Vasek, Frank C. , Weng, Vincent , Smith-Huerta, Nancy L. .
Breeding systems of Clarkia (Onagraceae): A partial text for cryptic self-incompatibility and maternal choice in C. unguiculata.
We conducted competitive pollinations to verify the reported occurrence of cryptic self incompatibility (CSI) in Clarkia unguiculata. We utilized recessive maternal (and self pollen donor) plants from a locality near Morro Bay, California, and dominant cross pollen donor plants from 17 localities widespread through the species range in California. Competitive pollinations by 10 of the 17 cross-pollen donor populations yielded progenies that significantly favored out-cross pollen. These results confirm the occurrence of CSI in C. unguiculata. However competitive pollination by 2 of the cross-pollen donor populations, yielded a majority of progenies in which self pollen was favored. These results demonstrate that maternal preference is not restricted to out-cross pollen and suggest levels of CSI may vary between pollen donor population localities. Results of competitive pollinations also varied between maternal plant families. Three of the ten maternal plant families we tested exhibited mostly strong CSI, while the remaining seven maternal plant families showed variation ranging from a strong and significant preference for outcross pollen (CSI) to a strong and significant preference for self pollen. Overall, our results confirm the occurrence of CSI in C. unguiculata, but also suggest extensive individual and geographical variation in the phenomenon.
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1 - University of California, Botany and Plant Sciences, Riverside , CA, 92507, USA
2 - University of California, Botany and Plant Sciences, Riverside, CA, 92707, USA
3 - Miami University, Department of Botany, Oxford, Ohio, 45056, USA
Presentation Type: Poster:Posters for Topics
Location: Event Tent/Cliff Lodge
Date: Monday, July 27th, 2009
Time: 5:30 PM