constructs described in Figure 1 and cultivated for 20h at 29°C in LB medium containing 50 µg/ml kanamycin. Agrobacteria cells were pelleted by centrifugation, resuspended and diluted in infiltration medium (10mM MES, pH 5.8, 10mM MgCl2 and 100 µM acetosyringone) to an OD600 nm of 0.5 and incubated at room temperature for 2 h. The Agrobacterium solution was inoculated by syringe into holes in the leaves of one-monthold Nicotiana benthamiana plants. Leaves were used for analysis three days after inoculation for all experiments, except those depicted in Figure 3D and E, in which leaves were used six days after inoculation.