Abstract
A new method for obtaining transgenic sweet orange plants was developed in which positive selection (Positech) based on the Escherichia coli phosphomannose-isomerase (PMI) gene as the selectable marker gene and mannose as the selective agent was used. Epicotyl segments from in vitro-germinated plants of Valencia, Hamlin, Natal and Pera sweet oranges were inoculated with Agrobacterium tumefaciens EHA101-pNOV2116 and subsequently selected on medium supplemented with different concentrations of mannose or with a combination of mannose and sucrose as a carbon source. Genetic transformation was confirmed by PCR and Southern blot. The transgene expression was evaluated using a chlorophenol red assay and isoenzymes. The transformation efficiency rate ranged from 3% to 23.8%, depending on cultivar. This system provides an efficient manner for selecting transgenic sweet orange plants without using antibiotics or herbicides.
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Abbreviations
- BAP :
-
Benzylaminopurine
- CPR :
-
Chlorophenol red
- EGTA :
-
Ethylene glycol-0-0′- bis (2, aminoethyl) N′, N′, N′, N′ tetraacetic acid
- MTT :
-
[3-(4,5-Dimethyl thiazol-2-YL)-2,5-diphenyl] tetrazolium bromide
- PMI :
-
Phosphomannose isomerase (EC 5.3.1.8)
- PMS :
-
Phenazine methosulphate
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Acknowledgements
The authors acknowledge receiving financial support for this research from FAPESP (99/04073-3) and FUNDECITRUS. RLB and WABA both acknowledge FAPESP and CAPES/PICDT for receipt of a scholarship. BMJM and FAAMF acknowledge CNPq for research fellowships. The authors wish to thank Adriana P.M. Rodriguez for critical comments, Myriam R. Orsi for technical assistance and Syngenta for supplying pNOV2116.
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Boscariol, R.L., Almeida, W.A.B., Derbyshire, M.T.V.C. et al. The use of the PMI/mannose selection system to recover transgenic sweet orange plants (Citrus sinensis L. Osbeck). Plant Cell Rep 22, 122–128 (2003). https://doi.org/10.1007/s00299-003-0654-1
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DOI: https://doi.org/10.1007/s00299-003-0654-1