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Breeding System and Pollination Ecology of Trientalis borealis (Primulaceae)

Roger C. Anderson and Michael H. Beare
American Journal of Botany
Vol. 70, No. 3 (Mar., 1983), pp. 408-415
Stable URL: http://www.jstor.org/stable/2443249
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Breeding System and Pollination Ecology of Trientalis borealis (Primulaceae)
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Abstract

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 was higher at open sites than at heavily shaded sites and was correlated with fruit set. 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.

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