Abstract
The efficient production of marker-free transgenic plants is still a challenge in most fruit species even though such plants are a necessary component of many “new breeding technologies”, particularly cis- and intragenesis. Marker-free plant production is also necessary for the successive stacking of genes in an elite fruit transgenic line. Here, we used a R/Rs site-specific recombinase that is post-translationally regulated by dexamethasone through fusion with a ligand-binding domain for this hormone, and a bi-functional selectable marker gene coding for a cytosine deaminase/neomycin transferase (codA–nptII) protein; this enabled a first step of positive kanamycin selection, followed by a second step of negative 5-fluorocytosine selection. The aim of our study was to optimize this system on the apple cv. Galaxy and on the pear cv. Conference by conducting a detailed study of the effects of dexamethasone and 5-fluorocytosine treatments, and by comparing an early versus a delayed selection strategy. We were able to produce marker-free transgenic pear plants for the first time, and confirm the feasibility of producing marker-free transgenic apple plants using a chemically inducible recombinase system. We recommend the use of an early selection strategy for the pear cv. Conference and a delayed selection strategy for the apple cv. Galaxy.
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References
Ballester A, Cervera M, Pena L (2007) Efficient production of transgenic Citrus plants using isopentenyl transferase positive selection and removal of the marker gene by site-specific recombination. Plant Cell Rep 26:39–45
Brown SC, Bergounioux C, Tallet S, Marie D (1991) Flow cytometry of nuclei for ploidy and cell cycle analysis. In: Negrutiu I, Gharti-Chetri GB (eds) Biomethods, a laboratory guide for cellular and molecular plant biology, vol 4. Birkhaeuser Verlag, Basel, pp 326–345
Chevreau E, Dupuis F, Taglioni JP, Sourice S, Cournol R, Deswartes C, Bersegeay A, Descombin J, Siegwart M, Loridon K (2011) Effect of ectopic expression of the eutypine detoxifying gene Vr-ERE in transgenic apple plants. Plant Cell Tissue Organ Cult 106:161–168
Degenhardt J, Poppe A, Montag J, Szankowski I (2006) The use of the phosphor-isomerase/mannose selection system to recover transgenic apple plants. Plant Cell Rep 25:1149–1156
Erikson O, Hertzberg M, Näsholm T (2004) A conditional marker gene allowing both positive and negative selection in plants. Nat Biotechnol 22:455–458
European Food Safety Authority (2012) Scientific opinion addressing the safety assessment of plants developed through cisgenesis and intragenesis. EFSA J 10:2561–2594
Fitch MMM, Manshardt RM, Gonsalves D, Slightom JL, Sanford JC (1992) Virus resistant papaya plants derived from tissues bombarded with the coat protein gene of papaya ringspot virus. Nat Biotechnol 10:1466–1472
Gambino G, Gribaudo I (2012) Genetic transformation of fruit trees: current status and remaining challenges. Transgenic Res 21:1163–1181
Grindley ND, Whiteson KL, Rice PA (2006) Mechanisms of site specific recombination. Ann Rev Biochem 75:567–605
Halpin C (2005) Gene stacking in transgenic plants—the challenge for 21st century plant biotechnology. Plant Biotechnol J 3:141–155
Hättasch C, Flachowsky H, Hanke MV (2009) Evaluation of an alternative D-amino acid/DAOO selection system for transformation in apple (Malus x domestica Borkh.). J Hortic Sci Biotech, ISAFRUIT Special Issue 188–194
Herzog K, Flachowsky H, Deising HB, Hanke MV (2012) Heat-shock-mediated elimination of the nptII marker gene in transgenic apple (Malus x domestica Borkh.). Gene 498:41–49
Jefferson RA, Kavanagh TA, Bevan MW (1987) Gus gene fusions: b-glucuronidase as a sensitive and versatile gene fusion marker in higher plants. EMBO J 6:3901–3907
Khan RS, Nakamura I, Mii M (2011) Development of disease-resistant marker-free tomato by R/RS site-specific recombination. Plant Cell Rep 30:1041–4053
Kondrak M, van der Meer IM, Banfalvi Z (2006) Generation of marker- and backbone-free transgenic potatoes by site-specific recombination and a bi-functional marker gene in a non-regular one-border Agrobacterium transformation vector. Transgenic Res 15:729–737
Kortstee AJ, Khan SA, Helderman C, Trindade LM, Wu Y, Visser RGF, Brendolise C, Allan A, Schouten HJ, Jacobsen E (2011) Anthocyanin production as a potential visual selection marker during plant transformation. Transgenic Res 20:1253–1264
