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Wounding by bombardment yields highly efficient Agrobacterium-mediated transformation of carnation (Dianthus caryophyllus L.)

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Abstract

Highly efficient Agrobacterium-mediated transformation of carnation (Dianthus caryophyllus L.) was obtained by first wounding stem explants via microprojectile bombardment. When this was followed by cocultivation with disarmed Agrobacterium in the dark, the transformation frequency-based on transient GUS expression-increased to over 10-fold that of explants wounded by other means and cocultivated under constant light. Two cycles of regeneration/selection on kanamycin were employed to generate stably transformed carnation plants and eliminate chimeras: first, plantlets were regenerated from inoculated stem explants and then leaves from these plantlets were used to generate transgenes in a second selection cycle of adventitious shoot regeneration. Agrobacterium strain AGLO, carrying the binary vector pCGN7001 containing uidA and nptII genes, was used in the stable transformation experiments. The combination of wounding via bombardment, cocultivation in the dark and two cycles of kanamycin selection yielded an overall transformation efficiency of 1–2 transgenes per 10 stem explants for the three carnation varieties analyzed. Histochemical and molecular analyses of marker genes in T0 and T1 generations confirmed the transgenic nature of the selected plants.

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Authors and Affiliations

  1. Kennedy-Leigh Centre for Horticultural Research and Otto Warburg Center for Biotechnology in Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot, 76-100, Israel

    Amir Zuker, Asaph Ahroni, Tzvi Tzfira, Hagit Ben-Meir & Alexander Vainstein

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  1. Amir Zuker
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  2. Asaph Ahroni
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  3. Tzvi Tzfira
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  4. Hagit Ben-Meir
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  5. Alexander Vainstein
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Zuker, A., Ahroni, A., Tzfira, T. et al. Wounding by bombardment yields highly efficient Agrobacterium-mediated transformation of carnation (Dianthus caryophyllus L.). Molecular Breeding 5, 367–375 (1999). https://doi.org/10.1023/A:1009671131200

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