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Agrobacterium tumefaciens-Mediated Transient Transformation of Arabidopsis thaliana Leaves

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Transient assays provide a convenient alternative to stable transformation. Compared to the generation of stably transformed plants, agroinfiltration is more rapid, and samples can be analyzed a few days after inoculation. Nevertheless, at difference of tobacco and other plant species, Arabidopsis thaliana remains recalcitrant to routine transient assays. In this chapter, we describe a transient expression assay using simple infiltration of intact Arabidopsis leaves with Agrobacterium tumefaciens carrying a plasmid expressing a reporter fluorescent protein. In this protocol, Agrobacterium aggressiveness was increased by a prolonged treatment in an induction medium deficient in nutrients and containing acetosyringone. Besides, Arabidopsis plants were cultivated in intermediate photoperiod (12 h light–12 h dark) to promote leaf growth.
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