Breeding system and pollination ecology of Trientalis borealis (Primulaceae)

TitleBreeding system and pollination ecology of Trientalis borealis (Primulaceae)
Publication TypeJournal Article
Year of Publication1983
AuthorsAnderson RC, Beare MH
JournalAmerican Journal of Botany

Selfing in Trientalis borealis is reduced by spatial separation of stigma and anthers during anther dehiscence and by internal self-incompatibility. Artificial self-pollination resulted in low levels of fruit set (2.0%). Crosses made within patches of plants yielded variable (0-72.7%), but generally low fruit set (x=21.4%). This may be caused by patches often consisting of a single genet. In contrast crosses made among patches resulted in uniformly high levels of fruit set (x=84.3%). Pollinator activity, however, showed no correlation with seed set. We conclude that the primary pollinators, Halictid and Andrenid bees, play an important role in the breeding system of the plant by promoting outcrossing but that availability or efficiency of pollinators may limit seed set.