Sherman, Natasha A. , Burke, John M. .
Cross-compatibility and the direction of hybridization in Stephanomeria: insights into the origin of the diploid hybrid species S. diegensis.
Both morphological and allozyme evidence show S. virgata and S. exigua as the parents of S. diegensis, a diploid hybrid species. Here we investigate the hybrid formation of Stephanomeria diegensis based on a crossing analysis and patterns of chloroplast variation. We conducted reciprocal crosses between S. exigua and S. virgata, and our results revealed higher crossability when S. exigua served as the maternal parent. In addition, we used a diagnostic chloroplast restriction polymorphism to investigate the directionality of the initial hybridization event(s) that resulted in the formation of S. diegensis. All individuals of S. diegensis (sampled from across the speciesí range) carried the S. virgata cpDNA haplotype, indicating that initial hybridization event(s) occurred in the more difficult direction (i.e., with S. exigua as the pollen parent and S. virgata as the seed parent).
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1 - University of Georgia, Department of Plant Biology, Miller Plant Sciences, Athens, GA, 30602, USA
2 - University of Georgia, Department of Plant Biology, Miller Plant Sciences Bldg., Athens, Georgia, 30602, USA
asymmetrical crossing barrier.
Presentation Type: Oral Paper:Papers for Topics
Location: Williford A/Hilton
Date: Tuesday, July 10th, 2007
Time: 11:15 AM