PuSH - Publikationsserver des Helmholtz Zentrums München: Bacteria-triggered systemic immunity in barley appears to be associated with WRKY and ETHYLENE RESPONSIVE FACTORs but not with salicylic acid.

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Dey, S. ; Wenig, M. ; Langen, G.* ; Sharma, S. ; Kugler, K.G. ; Knappe, C. ; Hause, B.* ; Bichlmeier, M. ; Babaeizad, V.* ; Imani, J.* ; Janzik, I.* ; Stempfl, T.* ; Hueckelhoven, R.* ; Kogel, K.H.* ; Mayer, K.F.X. ; Vlot, A.C.

Bacteria-triggered systemic immunity in barley appears to be associated with WRKY and ETHYLENE RESPONSIVE FACTORs but not with salicylic acid.

Plant Physiol. 166, 2133-2151 (2014)

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Leaf-to-leaf, systemic immune signaling known as systemic acquired resistance (SAR) is poorly understood in monocotyledonous plants. Here, we characterize systemic immunity in barley (Hordeum vulgare) triggered after primary leaf infection with either Pseudomonas syringae pathovar japonica (Psj) or Xanthomonas translucens pathovar cerealis (Xtc). Both pathogens induced resistance in systemic, uninfected leaves against a subsequent challenge infection with Xtc. In contrast to SAR in Arabidopsis thaliana, systemic immunity in barley was not associated with NONEXPRESSOR OF PATHOGENESIS-RELATED GENES1 or the local or systemic accumulation of salicylic acid (SA). Instead, we documented a moderate local but not systemic induction of abscisic acid (ABA) after infection of leaves with Psj. In contrast to SA or its functional analog benzothiadiazole, local applications of the jasmonic acid methyl ester or ABA triggered systemic immunity to Xtc. RNA-seq analysis of local and systemic transcript accumulation revealed unique gene expression changes in response to both Psj and Xtc and a clear separation of local from systemic responses. The systemic response appeared relatively modest and quantitative RT-PCR associated systemic immunity with the local and systemic induction of two WRKY and two ETHYLENE RESPONSIVE FACTOR-like transcription factors. Systemic immunity against Xtc was further associated with transcriptional changes after a secondary/systemic Xtc challenge infection; these changes were dependent on the primary treatment. Taken together, bacteria-induced systemic immunity in barley may be mediated in part by WRKY and ERF-like transcription factors possibly facilitating transcriptional reprogramming to potentiate immunity.

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