Gruner, Katrin, Zeier, Tatyana, Aretz, Christina and Zeier, Juergen (2018). A critical role for Arabidopsis MILDEW RESISTANCE LOCUS O2 in systemic acquired resistance. Plant J., 94 (6). S. 1064 - 1083. HOBOKEN: WILEY. ISSN 1365-313X

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Abstract

Members of the MILDEW RESISTANCE LOCUSO (MLO) gene family confer susceptibility to powdery mildews in different plant species, and their existence therefore seems to be disadvantageous for the plant. We recognized that expression of the Arabidopsis MLO2 gene is induced after inoculation with the bacterial pathogen Pseudomonas syringae, promoted by salicylic acid (SA) signaling, and systemically enhanced in the foliage of plants exhibiting systemic acquired resistance (SAR). Importantly, distinct mlo2 mutant lines were unable to systemically increase resistance to bacterial infection after inoculation with P.syringae, indicating that the function of MLO2 is necessary for biologically induced SAR in Arabidopsis. Our data also suggest that the close homolog MLO6 has a supportive but less critical role in SAR. In contrast to SAR, basal resistance to bacterial infection was not affected in mlo2. Remarkably, SAR-defective mlo2 mutants were still competent in systemically increasing the levels of the SAR-activating metabolites pipecolic acid (Pip) and SA after inoculation, and to enhance SAR-related gene expression in distal plant parts. Furthermore, although MLO2 was not required for SA- or Pip-inducible defense gene expression, it was essential for the proper induction of disease resistance by both SAR signals. We conclude that MLO2 acts as a critical downstream component in the execution of SAR to bacterial infection, being required for the translation of elevated defense responses into disease resistance. Moreover, our data suggest a function for MLO2 in the activation of plant defense priming during challenge by P.syringae.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Gruner, KatrinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zeier, TatyanaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aretz, ChristinaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zeier, JuergenUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-185183
DOI: 10.1111/tpj.13920
Journal or Publication Title: Plant J.
Volume: 94
Number: 6
Page Range: S. 1064 - 1083
Date: 2018
Publisher: WILEY
Place of Publication: HOBOKEN
ISSN: 1365-313X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PIPECOLIC ACID BIOSYNTHESIS; SALICYLIC-ACID; POWDERY MILDEW; PLANT IMMUNITY; CELL-DEATH; MLO FAMILY; DISEASE RESISTANCE; MONOOXYGENASE FMO1; FUNCTIONAL-ASPECTS; DEFICIENT MUTANTSMultiple languages
Plant SciencesMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/18518

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