Abstract
Key message
Agroinfiltration is an efficient method to study transgene expression in plant tissue. In this study, sonication followed by vacuum infiltration is shown to increase agroinfiltration-mediated GUS expression in soybean.
Abstract
Agroinfiltration, a valuable tool for rapid analysis of gene function, has been used extensively on leaf tissue of Nicotiana benthamiana and several other plant species. However, the application of this approach for gene functionality studies in soybean has been largely unsuccessful. Improvements in agroinfiltration of many plants have been achieved through a variety of approaches to allow better delivery, penetration and infection of Agrobacterium to interior leaf tissues. In this work, an agroinfiltration approach was developed for transient expression in soybean utilizing sonication followed by vacuum infiltration of intact seedlings. The optimal infiltration buffer, sonication time, and vacuum conditions for agroinfiltration of soybean were evaluated by monitoring expression of an introduced β-glucuronidase (GUS) reporter gene. The developed method included the use of an infiltration buffer (10 mM 2-(N-morpholino)ethanesulfonic acid sodium salt, 10 mM MgCl2, 100 µM acetosyringone) supplemented with the reducing agent dithiothreitol, with 30 s sonication followed by vacuum infiltration. These techniques were further applied to evaluate five different Agrobacterium strains and six different plant genetic backgrounds. Among the Agrobacterium strains examined, J2 produced the highest levels of GUS activity and ‘Peking’ was the most responsive genotype.
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Acknowledgments
We thank Angela Parker for assistance in conducting infiltrations. Salaries and research support for this work were provided by the US soybean farmers’ checkoff through the United Soybean Board and State and Federal Funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University, including an OARDC Competitive Research Enhancement Seed Grant (Grant Number 2010-063).
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The authors declare that they have no conflict of interest.
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Communicated by Hiroyasu Ebinuma.
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King, J.L., Finer, J.J. & McHale, L.K. Development and optimization of agroinfiltration for soybean. Plant Cell Rep 34, 133–140 (2015). https://doi.org/10.1007/s00299-014-1694-4
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DOI: https://doi.org/10.1007/s00299-014-1694-4