ibclogo XVI International Botanical Congess


Abstract Number: 3743
Poster No. = 811


THE REPRODUCTIVE CONSEQUENCES OF AUTOGAMOUS, HETEROSPECIFIC, AND MIXED AUTOGAMOUS/HETEROSPECIFIC POLLINATIONS ON PHLOX CUSPIDATA AND PHLOX DRUMMONDII


M. Brooke Byerley and Damon E. Waitt, Southwestern University, Georgetown, Texas 78627


The outcome of autogamous, heterospecific, and mixed autogamous/heterospecific pollinations on fruit set, seed set, and seed weight were studied in sympatric populations of Phlox cuspidata and Phlox drummondii. There was a significant species effect on these variables with P. cuspidata exhibiting higher fruit set and seed set but lower seed weight. A significant effect of pollen source (autogamous or heterospecifc) was detected for fruit set and seed set but not seed weight. On average heterospecific pollinations yielded higher fruit set and more seeds per fruit than autogamous pollinations even though P. cuspidata exhibits a high level of autogamy. Progeny tests to determine the outcome of mixed autogamous/heterospecific pollen loads are underway.


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