Shiller, Jason

Summary A novel candidate species of the liberibacter genus, ‘ Candidatus Liberibacter brunswickensis’ ( CL br), was identified in the Australian eggplant psyllid, Acizzia solanicola . This is the first discovery of a species belonging to the liberibacter genus in Australia and the first report of a liberibacter species in the psyllid genus Acizzia . This new candidate liberibacter species has not been associated with plant disease, unlike other psyllid‐vectored species in the genus including ‘ Candidatus Liberibacter asiaticus ’ ( CL as), ‘ Candidatus Liberibacter africanus’ ( CL af) and ‘ Ca . Liberibacter solanacearum’ ( CL so). This study describes novel generic liberibacter genus primers, used to screen Australian psyllids for the presence of microflora that may confound diagnosis of exotic pathogens. CL br forms a unique clade in the liberibacter genus based on phylogenetic analysis of the 16S ribosomal ribonucleic acid ( rRNA ) region and multilocus sequence analysis ( MLSA ) of seven highly conserved genes, dnaG , gyrB , mutS , nusG , rplA , rpoB and tufB . The MLSA mapping approach described in this article was able to discriminate between two ‘ Ca . Liberibacter’ species within a metagenomic data set and represents a novel approach to detecting and differentiating unculturable species of liberibacter. Further, CL br can confound the Li et al . (2006) quantitative PCR ( qPCR ) diagnostic tests for CL as and CL af.