To gain more insight into the molecular mechanisms involved in B. subtilis and P. fluorescens-ISR against necrotrophic and hemibiotrophic pathogens, the transcript levels of PR1 (SA-responsive, [50]; PDF1.2 (ET/JA-responsive, [51] and PR4 (ET-inducible, [52] were examined in Arabidopsis leaves after infection with B. cinerea and Pst DC3000. This evidence concerns the gene TMEM37 and infection.