Pseudomonas putida induces resistance to Fusarium oxysporum f. sp. radicis-lycopersici in tomato plants by activating expression of defense-related genes

Plant growth-promoting rhizobacteria (PGPR) may prevent attack from pathogenic microorganisms by eliciting induced systemic resistance (ISR). In the present work, Pseudomonas putida isolate TR21/1 showed significant biological control of tomato seedlings inoculated with Fusarium oxysporum f.sp. radicis-lycopersici (FORL). Here, SA-responsive genes PR-1, PR-4, PR-6 and CH9 were downregulated upon induction ISR P. strain when bacterized roots FORL. This indicates that SAR involves accumulation but does not. Similarly, expression ET-regulated such as ACO1, ACO3, ACO4 not in ISR-expressing treatment only ACO2 suggesting is involved seedlings. contrast, infection expressing plants FORL strongly ACO2, ACO1 indicating transcriptional regulation ACO response to which be related possible ethylene synthesis pathogen. Here increased ETR1 gene this was upregulated presence plays a role protection against reducing sensitivity. Activation SA-and ET- regulated implies SA other signals well, play an important inducing resistance.