Priming of camalexin accumulation in induced systemic resistance by beneficial bacteria against Botrytis cinerea and Pseudomonas syringae pv. tomato DC3000

Author:

Nguyen Ngoc Huu12,Trotel-Aziz Patricia1,Villaume Sandra1,Rabenoelina Fanja1,Clément Christophe1,Baillieul Fabienne1,Aziz Aziz1ORCID

Affiliation:

1. Induced Resistance and Plant Bioprotection USC INRAE 1488, SFR Condorcet FR-CNRS 3417, University of Reims, UFR Sciences , Campus Moulin de la Housse, 51687 Reims Cedex 02 , France

2. Department of Plant Biology, Faculty of Agriculture and Forestry, Tay Nguyen University , 567 Le Duan, Daklak , Vietnam

Abstract

Abstract Plants harbor various beneficial microbes that modulate their innate immunity, resulting in induced systemic resistance (ISR) against a broad range of pathogens. Camalexin is an integral part of Arabidopsis innate immunity, but the contribution of its biosynthesis in ISR is poorly investigated. We focused on camalexin accumulation primed by two beneficial bacteria, Pseudomonas fluorescens and Bacillus subtilis, and its role in ISR against Botrytis cinerea and Pseudomonas syringae Pst DC3000. Our data show that colonization of Arabidopsis thaliana roots by beneficial bacteria triggers ISR against both pathogens and primes plants for enhanced accumulation of camalexin and CYP71A12 transcript in leaf tissues. Pseudomonas fluorescens induced the most efficient ISR response against B. cinerea, while B. subtilis was more efficient against Pst DC3000. Analysis of cyp71a12 and pad3 mutants revealed that loss of camalexin synthesis affected ISR mediated by both bacteria against B. cinerea. CYP71A12 and PAD3 contributed significantly to the pathogen-triggered accumulation of camalexin, but PAD3 does not seem to contribute to ISR against Pst DC3000. This indicated a significant contribution of camalexin in ISR against B. cinerea, but not always against Pst DC3000. Experiments with Arabidopsis mutants compromised in different hormonal signaling pathways highlighted that B. subtilis stimulates similar signaling pathways upon infection with both pathogens, since salicylic acid (SA), but not jasmonic acid (JA) or ethylene, is required for ISR camalexin accumulation. However, P. fluorescens-induced ISR differs depending on the pathogen; both SA and JA are required for camalexin accumulation upon B. cinerea infection, while camalexin is not necessary for priming against Pst DC3000.

Funder

State-Region Planning Contracts

European Regional Development Fund

Campus France and the Vietnamese Government

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

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