| Title: | Airborne signals from Trichoderma fungi stimulate iron uptake responses in roots resulting in priming of jasmonic acid-dependent defences in shoots of Arabidopsis thaliana and Solanum lycopersicum |
| Author(s): | Martinez-Medina A; Van Wees SCM; Pieterse CMJ; |
| Address: | "Plant-Microbe Interactions, Department of Biology, Utrecht University, 3584 CH, Utrecht, The Netherlands. Molecular Interaction Ecology, German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Institute of Ecology, Friedrich Schiller University, Leipzig, 04103, Germany" |
| ISSN/ISBN: | 1365-3040 (Electronic) 0140-7791 (Linking) |
| Abstract: | "Root colonization by Trichoderma fungi can trigger induced systemic resistance (ISR). In Arabidopsis, Trichoderma-ISR relies on the transcription factor MYB72, which plays a dual role in the onset of ISR and the activation of Fe uptake responses. Volatile compounds (VCs) from rhizobacteria are important elicitors of MYB72 in Arabidopsis roots. Here, we investigated the mode of action of VCs from Trichoderma fungi in the onset of ISR and Fe uptake responses. VCs from Trichoderma asperellum and Trichoderma harzianum were applied in an in vitro split-plate system with Arabidopsis or tomato seedlings. Locally, Trichoderma-VCs triggered MYB72 expression and molecular, physiological and morphological Fe uptake mechanisms in Arabidopsis roots. In leaves, Trichoderma-VCs primed jasmonic acid-dependent defences, leading to an enhanced resistance against Botrytis cinerea. By using Arabidopsis micrografts of VCs-exposed rootstocks and non-exposed scions, we demonstrated that perception of Trichoderma-VCs by the roots leads to a systemic signal that primes shoots for enhanced defences. Trichoderma-VCs also elicited Fe deficiency responses and shoot immunity in tomato, suggesting that this phenomenon is expressed in different plant species. Our results indicate that Trichoderma-VCs trigger locally a readjustment of Fe homeostasis in roots, which links to systemic elicitation of ISR by priming of jasmonic acid-dependent defences" |
| Keywords: | Air Arabidopsis/drug effects/*immunology/metabolism Arabidopsis Proteins/metabolism Cyclopentanes/*metabolism Disease Resistance/drug effects Iron/*metabolism Solanum lycopersicum/drug effects/*immunology Oxylipins/*metabolism Plant Diseases/microbiology; |
| Notes: | "MedlineMartinez-Medina, Ainhoa Van Wees, Saskia C M Pieterse, Corne M J eng 2017/07/02 Plant Cell Environ. 2017 Nov; 40(11):2691-2705. doi: 10.1111/pce.13016. Epub 2017 Aug 24" |
