ZAREI, Zahra; SALEHI, Mohammad; AZAMI, Zabihallah; SALARI, Khadijeh; BEVEN, Laure

doi:10.1007/s00284-016-1180-z

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ZAREI, Zahra
Department of Crop Protection

SALEHI, Mohammad
Plant Protection Research Department

AZAMI, Zabihallah
Plant Protection Research Department

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Ce document a été publié dans

Current Microbiology. 2017, vol. 74, n° 2, p. 239-246

Springer Verlag

Résumé en anglais

Spiroplasma citri is a bacterial pathogen responsible for the economically important citrus stubborn disease. Sesame and citrus seeds serve as hosts for both S. citri and its leafhopper vector Circulifer haematoceps. To evaluate whether sesame could act as a reservoir for citrus-infecting strains or not, the genetic diversity among S. citri strains found in leafhoppers collected in citrus and citrus-free sesame fields was investigated. Among 26 periwinkle plants exposed to the collected C. haematoceps leafhoppers, 12 plants developed typical stubborn symptoms. All symptomatic periwinkles were polymerase chain reaction positive using S. citri-specific primer pairs targeting the spiralin and P89 genes. Phylogenetic trees based on spiralin gene sequence analysis indicated that the novel field-collected strains clustered with those belonging to two formerly defined S. citri groups (groups 6 and 1). In addition, our results strongly suggest that group 1 strains could be transmitted from sesame-infected plants to citrus trees by C. haematoceps, while group 6 strains may not infect citrus trees.< Réduire

Mots clés

stubborn des agrumes

pathologie végétale

diversité génétique

santé des plantes

bactérie phytopathogène

mollicute phytopathogène

spiroplasma citri

spiroplasme

circulifer haematoceps

insecte vecteur

transmission des maladies

agrume

sesame

iran

Mots clés en anglais

genêtic variation

plant health

phytopathogenic bacteria

insect vectors

citrus fruit