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• W2130020106 abstract "Abstract Phytoplasmas are plant‐pathogenic Mollicutes transmitted by leafhoppers, planthoppers, and psyllids in a persistent propagative manner. Chrysanthemum yellows phytoplasma (CY) is a member of ‘ Candidatus Phytoplasma asteris’, 16Sr‐IB, and is transmitted by at least three leafhopper species, Macrosteles quadripunctulatus Kirschbaum, Euscelidius variegatus Kirschbaum, and Euscelis incisus Kirschbaum (all Homoptera: Cicadellidae: Deltocephalinae). Although M. quadripunctulatus transmits CY with very high efficiency (near 100%), 25% of E. variegatus repeatedly fail to transmit CY. The aims of this work were to correlate vector ability with different pathogen distribution in the insect body and to investigate the role of midgut and salivary glands as barriers to CY transmission. Euscelidius variegatus individuals acquired CY by feeding on infected plants or by abdominal microinjection of a phytoplasma‐enriched suspension. Insects were individually tested for transmission on daisy seedlings [ Chrysanthemum carinatum Schousboe (Asteraceae)], and thereafter analysed by real‐time polymerase chain reaction (PCR) for CY concentration on whole insects or separately on heads and the rest of the body. Hoppers were classified as early and late transmitters or non‐transmitters, according to the time inoculated plants required for expression of CY symptoms. Similar transmission efficiencies were achieved following feeding or abdominal microinjection, suggesting that salivary glands may be a major barrier to transmission. Following acquisition from infected plants, all transmitters tested positive by PCR, and 60% of non‐transmitters also tested positive although with a significantly lower CY concentration. This indicates that a minimum number of phytoplasma cells may be required for successful transmission. The midgut may have prevented phytoplasma entry into the haemocoel of PCR‐negative non‐transmitters. Results suggest that both midgut and salivary glands may act as barriers. To assess the effect on CY transmission of a specific parasitic bacterium of E. variegatus , tentatively named BEV (Bacterium Euscelidius variegatus ), we established a BEV‐infected population by abdominal microinjection of BEV bacteria. The presence of BEV did not significantly alter the efficiency of CY transmission." @default.
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• W2130020106 date "2009-04-09" @default.
• W2130020106 modified "2023-10-18" @default.
• W2130020106 title "Variation in vector competency depends on chrysanthemum yellows phytoplasma distribution within<i>Euscelidius variegatus</i>" @default.
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• W2130020106 doi "https://doi.org/10.1111/j.1570-7458.2009.00845.x" @default.
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