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Background  Huanglongbing (HLB, previously known as citrus greening), is associated with  Candidatus  Liberibacter species and is a serious threat to citrus production world-wide. The pathogen is a Gram negative, unculturable, phloem-limited bacterium with limited known genomic information. Expanding the genetic knowledge of this organism may provide better understanding of the pathogen and possibly develop effective strategies for control and management of HLB.    Results  Here, we report cloning and characterization of an additional 14.7 Kb of new genomic sequences from three different genomic regions of the  Candidatus  Liberibacter asiaticus (Las). Sequence variation analyses among the available  Ca . Liberibacter species sequences as well as the newly cloned 1.5 Kb of  rpo B gene from different  Ca . Liberibacter strains have identified INDELs and SNPs. Phylogenetic analysis of the deduced protein sequences from the cloned regions characterizes the HLB-associated  Candidatus  Liberibacter as a new clade in the sub-division of the α-proteobacteria.    Conclusion  Comparative analyses of the cloned gene regions of  Candidatus  Liberibacter with members of the order Rhizobiales suggest overall gene structure and order conservation, albeit with minor variations including gene decay due to the identified pseudogenes. The newly cloned gene regions contribute to our understanding of the molecular aspects of genomic evolution of  Ca . Liberibacter.

Comparative phylogenomics and multi-gene cluster analyses of the Citrus Huanglongbing (HLB)-associated bacterium Candidatus Liberibacter