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dc.contributor.authorTeixeira, D. D.
dc.contributor.authorSaillard, C.
dc.contributor.authorEveillard, S.
dc.contributor.authorDanet, J. L.
dc.contributor.authorda Costa, P. I.
dc.contributor.authorAyres, A. J.
dc.contributor.authorBove, J.
dc.date.accessioned2014-05-20T15:23:08Z
dc.date.available2014-05-20T15:23:08Z
dc.date.issued2005-09-01
dc.identifierhttp://dx.doi.org/10.1099/ijs.0.63677-0
dc.identifier.citationInternational Journal of Systematic and Evolutionary Microbiology. Reading: Soc General Microbiology, v. 55, p. 1857-1862, 2005.
dc.identifier.issn1466-5026
dc.identifier.urihttp://hdl.handle.net/11449/33975
dc.description.abstractSymptoms of huanglongbing (HLB) were reported in São Paulo State (SPS), Brazil, in March 2004. In Asia, HLB is caused by 'Candidatus Liberibacterasiaticus'and in Africa by 'Candidatus Liberibacter africanus'. Detection of the liberibacters is based on PCR amplification of their 16S rRNA gene with specific primers. Leaves with blotchy mottle symptoms characteristic of HLB were sampled in several farms of SIPS and tested for the presence of liberibacters. 'Ca. L. asiaticus' was detected in a small number of samples but most samples gave negative PCR results. Therefore, a new HLB pathogen was suspected. Evidence for an SPS-HLB bacterium in symptomatic leaves was obtained by PCR amplification with universal primers for prokaryotic 16S rRNA gene sequences. The amplified 16S rRNA gene was cloned and sequenced. Sequence analysis and phylogeny studies showed that the 16S rRNA gene possessed the oligonucleotide signatures and the secondary loop structure characteristic of the alpha-Proteobacteria, including the liberibacters. The 16S rRNA gene sequence phylogenetic tree showed that the SPS-HLB bacterium clustered within the a-Proteobacteria, the liberibacters being its closest relatives. For these reasons, the SPS-HLB bacterium is considered a member of the genus 'Ca. Liberibacter'. However, while the 16S rRNA gene sequences of 'Ca. L. asiaticus' and 'Ca. L. africanus' had 98-4% similarity, the 16S rRNA gene sequence of the SPS-HLB liberibacter had only 96(.)0% similarity with the 16S rRNA gene sequences of 'Ca. L. asiaticus'or'Ca. L. africanus'. This lower similarity was reflected in the phylogenetic tree, where the SPS-HLB liberibacter did not cluster within the 'Ca. L asiaticus'/'Ca. L. africanus group', but as a separate branch. Within the genus 'Candidatus Liberibacter' and for a given species, the 16S/23S intergenic region does not vary greatly. The intergenic regions of three strains of 'Ca. L. asiaticus', from India, the People's Republic of China and Japan, were found to have identical or almost identical sequences. In contrast, the intergenic regions of the SPS-HLB liberibacter, 'Ca. L. asiaticus' and 'Ca. L. africanus' had quite different sequences, with similarity between 66(.)0 and 79(.)5%. These results confirm that the SPS-HLB liberibacter is a novel species for which the name 'Candidatus Liberibacter americanus' is proposed. Like the African and the Asian liberibacters, the 'American' liberibacter is restricted to the sieve tubes of the citrus host. The liberibacter could also be detected by PCR amplification of the 16S rRNA gene in Diaphorina citri, the psyllid vector of 'Ca. L. asiaticus', suggesting that this psyllid is also a vector of 'Ca. L. americanus' in SPS. 'Ca. L. americanus' was detected in 216 of 218 symptomatic leaf samples from 47 farms in 35 municipalities, while 'Ca. L. asiaticus' was detected in only 4 of the 218 samples, indicating that 'Ca. L. americanus' is the major cause of HLB in SIPS.en
dc.format.extent1857-1862
dc.language.isoeng
dc.publisherSoc General Microbiology
dc.relation.ispartofInternational Journal of Systematic and Evolutionary Microbiology
dc.sourceWeb of Science
dc.titleCandidatus Liberibacter americanus, associated with citrus huanglongbing (greening disease) in São Paulo State, Brazilen
dc.typeArtigo
dcterms.licensehttp://ijs.sgmjournals.org/site/misc/reprints.xhtml
dcterms.rightsHolderSoc General Microbiology
dc.contributor.institutionINRA
dc.contributor.institutionUniv Victor Segalen Bordeaux 2
dc.contributor.institutionFundecitrus
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.description.affiliationINRA, UMR 1090, F-33883 Villenave Dornon, France
dc.description.affiliationUniv Victor Segalen Bordeaux 2, F-33883 Villenave Dornon, France
dc.description.affiliationFundecitrus, BR-14807040 Araraquara, SP, Brazil
dc.description.affiliationUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.identifier.doi10.1099/ijs.0.63677-0
dc.identifier.wosWOS:000232239600019
dc.rights.accessRightsAcesso restrito
unesp.author.orcid0000-0002-3350-8308[5]
dc.relation.ispartofjcr1.932
dc.relation.ispartofsjr0,943
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