Monitoring Pseudomonas syringae Growth in Agroinfiltrated Leaves: The "Agromonas" Assay.

We recently developed a simple method called \"agromonas\" which facilitates the detection of Pseudomonas syringae growth in agroinfiltrated leaves expressing genes of interest. This protocol consists of agroinfiltration followed by inoculation of Pseudomonas syringae by either infiltration or spray inoculation. Next, bacterial growth is measured a few days later by plating leaf extracts out on P. syringae-selective medium. In this protocol, we describe all the steps required for agroinfiltration, inoculation of P. syringae by both injection and spray infection and explain how to quantify in planta live bacteria.