Ontology type: schema:ScholarlyArticle
2003-03-10
AUTHORSNick de Vetten, Anne-Marie Wolters, Krit Raemakers, Ingrid van der Meer, Renaldo ter Stege, Els Heeres, Paul Heeres, Richard Visser
ABSTRACTIt is generally thought that transformation of plant cells using Agrobacterium tumefaciens occurs at a very low frequency. Therefore, selection marker genes are used to identify the rare plants that have taken up foreign DNA. Genes encoding antibiotic and herbicide resistance are widely used for this purpose in plant transformation1,2. Over the past several years, consumer and environmental groups have expressed concern about the use of antibiotic- and herbicide-resistance genes from an ecological and food safety perspective. Although no scientific basis has been determined for these concerns, generating marker-free plants would certainly contribute to the public acceptance of transgenic crops. Several methods have been reported to create marker gene–free transformed plants, for example co-transformation, transposable elements, site-specific recombination, or intrachromosomal recombination3,4,5,6,7,8,9. Not only are most of these systems time-consuming and inefficient, but they are also employed on the assumption that isolation of transformants without a selective marker gene is not feasible10. Here we present a method that permits the identification of transgenic plants without the use of selectable markers. This strategy relies on the transformation of tissue explants or cells with a virulent A. tumefaciens strain and selection of transformed cells or shoots after PCR analysis. Incubation of potato explants with A. tumefaciens strain AGL0 resulted in transformed shoots at an efficiency of 1–5% of the harvested shoots, depending on the potato genotype used. Because this system does not require genetic segregation or site-specific DNA-deletion systems to remove marker genes, it may provide a reliable and efficient tool for generating transgenic plants for commercial use, especially in vegetatively propagated species like potato and cassava. More... »
PAGES439-442
http://scigraph.springernature.com/pub.10.1038/nbt801
DOIhttp://dx.doi.org/10.1038/nbt801
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/12627169
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