Seasonal Variation of 'Candidatus Liberibacter asiaticus' Titers in New Shoots of Citrus in Distinct Environments

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dc.contributor.authorLopes, Silvio A.
dc.contributor.authorLuiz, Fernanda Q. B. F.
dc.contributor.authorOliveira, Hermes T.
dc.contributor.authorCifuentes-Arenas, Juan C. [UNESP]
dc.contributor.authorRaiol-Junior, Laudecir L. [UNESP]
dc.contributor.institutionFundecitrus
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-11-26T15:43:53Z
dc.date.available2018-11-26T15:43:53Z
dc.date.issued2017-04-01
dc.description.abstractThe major citrus area of Brazil occupies near 450,000 ha between the Triangulo Mineiro (TM) region of Minas Gerais State and the south of Sao Paulo State (SPS). Significant climatic variation occurs between regions which could affect huanglongbing (HLB) progress, which is lower in TM. To investigate this possibility, young sweet orange shoots were sampled periodically over 2 years to determine 'Candidatus Liberibacter asiaticus' titers in naturally infected trees in orchards in Analandia, central SPS, and Frutal and Comendador Gomes, within TM. Data-loggers recorded local temperature and relative humidity hourly. In the laboratory, five 'Ca. L. asiaticus'-free Diaphorina citri adults were placed on each sampled shoot for 48 h to feed and acquire the pathogen. Shoots and insects were individually analyzed by quantitative polymerase chain reaction to determine 'Ca. L. asiaticus' titers. The incidence of 'Ca. L. asiaticus'-positive shoots, 'Ca. L. asiaticus' titers, and acquisition rates were lower for shoots from Comendador Gomes than those from Frutal or Analandia Stronger association was observed between 'Ca. L. asiaticus' titers and the number of hours below 15 degrees C (h < 15 degrees C) or above 30 degrees C (h > 30 degrees C), and cumulative rainfall registered during the 15 days prior to sampling of shoots on each occasion. 'Ca. L. asiaticus' titers associated positively with h < 15 degrees C and rainfall and negatively with h > 30 degrees C. The slower spread and lower incidence of HLB in TM may be related to lower incidences of 'Ca. L. asiaticus'-positive young shoots and lower titers of 'Ca. L. asiaticus' in the same shoots as a consequence of the warmer and drier conditions.en
dc.description.affiliationFundecitrus, BR-1480700 Araraquara, SP, Brazil
dc.description.affiliationUniv Estad Paulista, Jaboticabal, SP, Brazil
dc.description.affiliationUnespUniv Estad Paulista, Jaboticabal, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2014/ 12534-2
dc.format.extent583-590
dc.identifierhttp://dx.doi.org/10.1094/PDIS-06-16-0859-RE
dc.identifier.citationPlant Disease. St Paul: Amer Phytopathological Soc, v. 101, n. 4, p. 583-590, 2017.
dc.identifier.doi10.1094/PDIS-06-16-0859-RE
dc.identifier.issn0191-2917
dc.identifier.urihttp://hdl.handle.net/11449/159459
dc.identifier.wosWOS:000397363800009
dc.language.isoeng
dc.publisherAmer Phytopathological Soc
dc.relation.ispartofPlant Disease
dc.relation.ispartofsjr0,575
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleSeasonal Variation of 'Candidatus Liberibacter asiaticus' Titers in New Shoots of Citrus in Distinct Environmentsen
dc.typeArtigo
dcterms.rightsHolderAmer Phytopathological Soc

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