Abstract
The use of minimal gene cassettes (MCs), which are linear DNA fragments (promoter+open reading frame+terminator) lacking the vector backbone sequence, was compared to the traditional use of whole circular plasmids (CPs) for transformation of grapevine. Embryogenic cell suspensions of ‘Chardonnay’ (Vitis vinifera L.) were transformed via particle co-bombardment using two nonlinked genes in either MCs or CPs. One construct contained the npt-II selectable marker and the second construct contained the MSI99 antimicrobial peptide gene. A total of five lines each from MC and CP treatments that showed positive signals by PCR for both the npt-II and MSI99 genes were selected. Southern blot analyses revealed up to five integration events in the DNA treatments. Transcription levels determined by semi-quantitative RT-PCR varied among transgenic lines. No significant differences were found in transgene transcription between lines from MC and CP transformation. The correlation between npt-II and MSI99 transcription levels was positive (P<0.05), however, no correlation between the transcription level and the number of integration events was observed. Transgenic lines presented a similar phenotype in leaf morphology and plant vigor compared to non-transgenic lines. Moreover, transgenic lines from both MC and CP DNA treatments produced fruit as did the non-transgenic lines in the third year of growth in the greenhouse. Our data confirm the effectiveness of the minimal cassette technology for genetic transformation of grapevine cultivars.
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Abbreviations
- CP(s):
-
circular plasmid(s)
- MC(s):
-
minimal cassette(s)
- MSI99 :
-
synthetic analog of magainin-2 gene
- RT-PCR:
-
reverse transcription-polymerase chain reaction
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Acknowledgments
The authors thank Dr. Herb Aldwinckle (Cornell University) for critically reviewing this manuscript and helpful discussions. We are grateful to Dr. John Sanford (FMS Foundation) and Dr. Franzine Smith (Sanford Scientific Inc.) for providing pSAN plasmids, Dr. John Barnard for supervising statistical analysis, and Steve Luce for excellent technical assistance. This research was supported by grants from the American Vineyard Foundation, the USDA Viticulture Consortium-East, and the New York Wine and Grape Foundation. J.R. Vidal was supported in part by Kaplan Funds and a postdoctoral grant from the Spanish Ministry of Education and Science.
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Vidal, J.R., Kikkert, J.R., Donzelli, B.D. et al. Biolistic transformation of grapevine using minimal gene cassette technology. Plant Cell Rep 25, 807–814 (2006). https://doi.org/10.1007/s00299-006-0132-7
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DOI: https://doi.org/10.1007/s00299-006-0132-7