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Agronomy 2018, 8(8), 142;

Arabidopsis thaliana Immunity-Related Compounds Modulate Disease Susceptibility in Barley

Helmholtz Zentrum München, Department of Environmental Science, Institute of Biochemical Plant Pathology, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
Author to whom correspondence should be addressed.
Received: 6 July 2018 / Revised: 31 July 2018 / Accepted: 4 August 2018 / Published: 7 August 2018
(This article belongs to the Special Issue Biotic and Abiotic Stress Responses in Crop Plants)
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Plants are exposed to numerous pathogens and fend off many of these with different phytohormone signalling pathways. Much is known about defence signalling in the dicotyledonous model plant Arabidopsisthaliana, but it is unclear to which extent knowledge from model systems can be transferred to monocotyledonous plants, including cereal crops. Here, we investigated the defence-inducing potential of Arabidopsis resistance-inducing compounds in the cereal crop barley. Salicylic acid (SA), folic acid (Fol), and azelaic acid (AzA), each inducing defence against (hemi-)biotrophic pathogens in Arabidopsis, were applied to barley leaves and the treated and systemic leaves were subsequently inoculated with Xanthomonastranslucens pv. cerealis (Xtc), Blumeria graminis f. sp. hordei (powdery mildew, Bgh), or Pyrenophora teres. Fol and SA reduced Bgh propagation locally and/or systemically, whereas Fol enhanced Xtc growth in barley. AzA reduced Bgh propagation systemically and enhanced Xtc growth locally. Neither SA, Fol, nor AzA influenced lesion sizes caused by the necrotrophic fungus P. teres, suggesting that the tested compounds exclusively affected growth of (hemi-)biotrophic pathogens in barley. In addition to SA, Fol and AzA might thus act as resistance-inducing compounds in barley against Bgh, although adverse effects on the growth of pathogenic bacteria, such as Xtc, are possible. View Full-Text
Keywords: systemic acquired resistance; barley; salicylic acid; folic acid; azelaic acid; Blumeria graminis f. sp. hordei systemic acquired resistance; barley; salicylic acid; folic acid; azelaic acid; Blumeria graminis f. sp. hordei

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lenk, M.; Wenig, M.; Mengel, F.; Häußler, F.; Vlot, A.C. Arabidopsis thaliana Immunity-Related Compounds Modulate Disease Susceptibility in Barley. Agronomy 2018, 8, 142.

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