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Samples of loropetalum(Loropetalum chinensis)with stem cankers were submitted for diagnosis to the UF and FDACS-DPI diagnostic laboratories from Alabama and Florida nurseries in 2012.A fluorescing bacterium was isolated from the cankers and a study commenced to determine the identity and host range of the bacterium.A collection of isolates from symptomatic loropetalum plants was tested by multi-locus sequence analysis(MLSA),BiologTM,fatty acid analysis,LOPAT,semi-selective culturing,and greenhouse inoculations.Partial 16S sequence analysis,semiselective culturing,Biolog,and fatty acid analysis were not able to differentiate the loropetalum pathogen from other related Pseudomonas species or pathovars.Inoculation studies confirmed that olive was not a host of the bacterium.MLSA with housekeeping and gall-formation genes confirmed that the bacterium is a new pathovar of Pseudomonas syringae,P.syringae pv.loropetali.