Abstract
The transcript levels of six defense genes including pathogenesis-related gene 1 (PR-1), pathogenesis-related gene 2 (PR-2), pathogenesis-related gene 5 (PR-5), lipoxygenase (LOX), phenylalanine ammonia-lyase (PAL) and catalase (CAT) were investigated in tomato plants inoculated with Xanthomonas axonopodis pv. phaseoli as a non-host pathogen and X. euvesicatoria as a host pathogen. Activation of all the genes was confirmed in both host and non-host treatments. Additionally, the results showed stronger expression of majority of the genes (PR-1, PR-2, LOX, PAL and CAT) in non-host treatment compared to host treatment at least at early hours after inoculation. These data suggest that faster and more expression of PR-1, PR-2, LOX, PAL and CAT might have a role in non-host resistance of tomato against X. axonopodis pv. phaseoli.