Theiss, Kathryn , Evans, Margaret E. K. , Holsinger, Kent E. .
The relationship between breeding system and life-history in Oenothera sections Anogra and Kleinia (Onagraceae).
We examined the relationship between life-history and breeding systems in a clade of evening primroses (Oenothera, Onagraceae). Self-incompatibility is expected in perennial taxa where individuals may reproduce several times during their life (polycarpy), while self-compatibility is expected in annual taxa where individuals reproduce only once (monocarpy). A lack of pollinators or intraspecific neighbors need not spell reproductive failure for plants that are self-compatible. Tests of the predicted correlation between life-history and breeding system that include complete taxon sampling in a monophyletic group with diverse life histories and reproductive systems are rare. Breeding systems for 9 taxa in the clade consisting of Oenothera sections Anogra (17 taxa) and Kleinia (2 taxa) have been previously reported. We grew wild collected seeds of the remaining 10 taxa in the greenhouse and performed hand pollinations to determine self-compatibility. We used a linear mixed effects model to evaluate the influence of maternal and paternal parents on reproductive success, while statistically controlling for population effects. Contrary to expectation, both of the annual species that we examined (O. engelmannii (sect. Anogra) and O. albicaulis (sect. Kleinia)) are self-incompatible, and two of the perennial species (O. neomexicana (sect. Anogra) and O. coronopifolia (sect. Kleinia)) are self-compatible. Two additional perennial species, O. pallida ssp. pallida and O. californica spp. californica (sect. Anogra), are polymorphic in breeding system. We discuss possible explanations for the poor correlation between reproductive life span and breeding system in this group.
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1 - University of Connecticut, Ecology & Evolutionary Biology, Storrs, Connecticut, 06269-3043, United States of America
2 - Yale University, Ecology & Evolutionary Biology, P. O. Box 208106, 165 Prospect Street, New Haven, Connecticut, 06520-8106, United States of America
3 - University of Connecticut, Ecology & Evolutionary Biology, 75 North Eagleville Road, U-3043, Storrs, Connecticut, 062693043, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Lake Ontario/Hilton
Date: Tuesday, July 10th, 2007
Time: 9:15 AM