Leblay C, Chevreau E, Raboin LM (1991) Adventitious shoot regeneration from in vitro leaves of several pear cultivars (Pyrus communis L.). Plant Cell Rep 25:99–105
Logie C, Stewart AF (1995) Ligand-regulated site-specific recombination. Proc Natl Acad Sci USA 12:5940–5944
Malnoy MA, Korban S, Boresjza-Wysocka EE, Aldwinckle HS (2008) Apple. In: Kole C, Hall TC (eds) Transgenic temperate fruits and nuts. Wiley-Blackwell, New York, pp 1–29
Malnoy M, Boresjza-Wysocka EE, Norelli JL, Flaishmann MA, Gidoni D, Aldwinckle HS (2010) Genetic transformation of apple (Malus x domestica) without use of a selectable marker gene. Tree Genet Genomes 6:423–433
Matsuzaki H, Araki H, Oshima Y (1988) Gene conversion associated with site-specific recombination in yeast plasmid pSR1. Mol Cell Biol 8:955–962
Mourgues F, Chevreau E, Lambert C, de Bondt A (1996) Efficient Agrobacterium-transformation and recovery of transgenic plants from pear (Pyrus communis L.). Plant Cell Rep 16:245–249
Murashige T, Skoog F (1962) A revised medium for rapid growth and bioassays with tobacco tissue culture. Physiol Plant 15:473–497
Perera RJ, Linard CG, Signer ER (1993) Cytosine deaminase as a negative selection marker for Arabidopsis. Plant Mol Biol 23:793–799
R Core Team (2012) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0, http://www.R-project.org/
Schaart JG, Krens FA, Pelgrom KTB, Mendes O, Rouwendal GJA (2004) Effective production of selectable marker-free transgenic strawberry plants using inducible site-specific recombination and a bifunctional selectable marker gene. Plant Biotechnol J 2:233–240
Schaart JG, Krens FA, Wolters A-MA, Visser RGF (2010) Chapter 15: transformation methods for obtaining marker-free genetically modified plants. In: Stewart CN, Touraev A Jr, Citovsky V, Tzfira T (eds) Plant transformation technologies. Wiley-Blackwell, New York, pp 229–242
Schouten HJ, Krens FA, Jacobsen E (2006) Cisgenic plants are similar to traditionally bred plants. EMBO Rep 7:750–753
Scorza R, Callahan A, Dardick C, Ravelonandro M, Polak J, Malinowski T, Zagrai I, Cambra M, Kamenova I (2013) Genetic engineering of Plum pox virus resistance: ‘HoneySweet’ plum—from concept to product. Plant Cell Tissue Organ Cult 115:1–12
Sugita A, Kashara T, Matsunaga E, Ebinuma H (2000) A transformation vector for the production of marker-free plants containing a single copy transgene at high frequency. Plant J 22:461–469
Szankowski I, Bribiva K, Flescchut J, Schönherr J, Jacobsen HJ, Kiesecker H (2003) Transformation of apple (Malus domestica Borkh.) with the stilbene synthase gene from grapevine (Vitis vinifera L.) and a PGIP gene from kiwi (Actinidia deliciosa). Plant Cell Rep 22:141–149
Thyagarajan B, Guimaraes MJ, Groth AC, Calos MP (2000) Mammalian genomes contain active recombinase recognition sites. Gene 244:47–54
Van der Fits L, Deakin EA, Hoge JH, Memelink J (2000) The ternary transformation system: constitutive virG on a compatible plasmid dramatically increases Agrobacterium-mediated plant transformation. Plant Mol Biol 43:495–502
Vanblaere T, Szankowski I, Schaart J, Schouten H, Flachowsky H, Broggini GAL, Gessler C (2011) The development of a cisgenic apple plant. J Biotechnol 154:304–311
Velasco R, Zharkikh A, Affourtit J, Dhingra A, Cestaro A, Kalyanaraman A, Fontana P et al (2010) The genome of the domesticated apple (Malus x domestica Borkh.). Nat Genet 42:833–839
Wang Y, Yau YY, Perkins-Balding D, Thomson JG (2011) Recombinase technology: applications and possibilities. Plant Cell Rep 30:267–285
Acknowledgments
This project was funded by the ISAFRUIT EU Project (6th PCRD) and post-doctoral grants from Region Pays de la Loire and Angers Agglomération. In addition, this work was supported by the Grant ANR-11-BTBR-0006-GENIUS. The plasmid pRCNG was kindly provided by Dr. Schaart (PRI, Wageningen). The authors gratefully acknowledge the INEM team and particularly J. M. Boré, N. Dousset and L. Leclout for excellent technical assistance in the greenhouses, and B. Billy (SNES-GEVES) for technical assistance in flow cytometry. Technical contributions from J. G. Bertault, C. Cesbron, T. Clochard, F. Dupuis, F. Simoneau and S. Sourice are also gratefully acknowledged.
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Righetti, L., Djennane, S., Berthelot, P. et al. Elimination of the nptII marker gene in transgenic apple and pear with a chemically inducible R/Rs recombinase. Plant Cell Tiss Organ Cult 117, 335–348 (2014). https://doi.org/10.1007/s11240-014-0443-2
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DOI: https://doi.org/10.1007/s11240-014-0443-2