Abstract
A selection system based on the phosphomannose-isomerase gene (pmi) as a selectable marker and mannose as the selective agent was evaluated for the transformation of apple (Malus domestica Borkh.). Mannose is an unusable carbon source for many plant species. After uptake, mannose is phosphorylated by endogenous hexokinases to mannose-6-phosphate. The accumulation of mannose-6-phosphate leads to a block in glycolysis by inhibition of phosphoglucose-isomerase, resulting in severe growth inhibition. The phosphomannose-isomerase is encoded by the manA gene from Escherichia coli and catalyzes the conversion of mannose-6-phosphate to fructose-6-phosphate, an intermediate of glycolysis. Transformed cells expressing the manA gene can therefore utilize mannose as a carbon and survive on media containing mannose. The manA gene along with a β-glucuronidase (GUS) gene was transferred into apple cv. ‘Holsteiner Cox’ via Agrobacterium tumefaciens-mediated transformation. Leaf explants were selected on medium supplemented with different concentrations and combinations of mannose and sorbitol to establish an optimized mannose selection protocol. Transgenic lines were regenerated after an initial selection pressure of 1–2 g l−1 mannose in combination with 30 g l−1 sorbitol followed by a stepwise increase in the mannose concentration up to 10 g l−1 and simultaneous decrease in the sorbitol concentration. Integration of transgenes in the apple genome of selected plants was confirmed by PCR and southern blot analysis. GUS histochemical and chlorophenol red (CPR) assays confirmed activity of both transgenes in regenerated plants. The pmi/mannose selection system is shown to be highly efficient for producing transgenic apple plants without using antibiotics or herbicides.
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Abbreviations
- BAP:
-
6-Benzylaminopurine
- CaMV:
-
Cauliflower mosaic virus
- CMPS:
-
Cestrium yellow leaf curling virus promoter shorter version
- GUS:
-
β-Glucuronidase
- IBA:
-
Indole-3-butyric acid
- Man:
-
Mannose
- MS:
-
Murashige and Skoog
- pmi :
-
Phosphomannose-isomerase
- Sor:
-
Sorbitol
- Suc:
-
Sucrose
- TDZ:
-
Thidiazuron
- YEP:
-
Yeast extract broth
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Acknowledgements
The authors would like to thank Syngenta, Switzerland, for providing the plasmid pNOV2819 and Dr. Michael Wallbraun, Centrum Grüne Gentechnik, Germany, for introducing the GUS gene into pNOV2819. The work was supported by CAPES, Brazil, by a scholarship to Juliana Degenhardt and Stiftung Gisela.
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Degenhardt, J., Poppe, A., Montag, J. et al. The use of the phosphomannose-isomerase/mannose selection system to recover transgenic apple plants. Plant Cell Rep 25, 1149–1156 (2006). https://doi.org/10.1007/s00299-006-0179-5
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DOI: https://doi.org/10.1007/s00299-006-0179-5