Systemic acquired resistance networks amplify airborne defense cues

Marion Wenig, Andrea Ghirardo, Jennifer H. Sales, Elisabeth S. Pabst, Heiko H. Breitenbach, Felix Antritter, Baris Weber, Birgit Lange, Miriam Lenk, Robin K. Cameron, Joerg-Peter Schnitzler and A. Corina Vlot ()
Additional contact information
Marion Wenig: Institute of Biochemical Plant Pathology
Andrea Ghirardo: Research Unit Environmental Simulation
Jennifer H. Sales: Institute of Biochemical Plant Pathology
Elisabeth S. Pabst: Institute of Biochemical Plant Pathology
Heiko H. Breitenbach: Institute of Biochemical Plant Pathology
Felix Antritter: Research Unit Environmental Simulation
Baris Weber: Research Unit Environmental Simulation
Birgit Lange: Institute of Biochemical Plant Pathology
Miriam Lenk: Institute of Biochemical Plant Pathology
Robin K. Cameron: McMaster University, Faculty of Science
Joerg-Peter Schnitzler: Research Unit Environmental Simulation
A. Corina Vlot: Institute of Biochemical Plant Pathology

Nature Communications, 2019, vol. 10, issue 1, 1-14

Abstract: Abstract Salicylic acid (SA)-mediated innate immune responses are activated in plants perceiving volatile monoterpenes. Here, we show that monoterpene-associated responses are propagated in feed-forward loops involving the systemic acquired resistance (SAR) signaling components pipecolic acid, glycerol-3-phosphate, and LEGUME LECTIN-LIKE PROTEIN1 (LLP1). In this cascade, LLP1 forms a key regulatory unit in both within-plant and between-plant propagation of immunity. The data integrate molecular components of SAR into systemic signaling networks that are separate from conventional, SA-associated innate immune mechanisms. These networks are central to plant-to-plant propagation of immunity, potentially raising SAR to the population level. In this process, monoterpenes act as microbe-inducible plant volatiles, which as part of plant-derived volatile blends have the potential to promote the generation of a wave of innate immune signaling within canopies or plant stands. Hence, plant-to-plant propagation of SAR holds significant potential to fortify future durable crop protection strategies following a single volatile trigger.

Date: 2019
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DOI: 10.1038/s41467-019-11798-2

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