Laboratoire de virologie, TA 40/02, 34398 Montpellier Cedex 5
Most plant viruses have developed interactions with other organisms for their transmission. According to the level of interactions with these organisms called vectors, one distinguishes the circulative transmission where viruses are circulating within the body of the vector through cellular membranes, from the non circulative transmission where viruses are adsorbed onto the vectors cuticules. The present review is dealing with circulative transmission of plants viruses focusing on piercing-sucking insect vectors. In most cases, viruses do not replicate in their vectors. Their adaptation to the vector consists to cross barriers and to withstand to the hostile conditions gut, the hemolymph and the salivary glands. However, for some viruses, related to animal viruses, adaptation to vector is higher, since they are able to multiply in their insect.