No significant change in the transcripts level of PR1 was observed between Pst DC3000 and S. meliloti Sm2011 infection, while the expression of PR5 increased significantly at 1, 3, and 5 dpi with Pst DC3000 strains and is lower in co-inoculated plants than in those inoculated with Pst DC3000 alone (Figures 6A,B). This evidence concerns the gene TMEM37 and infection.