Citrus Greening-HLB Genome Resources
other genome resources


Citrus greening (also known as Huanglongbing or HLB) is a devastating agricultural disease threatening citrus production in Florida and many other regions throughout the world. Genome sequence data provide a critically important foundation for characterization of candidate virulence factors, understanding the nutritional requirements and basic physiology, and identification of regions in the sequence suitable for diagnostic probe development.
This site is a community resource designed for dissemination of genome sequence data and related analyses of organisms associated with citrus greening (HLB) with emphasis on the genus Ca. Liberibacter. Analyses provided here are currently derived from publically available sequence data and can be accessed via the JBrowse genome viewer, with additional data and links found at Additional Genome Resources. The site also includes information on the Wolbachia endosymbiont (wDi) of Diaphorina citri, the Asian citrus psyllid vector of HLB. For information on registering for site updates, collaborating on genome assembly and analysis, and submission of unpublished data to the genome viewer, contact the site administrator. We have experience with a wide range of sequence assembly and analysis protocols.

View Liberibacter genomes and their annotated features - now in JBrowse

Portal for unpublished data: (inquire about data deposition)
Collaboration Opportunities
Additional Genome Resources

Links include:

Feature Index includes:

  • subcellular localization
  • predicted transcription factors
  • repetitive sequences
  • pseudogenes
  • horizontally transferred regions
Additional Resources

Liberibacter publication list (2000-2011) (Excel)


  • General CG-HLB Resources
  • Genome-related Information (outside links)
  • Florida Information Resources
  • Psyllid Genome Resources
Computational Tools Pred_cutoff: A transcription factor binding site prediction program for bacterial genomes


October 2014
JBrowse genome viewer launched
for a faster and smoother
user experience

September 2014
Featured publication
Ca. Liberibacter asiaticus
strain Ishi-1 sequenced

April 2014
Featured publication
Ca. Liberibacter asiaticus
strain A4 sequenced

January 2014
Featured publication

Gene differences between cultured and uncultured Liberibacter species

August 2013
Featured publication
Ca. Carsonalla and Ca. Profftella endosymbionts of ACP sequenced

July 2013
Ca. Liberibacter asiaticus
strain gxpsy (complete) and
Ca. Liberibacter americanus
strain PW_SP (pseudomolecule)
added to
GBrowse viewer

February 2013
Liberibacter crescens
added to
GBrowse viewer

January 2013
Wolbachia wDi and other bacterial
pathogens of citrus added to

GBrowse viewer

November 2012
Featured publication
Draft genome sequence for Wolbachia endosymbiont of ACP
Saha et al. PLoS ONE (article)

April 2012
Citrus Greening confirmed in California

(APHIS Bulletin (pdf))

April 2012
Featured publication

Conservation of Gene Order and Content in the Circular Chromosomes of 'Candidatus Liberibacter asiaticus' and Other Rhizobiales
Kuykendall et al. Plos One 7:34673 (abstract)

January 2012
Featured publication

Improved real-time PCR detection of 'Candidatus Liberibacter asiaticus' from citrus and psyllid hosts by targeting the intragenic tandem-repeats of its prophage genes
Morgan et al. Mol Cell Probes (abstract)

August 2011
Featured publication

Comparison of the 'Ca. Liberibacter asiaticus' genome adapted for an intracellular lifestyle with other members of the Rhizobiales
Hartung et al. Plos One 6:23289 (abstract)

July 2011
PCR primer design capability added to the
GBrowse viewer
Highlight gene or region of interest and let the program design your primers

May 2011
Featured publication

The Complete Genome Sequence of 'Candidatus Liberibacter solanacearum', the Bacterium Associated with Potato Zebra Chip Disease
Lin et al. PLoS One 6:19135 (abstract)

March 2011
Tracks added to Lso and Las displays in the GBrowse viewer highlighting unique regions between the two strains

January 2011
Lso CLso-ZC1 genome and Las UF506 phage sequences added to GBrowse viewer

January 2011
IRCHLB Grower Session Presentations online

link to talks

December 2010
Lso CLso-ZC1 genome sequence available

link to record at NCBI

December 2010
New server address and new features

for GBrowse genome viewer

December 2010
2011 HLB Conference Agenda set
see agenda here

September 2010
Upcoming Research Meeting
International Research Conference on Huanglongbing Jan 10-14, 2011
Orlando Florida
abstract submission now open

May 2010
Featured publication

Guangdong and Florida Populations of 'Candidatus Liberibacter asiaticus' Distinguished by a Genomic Locus with Short Tandem Repeats
Chen et al. Phytopath. 100:567 (abstract)

April 2010
Web site update:

Predicted post-translational modifications of Las proteins, repetitive sequences, and other features of the Las genome now available at the Genome features link

March 2010
Presentations online

Presentations from the 2009 Joint Research Conference on HBL/ACP and Zebra Chip posted by FritoLay (website)

January 2010
Featured publication:

A new diagnostic system for ultra sensitive and specific detection and quantification of Candidatus liberibacter asiaticus, the bacterium associated with citrus huanglongbing
Lin et al. J Microbiol Methods (abstract)

November 2009:
Featured publication:

Characterization of an ATP translocase identified in the destructive plant pathogen, Candidatus Liberibacter asiaticus
Vahling et al. J. Bacteriol. (abstract)

November 2009:
Featured publication:
Confirmation of the Sequence of ‘Candidatus Liberibacter asiaticus’ and Assessment of Microbial Diversity in Huanglongbing-Infected Citrus Phloem Using a Metagenomic Approach
Tyler et al. MPMI 22:1624 (abstract)

November 2009:
Featured publication:
Detection, Distribution, and Genetic Variability of Ca. Liberibacter species associated with Zebra Complex Disease of Potato in North America
Wen et al. Plant Disease 93:1102-15 (abstract)

October 2009:
Pseudogenes annotated in Las Psy62
revealing disruptions in critical metabolic genes(go to access data for more details)

September 2009:
Upcoming Research Meeting
Joint Research Conference on HLB and Zebra Chip, November 16-18, 2009.
McAllen, TX (more info)

July 2009:
Featured publication:

Complete Genome Sequence of Citrus Huanglongbing Bacterium, ‘Candidatus Liberibacter asiaticus’ Obtained Through Metagenomics
Duan, et al. MPMI 22:1011-1020 (abstract)

May 2009:
Featured publication:
Cultivation of 'Candidatus Liberibacter asiaticus', 'Ca. L. africanus', and 'Ca. L. americanus' Associated with Huanglongbing
Sechler, et al. Phytopathology 99:480-6(abstract)

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