The Aphid Salivary Gland Basal Lamina as a Selective Barrier Associated with Vector-Specific Transmission of Barley Yellow Dwarf Luteoviruses

Abstract

The inability of virions of the MAV barley yellow dwarf luteovirus to penetrate the extracellular basal lamina surrounding the accessory salivary glands of some nonvector aphid species suggests that the basal lamina may possess a selective function that regulates vector-specific luteovirus transmission. When Sitobion avenae and Rhopalosiphum padi were fed for 2 wk of either MAV- or RPV-infected oats and then examined by electron microscopy, virions of both the transmitted MAV and the nontransmitted RPV were observed penetrating the salivary basal lamina of S. avenae [...]