gene and a cauliflower mosaic virus 35S (CaMV35S) promoter driven, ß-glucuronidase (GUS) marker gene. The inoculated leaf disks, pre-cultured for 10 days on non-selective shoot regeneration medium, formed light green meristematic regions on selection medium containing 50 μg/ml kanamycin. These meristematic regions developed into transformed shoots at a frequency of 6.5% on a second selection medium containing 25 μg/ml kanamycin. The selected shoots were multiplied on shoot proliferation medium in the presence of kanamycin. All such shoots were resistant to kanamycin and expressed varying levels of NPT II and GUS enzyme activity. Histochemical assays for GUS activity indicated that the 35S promoter was highly active in meristematic cells of shoot and root apices. Molecular analysis of each transgenic clone confirmed the integration of both marker genes into the strawberry genome. Leaf disks prepared from transformed plants, when put through the second selection cycle on kanamycin, formed callus and exhibited GUS activity. The rooted transformed plants were grown in a greenhouse for further characterization. The protocol may be useful for improvement of strawberry through gene manipulations.

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Author notes

  1. Cecil Stushnoff

    Present address: Department of Biochemistry, Colorado State University, 80523, Fort Collins, CO, USA

Authors and Affiliations

  1. Department of Horticulture Science, University of Saskatchewan, S7N 0W0, Saskatoon, Saskatchewan, Canada

    Narender S. Nehra & Cecil Stushnoff

  2. Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Road, S7N 0W9, Saskatoon, Saskatchewan, Canada

    Ravindra N. Chibbar, Kutty K. Kartha, Raju S. S. Datla & William L. Crosby

Authors
  1. Narender S. Nehra
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  2. Ravindra N. Chibbar
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  3. Kutty K. Kartha
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  4. Raju S. S. Datla
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  5. William L. Crosby
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  6. Cecil Stushnoff
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Additional information

Communicated by F. Constabel

NRCC No. 31491

During the editorial process, a report has appeared on transformation of strawberry (James et al. 1990 Plant Sci 69:79–94).

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Nehra, N.S., Chibbar, R.N., Kartha, K.K. et al. Genetic transformation of strawberry by Agrobacterium tumefaciens using a leaf disk regeneration system. Plant Cell Reports 9, 293–298 (1990). https://doi.org/10.1007/BF00232854

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  • DOI: https://doi.org/10.1007/BF00232854

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