Impact of induced systemic resistance on the bacterial microbiomeof Arabidopsis thaliana


Abstract: Induced systemic resistance (ISR) has been described for several strains of fluorescentpseudomonads in a variety of crop plants and is effective against a wide range of pathogens.Using the model plant Arabidopsis thaliana, progress has been made in understanding signaltransduction pathways involved in induced resistance. Perception of ethylene and jasmonic acidis important for ISR. The traits of Pseudomonas spp. that can trigger ISR appear to be diverse,and include iron regulated metabolites, antibiotics, and lipopolysaccharides. Since pathogengrowth is restricted on plants that are in the state of ISR, we hypothesized that the indigenousmicroflora could also be affected by ISR. Using cultivation dependent techniques, effects of plantdefense signaling on the total bacterial and the Pseudomonas spp. microflora of Arabidopsis werestudied and related to susceptibility of Arabidopsis genotypes to bacterial speck caused byPseudomonas syringae pv. tomato.

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