title: 'Ca. Liberibacter asiaticus' carries an excision plasmid prophage and a chromosomally integrated prophage that becomes lytic in plant infections.
abstract: Huanglongbing (HLB), also known as citrus greening, is a lethal disease of citrus caused by several species of 'Candidatus Liberibacter', a psyllid-transmitted, phloem-limited, alpha proteobacteria. 'Ca. Liberibacter asiaticus' is widespread in Florida citrus. The recently published 'Ca. L. asiaticus' psy62 genome, derived from a psyllid, revealed a prophage-like region of DNA in the genome, but phage have not been associated with 'Ca. L. asiaticus' to date. In the present study, shotgun sequencing and a fosmid DNA library of curated 'Ca. L. asiaticus' UF506, originally derived from citrus symptomatic for HLB, revealed two largely homologous, circular phage genomes, SC1 and SC2. SC2 encoded putative adhesin and peroxidase genes that had not previously been identified in 'Ca. L. asiaticus' and which may be involved in lysogenic conversion. SC2 also appeared to lack lytic cycle genes and replicated as a prophage excision plasmid, in addition to being found integrated in tandem with SC1 in the UF506 chromosome. By contrast, SC1 carried suspected lytic cycle genes and was found in nonintegrated, lytic cycle forms only in planta. Phage particles associated with 'Ca. L. asiaticus' were found in the phloem of infected periwinkles by transmission electron microscopy. In psyllids, both SC1 and SC2 were found only as prophage.
authors.affiliation: Plant Pathology Dept., University of Florida, Gainesville, FL 32611, USA.
authors.forename: Shujian
authors.initials: S
authors.lastname: Zhang
authors.forename: Zomary
authors.initials: Z
authors.lastname: Flores-Cruz
authors.forename: Lijuan
authors.initials: L
authors.lastname: Zhou
authors.forename: Byung-Ho
authors.initials: BH
authors.lastname: Kang
authors.forename: Laura A
authors.initials: LA
authors.lastname: Fleites
authors.forename: Mark D
authors.initials: MD
authors.lastname: Gooch
authors.forename: Nelson A
authors.initials: NA
authors.lastname: Wulff
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Davis
authors.forename: Yong-Ping
authors.initials: YP
authors.lastname: Duan
authors.forename: Dean W
authors.initials: DW
authors.lastname: Gabriel
mesh_terms: D000818:Animals; D001435:Bacteriophages / Q000145:classification / Q000235:genetics* / Q000502:physiology* / Q000648:ultrastructure; D002876:Chromosomes, Bacterial / Q000821:virology; D002957:Citrus / Q000382:microbiology; D034182:Cuscuta / Q000382:microbiology; D004269:DNA, Bacterial / Q000235:genetics; D004270:DNA, Circular; D004279:DNA, Viral; D005431:Florida; D016679:Genome, Viral; D006430:Hemiptera / Q000382:microbiology; D046529:Microscopy, Electron, Transmission; D058977:Molecular Sequence Annotation; D052585:Phloem / Q000382:microbiology / Q000648:ultrastructure; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology*; D010957:Plasmids; D039002:Prophages / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification / Q000502:physiology; D018741:Replication Origin; D012230:Rhizobiaceae / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity / Q000821:virology*; D017422:Sequence Analysis, DNA; D031053:Vinca / Q000382:microbiology / Q000648:ultrastructure; D014775:Virus Activation; D016662:Virus Integration; D014779:Virus Replication
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular; D004279:DNA, Viral