Concurrent Symposium: Plant cell pH: An emerging signal and secondary messenger Chair: A. S. Raghavendra, University of HyderabadA. S. Raghavendra, University of HyderabadJosé Feijo, University of MarylandTobias Maierhofer, University of WuerzburgShinji Masuda, Tokyo Institute of TechnologyAnett Steger, University of Copenhagen