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Genetic transformation of strawberry: Stable integration of a gene to control biosynthesis of ethylene

  • Genetic Transformation/Somatic Cell Genetics
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Summary

Efficient methods ofAgrobacterium-mediated transformation are described for two Pacific Northwest cultivars of strawberry (Fragaria ×ananassa), Tristar and Totem. We report stable incorporation of a gene for control of ethylene biosynthesis, into strawberry (cultivar Totem) for the first time. Cultivar Tristar was transformed with disarmed strains ofAgrobacterium tumefaciens (A. tumefaciens), LBA4404 or EHA101, containing a binary vector with marker genesuidA andnptII. Cultivar Totem was transformed withA. tumefaciens strains EHA101 or EHA105 harboring binary vectors with selectable marker genesnptII orhpt and with a gene for S-adenosylmethionine hydrolase (SAMase) for control of ethylene biosynthesis. The frequency of transgenic shoots ranged from 12.5% to 58.8% of the original treated explants when using plasmids containing the gene encoding SAMase. Primary shoot regenerants obtained on selection medium were subjected to several iterations of tissue isolation and reculture on higher stringency selection medium for recovering uniformly transformed plantlets. Transgenic plants were confirmed by their ability to undergo rooting on medium with selection at 60 mg/liter kanamycin or 10 mg/liter hygromycin. About 95–100% of the transformation events from different experiments were capable of profuse rooting in the presence of selection. Insertion of the SAMase gene and its integration into the strawberry genome were confirmed by Southern hybridization. About 500 plants from 250 independent transgenic events have been successfully transferred to soil for further evaluation.

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Authors and Affiliations

  1. Agritope Inc., 8505 S.W. Creekside Place, 97008, Beaverton, Oregon

    Helena Mathews, W. Wagoner, J. Kellogg & R. Bestwick

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  1. Helena Mathews
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  2. W. Wagoner
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  3. J. Kellogg
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  4. R. Bestwick
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Mathews, H., Wagoner, W., Kellogg, J. et al. Genetic transformation of strawberry: Stable integration of a gene to control biosynthesis of ethylene. In Vitro Cell Dev Biol - Plant 31, 36–43 (1995). https://doi.org/10.1007/BF02632224

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  • DOI: https://doi.org/10.1007/BF02632224

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