Variation of compounds in leaves of susceptible and resistant alternate hosts of Cronartium pini and C. ribicola

Abstract Leaf compounds may contribute to plant defense against Cronartium rusts. Secondary are either natural or induced in leaves. We studied the variation of leaves six alternate hosts pini and two C. ribicola that represented susceptible resistant species these Extracts from were analyzed using LC-MSMS (liquid chromatography tandem mass spectrometry) compared between same genera identify significant differences species. Also, LC–MS with external calibration was used quantify 12 candidate known literature. Among compounds, most abundant ones -resistant Melampyrum pratense chlorogenic acid quercitrin, Veronica chamaedrys ferulic acid, quercitrin luteolin Impatiens glandulifera kaempferol, rutin hyperoside. In Ribes rubrum caffeic p-coumaric quercitrin. all extracted leaf concentrations three over 1000 times greater rust-resistant M. , V. eight I. one compound R. than rust-susceptible promising possibly linked rust resistance