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Author Zuniga, A.; Donoso, R.A.; Ruiz, D.; Ruz, G.A.; Gonzalez, B. pdf  doi
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  Title Quorum-Sensing Systems in the Plant Growth-Promoting Bacterium Paraburkholderia phytofirmans PsJN Exhibit Cross-Regulation and Are Involved in Biofilm Formation Type Journal Article
  Year 2017 Publication Molecular Plant-Microbe Interactions Abbreviated Journal Mol. Plant-Microbe Interact.  
  Volume 30 Issue 7 Pages (down) 557-565  
  Keywords  
  Abstract Quorum-sensing systems play important roles in host colonization and host establishment of Burkholderiales species. Beneficial Paraburkholderia species share a conserved quorum-sensing (QS) system, designated BraI/R, that controls different phenotypes. In this context, the plant growth-promoting bacterium Paraburkholderia phytofirmans PsJN possesses two different homoserine lactone QS systems BpI. 1/R.1 and BpI. 2/R.2 (BraI/R-like QS system). The BpI. 1/R.1 QS system was previously reported to be important to colonize and produce beneficial effects in Arabidopsis thaliana plants. Here, we analyzed the temporal variations of the QS gene transcript levels in the wild-type strain colonizing plant roots. The gene expression patterns showed relevant differences in both QS systems compared with the wild-type strain in the unplanted control treatment. The gene expression data were used to reconstruct a regulatory network model of QS systems in P.phytofirmans PsJN, using a Boolean network model. Also, we examined the phenotypic traits and transcript levels of genes involved in QS systems, using P. phytofirmans mutants in homoserine lactone synthases genes. We observed that the BpI. 1/R.1 QS system regulates biofilm formation production in strain PsJN and this phenotype was associated with the lower expression of a specific extracytoplasmic function sigma factor ecf26.1 gene (implicated in biofilm formation) in the bpI.1 mutant strain.  
  Address [Gonzalez, Bernardo] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Millennium Nucleus Ctr Plant Syst & Synthet Biol, Santiago, Chile, Email: bernardo.gonzalez@uai.cl  
  Corporate Author Thesis  
  Publisher Amer Phytopathological Soc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0894-0282 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000404048400004 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 739  
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