Phylogenetic position and virulence apparatus of the pear flower necrosis pathogen Erwinia piriflorinigrans CFBP 5888 as assessed by comparative genomics |
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Authors: | Theo HM Smits Fabio Rezzonico María M López Jochen Blom Alexander Goesmann Jürg E Frey Brion Duffy |
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Affiliation: | 1. Agroscope Changins-Wädenswil ACW, Plant Protection Division, CH-8820 Wädenswil, Switzerland;2. Instituto Valenciano de Investigaciones Agrarias (IVIA), 46113 Moncada, Valencia, Spain;3. Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany |
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Abstract: | Erwinia piriflorinigrans is a necrotrophic pathogen of pear reported from Spain that destroys flowers but does not progress further into the host. We sequenced the complete genome of the type strain CFBP 5888T clarifying its phylogenetic position within the genus Erwinia, and indicating a position between its closest relative, the epiphyte Erwinia tasmaniensis and other plant pathogenic Erwinia spp. (i.e., the fire blight pathogen E. amylovora and the Asian pear pathogen E. pyrifoliae). Common features are the type III and type VI secretion systems, amylovoran biosynthesis and desferrioxamine production. The E. piriflorinigrans genome also provided the first evidence for production of the siderophore chrysobactin within the genus Erwinia sensu stricto, which up to now was mostly associated with phytopathogenic, soft-rot Dickeya and Pectobacterium species. Plasmid pEPIR37, reported in this strain, is closely related to small plasmids found in the fire blight pathogen E. amylovora and E. pyrifoliae. The genome of E. piriflorinigrans also gives detailed insights in evolutionary genomics of pathoadapted Erwinia. |
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Keywords: | CRISPR clustered regularly interspaced short palindromic repeats CRR CRISPR repeat region EPS exopolysaccharide ICE integrative conjugative element NRPS/PKS non-ribosomal peptide synthases/polyketide synthases T1SS type I secretion system T2SS type II secretion system T3SS type III secretion system T6SS type VI secretion system |
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