Abstract
We have developed a high-throughput Agrobacterium-mediated transformation model system using both nptII and the 5-enolpyruvylshikimate-3-phosphate synthase gene from Agrobacterium tumefaciens strain CP4 (cp4) based selections in MicroTom, a miniature rapid-cycling cherry tomato variety. With the NPTII selection system, transformation frequency calculated as independent transgenic events per inoculated explant ranged from 24 to 80% with an average of 56%, in industrial production scale transformation experiments. For CP4, with glyphosate selection, the average transformation frequency was 57%. Stable transformation frequency was positively correlated with transient expression (R=0.85), and variable with the genes of interest. DNA integration and germline transformation were confirmed by biological assay, Southern Blot analysis, and R1 phenotype segregation. Transgene expression was observed in leaf, root, stem, flower, and fruit tissues of the transgenic plants. Ninety-five percent of transgenic events coexpressed two introduced genes based on β-glucuronidase (GUS) and neonmycin phosphotransferase II (NPTII) expression. Seventy-five percent of transgenic events contained one to two copies of the introduced uidA (GUS) gene based on Southern analysis. Transgenic plants from the cotyledon explants to the transgenic plants transferred to soil were produced within about 2–3 months depending on the genes of interest. The utility of this MicroTom model transformation system for functional genomic studies, such as identification of genes related to important agricultural traits and gene function, is discussed.
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Acknowledgements
The authors would like to thank David Duncan for critically reviewing the manuscript and for helpful suggestions. The authors are grateful to Jeanne Layton and Pamela Delaquil for providing us technical information on standard tomato transformation at Monsanto. The authors would like to thank Linda Lahman, Salim Hakimi, Glenda Debrecht, and Bei Zhang for their technical assistance.
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Communicated by M. C. Jordan
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Dan, Y., Yan, H., Munyikwa, T. et al. MicroTom—a high-throughput model transformation system for functional genomics. Plant Cell Rep 25, 432–441 (2006). https://doi.org/10.1007/s00299-005-0084-3
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DOI: https://doi.org/10.1007/s00299-005-0084-3