Methods - We studied the mechanisms and costs of delayed self-pollination in the mixed-mating vine Dalechampia scandens (Euphorbiaceae) by first assessing among-population variation in herkogamy and dichogamy, which together determine the rate and timing of autonomous self-pollination. We then tested whether floral longevity responds plastically to delayed pollination. Finally, we assessed the costs of delayed self-pollination in terms of seed number and size, explicitly separating inbreeding depression from effects of floral senescence.
Key results - Herkogamy varied extensively, while variation in dichogamy was more limited. Unpollinated blossoms increased their longevity, but seed quantity and quality decreased with increasing delays in pollination, independently of inbreeding depression.
Conclusions - In Dalechampia scandens, earlier autonomous selfing is facilitated by reduced herkogamy rather than reduced protogyny, providing reproductive assurance while maintaining the possibility for outcrossing events. Effective early autonomous self-pollination may evolve under reduced cross-pollination reliability in response to costs associated with floral senescence.
- Dalechampia scandens
- pollinator decline
- pollination reliability
- plant fitness
- mating system
- inbreeding depression
- flower longevity
- floral ontogeny
- delayed self-pollination
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Hildesheim, L. (Creator), Opedal, Ø. H. (Creator), Armbruster, S. (Creator) & Pélabon, C. (Creator), Oxford University Press, 23 Aug 2019