Submitted to: NCB-ESA North Central Branch Entomological Society of America
Publication Type: Abstract Only
Publication Acceptance Date: 2/15/2009
Publication Date: N/A
Technical Abstract: In susceptible wheat plants, damage from Hessian fly occurs solely during larval feeding and development. Feeding begins with the formation of nutritive tissue (host cells at the feeding site that are redirected to produce a favorable, nutrient-rich environment for the larva). The mechanism by which this nutritive tissue is formed is not clear; however, it is believed that secreted salivary gland proteins (SSGPs) play an important role in the establishment of larval feeding sites by reprogramming host cells in a manner similar to the effector proteins reported for plant pathogens. Additionally, in some cases these SSGPs may also be the products of avirulence genes. A large number of gene families encoding novel SSGPs have been identified from Hessian fly populations in the United States through a salivary gland EST project. Hessian fly collections from Israel are considered to represent the most ancestral population sampled to date and may harbor clues into the wheat-Hessian fly interaction. The goal of the present study was to assess differences and commonalities in the transcripts encoding novel SSGPs in Hessian flies from Israel and the United States. Results indicate greater diversity in transcripts encoding SSGPs in the Israeli population than is present in populations from the United States. Further, some of these divergent SSGPs in the Israeli population fall basal in phylogenetic analyses to clades containing families of SSGPs, suggesting these divergent SSGPs may represent ancestral types.