A recent survey on the microflora associated with the leafhopper Scaphoideus titanus Ball (Hemiptera Cicadellidae), the vector of
“flavescence dorée” (FD), showed the presence of bacteria belonging to the genus Asaia. These bacteria are symbionts of insects
of the genus Anopheles, malarial mosquito vectors. We focused on the association between Asaia sp. and S. titanus with the aim
to evaluate a possible role of this microorganism as a symbiotic control agent. After development of artificial feeding systems for
S. titanus, quantitative PCR on insects or feeds DNA was performed with specific primers. Results underlined that Asaia sp. was
dominant in the insect microflora. A strain of Asaia expressing a green fluorescent protein was used to perform recolonization of
the body of S. titanus, showing the colonization by the bacterium of salivary glands, guts, female and male reproductive organs of
the insect. In situ hybridization with specific probes was performed on insect dissections, confirming the presence of the bacterium
in spermatic bundles and in Malpighian tubules. Easy cultivability, dominance within the bacterial population in the insect
body, cryogenic preservability and easiness for genetic manipulation demonstrated by the overall data make Asaia sp. an optimal
candidate for carrying factors for FD control.
|Numero di pagine||2|
|Rivista||Bulletin of Insectology|
|Stato di pubblicazione||Pubblicato - 2008|
- Scaphoideus titanus, “flavescence dorée” Phytoplasma, Asaia, symbiotic control, Anopheles.