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Evaluation of transformation in peach Prunus persica explants using green fluorescent protein (GFP) and beta-glucuronidase (GUS) reporter genes

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Abstract

To determine the optimum conditions for Agrobacterium-mediated gene transfer, peach explants including cotyledons, embryonic axes and hypocotyl slices from non-germinated seeds and epicotyl internode slices from germinating seeds were exposed to Agrobacterium-mediated transformation treatments. The GUS (uidA) marker gene was tested using two different A. tumefaciens strains, three plasmids and four promoters [CaMV35s, (Aocs)3AmasPmas (“super-promoter”), mas-CaMV35s, and CAB]. GFP was tested with six A.␣tumefaciens strains, one plasmid (pLC101) and the doubleCaMV35s (dCaMV35s) promoter. The CaMV35s promoter produced more GUS expression than the CAB promoter. A. tumefaciens strains EHA105 and LBA4404 harboring the same plasmid (pBIN19) differed in their effects on GUS expression suggesting an interaction between A. tumefaciens strain and plasmid. A combination of A. tumefaciens EHA105, plasmid pBIN19 and the CaMV35s promoter produced the highest rates of transformation in peach epicotyl internodes (56.8%), cotyledons (52.7%), leaves (20%), and embryonic axes (46.7%) as evaluated by the percentage of explants expressing GUS 14 days after co-cultivation. GFP expression under the control of the dCaMV35s promoter was highest for internode explants but only reached levels of 18–19%. When GFP-containing plasmid pCL101 was combined with each of five A. tumefaciens strains the highest levels of transformation were 20–21% (internode and cotyledons, respectively). When nine peach genotypes were co-cultivated with A. tumefaciens strain EHA105 and GFP-containing plasmid pCL101 the highest levels of transformation were 26–28% (cotyledons and internodes, respectively). While GFP represents a potentially useful transformation marker that allows the non-destructive evaluation of transformation, rates of GFP transformation under the conditions of this study were low. It will be necessary to optimize expression of this marker gene in peach.

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Abbreviations

BA:

benzyladenine

CAB:

chlorophyll a/b binding protein promoter

CaMV35s:

cauliflower mosaic virus promoter

GUS:

beta-glucuronidase

LB:

Luria Broth base

NPTII:

neomycin phosphotransferase

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Acknowledgements

We thank Dr. Dennis Gray for providing the GPF constructs, Dr. Carole Bassett for providing the CAB promoter, Dr. Thomas Burr for providing the wild-type Agrobacterium tumefaciens strains, and Kevin Webb and Katie Tabb for technical assistance.

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Author notes

  1. Isabel M.G. Padilla

    Present address: Estación Experimental La Mayora, CSIC, Málaga, Spain

Authors and Affiliations

  1. USDA-ARS Appalachian Fruit Research Station, Kearneysville, WV, 25443, USA

    Isabel M.G. Padilla & Ralph Scorza

  2. Research Institute of Pomology and Floriculture, Skierniewice, Poland

    Agnieszka Golis

  3. ISF, Department of Propagation, Rome, Italy

    Adele Gentile & Carmine Damiano

Authors
  1. Isabel M.G. Padilla
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  2. Agnieszka Golis
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  3. Adele Gentile
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  4. Carmine Damiano
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  5. Ralph Scorza
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Correspondence to Ralph Scorza.

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Padilla, I.M., Golis, A., Gentile, A. et al. Evaluation of transformation in peach Prunus persica explants using green fluorescent protein (GFP) and beta-glucuronidase (GUS) reporter genes. Plant Cell Tiss Organ Cult 84, 309–314 (2006). https://doi.org/10.1007/s11240-005-9039-1

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