ERF and infection: The ethylene biosynthesis genes ACC synthase (ACS, Solyc08g081540, 13.38-fold) and ACC oxidase (ACO, Solyc12g005940, 463.4-fold) were activated concomitant with the induction of the ethylene receptor (ETR, Solyc09g065310, 17.36-fold) and ethylene-responsive transcription factor 1a (ERF, Solyc08g007230, 38.10-fold) upon infection with DC3000.