Abstract
A collection of 127 putatively transgenic individuals of Vitis vinifera cv. Russalka was characterized by PCR and Southern hybridization. Six different constructs containing the neomycin phosphotransferase (nptII) marker gene and sequences of the Grapevine Fanleaf Virus Coat Protein (GFLV CP) gene including non-translatable and truncated forms were transferred via Agrobacterium-mediated transformation. Detection of transgenic sequences by PCR was positive in all lines. Southern blot analysis revealed that the number of inserted T-DNA copies ranged from 1 to 6. More than 46% of the tested transgenic lines contain one copy of the inserted T-DNA, qualifying them as interesting candidates for further breeding programs. Southern data of one line indicate the presence of an incomplete copy of the T-DNA, thus confirming previous PCR results. Since many putative transgenic lines shared identical hybridization patterns, they were clustered into 39 lines and considered as having originated from independent transformation events. The detection of the tetracycline (TET) resistance genes in 15% of the lines shows that an integration of plasmid backbone sequences beyond the T-DNA borders occurred. Enzyme-linked immunosorbent assay (ELISA) performed on leaf tissue did not show any accumulation of the GFLV CP in the 39 transgenic lines analyzed. Reverse transcription polymerase chain reaction (RT-PCR) and Northern blot were carried out; RT-PCR analyses showed that the GFLV CP mRNA was expressed at variable levels.
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The authors express their gratitude to Richard Gölles; and John Hammond for primers JH006 and JH020. The financial support by the BMLFUW is acknowledged.
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Maghuly, F., Leopold, S., da Câmara Machado, A. et al. Molecular characterization of grapevine plants transformed with GFLV resistance genes: II. Plant Cell Rep 25, 546–553 (2006). https://doi.org/10.1007/s00299-005-0087-0
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DOI: https://doi.org/10.1007/s00299-005-0087-0