Abstract
The selectable marker cyanamide hydratase/cyanamide was successfully used to generate transgenic potato plants from the cultivars Russet Burbank, Ranger Russet, Bintje, Desiree, Kardal and Pentland Dell. Up to 3,000 transgenics per person per year were produced. The efficiency of transgenic production varied among cultivars, and was in general 2–3 times lower than the transformation efficiency (TE) using the selectable marker kanamycin. Differences between cultivars in sensitivity to cyanamide selection were observed, but in general a concentration of 30 mg/l was applied for selection of transgenic shoots. A stepwise increase of cyanamide concentration during the transformation procedure for Russet Burbank resulted in an improved TE via a reduction of the escape efficiency from 69 to 29 %. The cultivars differed in the hormone concentration and duration (2,4-D and Zeatin riboside) required for the production of transgenics, predominantly during the phase of shoot initiation. Only for cultivars Bintje and Pentland Dell, adaptations in the hormone scheme are required during the transformation procedure with cyanamide selection compared to selection on kanamycin. Upon application of a transformation protocol for Russet Burbank, only in 1 % of the plants (in a population of 241) Agrobacterium could be detected, but these bacteria did not contain the vector for transgene transfer anymore.
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Abbreviations
- TE:
-
Transformation efficiency
- EE:
-
Escape efficiency
- D:
-
2,4-Dichlorophenoxy acetic acid
- Z:
-
Zeatin riboside
- G:
-
Gibberilic acid
- I:
-
Indolacetic acid
- IBA:
-
Indolbutyric acid
- NAA:
-
Naphtylacetic acid
- BAP:
-
Benzylaminopurin
- GA:
-
Gibberillic acid
- OD600 :
-
Optical density at 600 nm
- GUS:
-
Beta-glucuronidase
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Acknowledgments
D. Ingham for the Taqman analysis, D. Palmer for the field evaluation, S. Tito for the PCR analysis, H. Mudjiwarti and A. Kramer for technical support. Furthermore, it should be mentioned that the work presented was done at Syngenta Mogen, which has been disbanded in the year 2002; this manuscript is an homage to all these people involved and especially our colleague Stephan Ohl, who deceased far too early.
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Stephan Ohl: Deceased.
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van Driel, H., Keppel, M., van den Berg, E. et al. Cyanamide hydratase as selectable marker in potato. Plant Cell Tiss Organ Cult 118, 125–135 (2014). https://doi.org/10.1007/s11240-014-0468-6
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DOI: https://doi.org/10.1007/s11240-014-0468-6