title: Assessment of the diagnostic potential of Immmunocapture-PCR and Immuno-PCR for Citrus Variegated Chlorosis.
abstract: Xylella fastidiosa causes significant losses in many economically important crops. An efficient pathogen detection system is critical for epidemiology studies, particularly when large sample size is involved. In this study we report the development of immunomolecular assays like Immmunocapture-PCR and Immuno-PCR for direct detection of X. fastidiosa without DNA isolation. Whereas the reactivity of ELISA and PCR ranged from 10(6) to 10(4) bacterial cells, the IC-PCR sensitivity was up to 10(3) and the detection limit of I-PCR was up to 10(1) bacterial cells. These methods can use either plant sample extracts or cultivated media, and show no cross reaction for any other endophytic citrus-bacteria. Therefore, IC-PCR and I-PCR assays provide an alternative for quick and very sensitive methods to screening X. fastidiosa, with the advantage of not requiring any concentration or DNA purification steps while still allowing an accurate diagnosis of CVC.
authors.affiliation: Departamento de Microbiologia e Imunologia, Universidade Estadual de Campinas (UNICAMP), Caixa Postal 6109, 13083-970, Campinas, SP, Brazil.
authors.forename: Luís Antonio
authors.initials: LA
authors.lastname: Peroni
authors.forename: José Raimundo Ribeiro Dos
authors.initials: JR
authors.lastname: Reis
authors.forename: Helvécio Della
authors.initials: HD
authors.lastname: Coletta-Filho
authors.forename: Alessandra Alves
authors.initials: AA
authors.lastname: de Souza
authors.forename: Marcos Antonio
authors.initials: MA
authors.lastname: Machado
authors.forename: Dagmar Ruth
authors.initials: DR
authors.lastname: Stach-Machado
mesh_terms: D000907:Antibodies, Bacterial / Q000276:immunology*; D032084:Citrus sinensis / Q000382:microbiology*; D003470:Culture Media; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D010935:Plant Diseases / Q000382:microbiology*; D018515:Plant Leaves / Q000382:microbiology; D016133:Polymerase Chain Reaction / Q000379:methods*; D012680:Sensitivity and Specificity; D044167:Xylella / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification*
chemical_list: D000907:Antibodies, Bacterial; D003470:Culture Media