title: Bacterial disease resistance in Arabidopsis through flagellin perception.
abstract: Plants and animals recognize microbial invaders by detecting pathogen-associated molecular patterns (PAMPs) such as flagellin. However, the importance of flagellin perception for disease resistance has, until now, not been demonstrated. Here we show that treatment of plants with flg22, a peptide representing the elicitor-active epitope of flagellin, induces the expression of numerous defence-related genes and triggers resistance to pathogenic bacteria in wild-type plants, but not in plants carrying mutations in the flagellin receptor gene FLS2. This induced resistance seems to be independent of salicylic acid, jasmonic acid and ethylene signalling. Wild-type and fls2 mutants both display enhanced resistance when treated with crude bacterial extracts, even devoid of elicitor-active flagellin, indicating the existence of functional perception systems for PAMPs other than flagellin. Although fls2 mutant plants are as susceptible as the wild type when bacteria are infiltrated into leaves, they are more susceptible to the pathogen Pseudomonas syringae pv. tomato DC3000 when it is sprayed on the leaf surface. Thus, flagellin perception restricts bacterial invasion, probably at an early step, and contributes to the plant's disease resistance.
authors.affiliation: Friedrich Miescher Institute for Biomedical Research, PO Box 2543, CH-4002 Basel, Switzerland.
authors.forename: Cyril
authors.initials: C
authors.lastname: Zipfel
authors.forename: Silke
authors.initials: S
authors.lastname: Robatzek
authors.forename: Lionel
authors.initials: L
authors.lastname: Navarro
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Oakeley
authors.forename: Jonathan D G
authors.initials: JD
authors.lastname: Jones
authors.forename: Georg
authors.initials: G
authors.lastname: Felix
authors.forename: Thomas
authors.initials: T
authors.lastname: Boller
mesh_terms: D017360:Arabidopsis / Q000187:drug effects / Q000235:genetics / Q000382:microbiology* / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D002457:Cell Extracts / Q000494:pharmacology; D005408:Flagellin / Q000378:metabolism*; D007113:Immunity, Innate / Q000187:drug effects / Q000235:genetics / Q000502:physiology*; D009154:Mutation / Q000235:genetics; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology*; D010937:Plant Growth Regulators / Q000494:pharmacology; D030821:Plants, Genetically Modified; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism*; D044224:Pseudomonas syringae / Q000254:growth & development / Q000302:isolation & purification / Q000502:physiology; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D029681:Arabidopsis Proteins; D002457:Cell Extracts; D010937:Plant Growth Regulators; D005408:Flagellin; D011494:Protein Kinases; C411853:FLS2 protein, Arabidopsis