Willow resistance to a galling insect is driven by a lack of induced susceptibility not an induced defense

摘要: Gall-forming insects need to manipulate host plant’s growth access food resources. Because of this intimate relationship, a hypersensitive response (HR) is thought be an important plant defense mechanism kill the insect before gall formed. Few data exist, however, that unambiguously demonstrate HR causally linked resistance against galling insects. Variation in Salix viminalis midge Dasineura marginemtorquens governed by only few genes. Although considered mechanism, earlier study based on quantitative trait locus (QTL) analysis sets which was expressed, has shown larval mortality related single genomic region does not contain for HR, thus challenging previous suppositions expression HR. The present aims test whether or causes observed variation willow D. marginemtorquens. By increasing number markers interest and reanalyzing QTL, we have enhanced level resolution, so permitting more conclusive than previously been possible. identifies two regions responding attack. Importantly, (measured as neonate mortality) are located different regions, strongly contradicting induced hypothesis. found susceptibility were highly correlated because allele associated with also absence galls. It suggested lack susceptibility, rather defense, explains ‘resistance’ S.