Abstract
Magainins, short peptides with broad-spectrum antimicrobial activity in vitro, were assayed for their ability to confer resistance to pathogens in transgenic grapevines. Embryogenic cell suspensions of ‘Chardonnay’ (Vitis vinifera L.) were co-transformed by microprojectile bombardment with a plasmid carrying the npt-II gene and a second plasmid harboring either a natural magainin-2 (mag2) or a synthetic derivative (MSI99) gene. Magainin genes and the marker gene were driven by Arabidopsis ubiquitin-3 and ubiquitin-11 promoters, respectively. A total of 10 mag2 and 9 MSI99 regenerated lines were studied by Southern blot hybridization, which showed 1–6 transgene integration events into the plant genome. Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) revealed a variable range in transcription levels among mag2 and MSI99 lines. A positive correlation between number of integration events and transcription level was observed (p<0.05). Plants were acclimated and challenged in the greenhouse with either Agrobacterium vitis strains (bacterial crown gall pathogen) at 108 cfu/ml or Uncinula necator (fungal powdery mildew pathogen) at 105 conidia/ml for evaluation of disease resistance. A total of 6 mag2 and 5 MSI99 lines expressing the antimicrobial genes exhibited significant reductions of crown gall symptoms as compared to non-transformed controls. However, only two mag2 lines showed measurable symptom reductions in response to U. necator, but not strong resistance. Our results suggest that the expression of magainin-type genes in grapevines may be more effective against bacteria than fungi. Additional strategies to enhance transgene expression and the spectrum of resistance to grape diseases are suggested.
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Abbreviations
- AMP:
-
antimicrobial peptide
- mag2 :
-
natural magainin-2 gene
- MSI99 :
-
synthetic analog of magainin-2 gene
- RT-PCR:
-
reverse transcription-polymerase chain reaction
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Vidal, J.R., Kikkert, J.R., Malnoy, M.A. et al. Evaluation of Transgenic ‘Chardonnay’ (Vitis vinifera) Containing Magainin Genes for Resistance to Crown Gall and Powdery Mildew. Transgenic Res 15, 69–82 (2006). https://doi.org/10.1007/s11248-005-4423-5
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DOI: https://doi.org/10.1007/s11248-005-4423-5