title: Dimethyl disulfide is an induced systemic resistance elicitor produced by Bacillus cereus C1L.
abstract: BACKGROUND
  Bacillus cereus C1L is a plant growth-promoting rhizobacterium and can elicit induced systemic resistance (ISR) in plants against necrotrophic pathogens. However, little is known about ISR elicitors produced by B. cereus C1L, and no ISR elicitor has been identified and characterised. Therefore, the objective of this study is to identify volatile ISR elicitor(s) produced by B. cereus C1L.
  
  
  RESULTS
  The volatile metabolites produced by B. cereus C1L were extracted, separated and identified by solid-phase microextraction, gas chromatography and mass spectrometry. Dimethyl disulfide (DMDS) was the only separated metabolite being determined. Afterwards, application of DMDS by means of soil drench significantly protected tobacco and corn plants against Botrytis cinerea and Cochliobolus heterostrophus, respectively, under greenhouse conditions. The results reveal that DMDS could play an important role in ISR by B. cereus C1L.
  
  
  CONCLUSIONS
  This is the first report of DMDS as an elicitor produced by an ISR-eliciting B. cereus strain and its ability to suppress plant fungal diseases under greenhouse conditions. It is suggested that DMDS has potential for practical use in controlling plant foliar diseases besides soil fumigation.
authors.affiliation: Department of Plant Pathology and Microbiology, National Taiwan University, Taipei, Taiwan.
authors.forename: Chien-Jui
authors.initials: CJ
authors.lastname: Huang
authors.forename: Jia-Fang
authors.initials: JF
authors.lastname: Tsay
authors.forename: Shu-Yu
authors.initials: SY
authors.lastname: Chang
authors.forename: Hsiu-Ping
authors.initials: HP
authors.lastname: Yang
authors.forename: Wen-Shi
authors.initials: WS
authors.lastname: Wu
authors.forename: Chao-Ying
authors.initials: CY
authors.lastname: Chen
mesh_terms: D001409:Bacillus cereus / Q000737:chemistry / Q000276:immunology* / Q000502:physiology; D020171:Botrytis / Q000187:drug effects / Q000254:growth & development; D060467:Disease Resistance; D004220:Disulfides / Q000032:analysis / Q000276:immunology* / Q000494:pharmacology; D007113:Immunity, Innate; D010935:Plant Diseases / Q000276:immunology* / Q000382:microbiology; D014026:Nicotiana / Q000276:immunology / Q000382:microbiology; D055549:Volatile Organic Compounds / Q000032:analysis / Q000276:immunology / Q000494:pharmacology; D003313:Zea mays / Q000276:immunology / Q000382:microbiology
chemical_list: D004220:Disulfides; D055549:Volatile Organic Compounds; C021181:dimethyl disulfide