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- Title
Breeding system and inbreeding depression in the rare orchid, Platanthera praeclara, in a fragmented grassland landscape.
- Authors
Travers, Steven E.; Anderson, Kirk; Vitt, Pati; Harris, Marion O.
- Abstract
An important consequence of self-compatibility in plants is that self-pollination can have deleterious effects on plant fitness because of inbreeding. We conducted a hand pollination experiment under field conditions to measure the magnitude of inbreeding depression associated with self-pollination in the rare western prairie fringed-orchid Platanthera praeclara Sheviak and Bowles. By comparing capsules and seeds resulting from cross versus self-pollination treatments, we determined that self-pollination reduces seed quality while having no detectable effect on capsule production or seed numbers. A smaller percentage of seeds resulting from self-pollination contained an embryo (18%) relative to seeds from cross-pollination (46%). Seeds that had an embryo were scored for the size of the embryo, small or large. A smaller proportion of seeds from self-pollination contained a large embryo (75%) relative to seeds from cross-pollination (92%). These results suggest that sexual reproduction and recruitment in this rare plant are dependent on the frequency of pollinator visitations that result in outcrossing.
- Subjects
WESTERN prairie fringed orchid; LANDSCAPES; ECOLOGY; GRASSLANDS; POLLINATION; PLANT fertilization
- Publication
Botany, 2018, Vol 96, Issue 3, p151
- ISSN
1916-2790
- Publication type
Article
- DOI
10.1139/cjb-2017-0104