Abstract.
Many systems have been developed for the removal of a selection marker in order to generate marker-free transgenic plants. These systems consist of (1) a site-specific recombination system (Cre/lox) or a phage-attachment region (attP) to remove the selectable marker gene and (2) a transposable element system (Ac) or a co-transformation system to segregate the gene of interest from the selectable marker gene. Overall, the process is more time-consuming than conventional transformation methods because two rounds of transformation – two steps of regeneration or sexual crossings – are required to obtain the desired transgenic plants. Recently, removal systems combined with a positive marker, denoted as MAT vectors, have been developed to save time and effort by generating marker-free transgenic plants through a single-step transformation. We summarize here the transformation procedures using these systems and discuss their feasibility for practical use.
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Revision received: 10 March 2001
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Ebinuma, H., Sugita, K., Matsunaga, E. et al. Systems for the removal of a selection marker and their combination with a positive marker. Plant Cell Rep 20, 383–392 (2001). https://doi.org/10.1007/s002990100344
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DOI: https://doi.org/10.1007/s002990100344