Cytokinins mediate resistance against Pseudomonas syringae in tobacco through increased antimicrobial phytoalexin synthesis independent of salicylic acid signaling

Dominik Kilian Grosskinsky, Muhammad Naseem, Usama Ramadan Abdelmohsen, Nicole Plickert, Thomas Engelke, Thomas Griebel, Juergen Zeier, Ondrej Novak, Miroslav Strnad, Hartwig Pfeifhofer, Eric van der Graaff, Uwe Simon, Thomas Georg Roitsch