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The Arabidopsis ISR1 Locus is Required for Rhizobacteria‐Mediated Induced Systemic Resistance Against Different Pathogens
Author(s) -
Ton J.,
Pelt J. A.,
Loon L. C.,
Pieterse C. M. J.
Publication year - 2002
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1055/s-2002-25738
Subject(s) - biology , pseudomonas syringae , jasmonic acid , rhizobacteria , arabidopsis , salicylic acid , systemic acquired resistance , locus (genetics) , plant disease resistance , pseudomonas fluorescens , xanthomonas campestris , botany , pathogen , microbiology and biotechnology , genetics , bacteria , mutant , rhizosphere , gene
In Arabidopsis thaliana, non‐pathogenic, root‐colonizing Pseudomonas fluorescens WCS417r bacteria trigger an induced systemic resistance (ISR) that is phenotypically similar to pathogen‐induced systemic acquired resistance (SAR). In contrast to SAR, WCS417r‐mediated ISR is controlled by a salicylic acid (SA)‐independent signalling pathway that requires an intact response to the plant hormones jasmonic acid (JA) and ethylene (ET). Arabidopsis accessions RLD1 and Ws‐0 fail to express ISR against Pseudomonas syringae pv. tomato and show enhanced disease susceptibility to this pathogen. Genetic analysis of progeny from crosses between WCS417r‐responsive and non‐responsive accessions demonstrated that ISR inducibility and basal resistance against P. syringae pv. tomato are controlled by a single dominant locus (ISR1) on chromosome III (Ton et al., 1999 [294] ). Here, we investigated the role of the ISR1 locus in ISR, SAR and basal resistance against three additional pathogens: Xanthomonas campestris pv. armoraciae, Peronospora parasitica and turnip crinkle virus (TCV), using accessions Col‐0 (ISR1), RLD1 (isr1) and Ws‐0 (isr1) as host plants.