Influence of endophyte genotype on swainsonine concentrations in Oxytropis sericea

► Swainsonine concentrations differ between Oxytropis sericea populations in the field. ► Swainsonine differs between plant populations grown in a common garden. ► Swainsonine differs between endophyte isolates grown in a common garden. ► Endophyte genotype is the primary factor influencing swainsonine concentrations.