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Lenk, M. ; Wenig, M. ; Bauer, K. ; Hug, F. ; Knappe, C. ; Lange, B. ; Timsy, T. ; Häußler, F. ; Mengel, F. ; Dey, S. ; Schäffner, A. ; Vlot, A.C.

Pipecolic acid is induced in barley upon infection and triggers immune responses associated with elevated nitric oxide accumulation.

Mol. Plant Microbe Interact. 32, 1303-1313 (2019)
Publ. Version/Full Text DOI PMC
Pipecolic acid (Pip) is an essential component of systemic acquired resistance, priming resistance in Arabidopsis thaliana against (hemi) biotrophic pathogens. Here, we studied the potential role of Pip in bacteria-induced systemic immunity in barley. Exudates of barley leaves infected with the systemic immunity-inducing pathogen Pseudomonas syringae pv. japonica induced immune responses in A. thaliana. The same leaf exudates contained elevated Pip levels compared with those of mock-treated barley leaves. Exogenous application of Pip induced resistance in barley against the hemibiotrophic bacterial pathogen Xanthomonas translucens pv. cerealis. Furthermore, both a systemic immunity-inducing infection and exogenous application of Pip enhanced the resistance of barley against the biotrophic powdery mildew pathogen Blumeria graminis f. sp. hordei. In contrast to a systemic immunity-inducing infection, Pip application did not influence lesion formation by a systemically applied inoculum of the necrotrophic fungus Pyrenophora teres. Nitric oxide (NO) levels in barley leaves increased after Pip application. Furthermore, X. translucens pv. cerealis induced the accumulation of superoxide anion radicals and this response was stronger in Pip-pretreated compared with mock-pretreated plants. Thus, the data suggest that Pip induces barley innate immune responses by triggering NO and priming reactive oxygen species accumulation.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Hordeum Vulgare ; Nitric Oxide ; Pipecolic Acid ; Priming ; Plant Immunity ; Reactive Oxygen Species ; Systemic Acquired Resistance; Systemic Acquired-resistance; Powdery Mildew Fungus; Salicylic-acid; Disease Resistance; Hydrogen-peroxide; Azelaic-acid; Arabidopsis; Defense; Biosynthesis; Superoxide
ISSN (print) / ISBN 0894-0282
e-ISSN 1943-7706
Journal Molecular Plant-Microbe Interactions
Quellenangaben Volume: 32, Issue: 10, Pages: 1303-1313 Article Number: , Supplement: ,
Publisher American Phytopathological Society
Publishing Place 3340 Pilot Knob Road, St Paul, Mn 55121 Usa
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Biochemical Plant Pathology (BIOP)