Abstract Detail

Population Genetics/Genomics

Wessinger, Carolyn [1], Kelly, John [2], Hileman, Lena [3].

The genomic basis of pollination syndrome divergence: insights from the Penstemon virgatus species complex.

In the genus Penstemon, flowers adapted to hummingbird pollination have repeatedly evolved (at least 12 times) from flowers adapted to pollination by bees (and wasps) on a relatively short evolutionary timescale. This transition involves the evolution of narrow red flowers that produce large amounts of nectar. Such a widespread pattern of repeated evolution makes Penstemon an ideal system to understand population genetic processes that contribute to repeated evolution in related organisms. Here we examine patterns of genome-wide genetic variation in a trio of closely-related and geographically overlapping Penstemon taxa that capture both bee and hummingbird pollination syndromes.  
We sampled eight individuals from each of four populations of P. virgatus var. asa-grayi (bee syndrome), three populations of P. neomexicanus(bee syndrome), and five populations of P. barbatus (hummingbird syndrome). These species have partially overlapping distributions in New Mexico and Colorado. We generated genome-wide SNP markers using shallow genome sequence data and cataloged patterns of polymorphism. We assessed the degree to which genomic variation is partitioned by population, by named taxon, and by pollination syndrome. We contrasted the pattern of polymorphism in genomic regions known to underlie floral divergence between P. barbatus vs. P. neomexicanus to the pattern of polymorphism in the rest of the genome. We discuss the patterns of genomic divergence in the context of transitions to hummingbird pollination.

1 - University Of Kansas, EEB, 1200 Sunnyside Avenue, Lawrence, KS, 66045, United States
2 - University of Kansas, EEB, 1200 Sunnyside Ave, Lawrence, KS, 66045, USA
3 - University Of Kansas, Ecology And Evolutionary Biology, 1200 Sunnyside Avenue, Lawrence, KS, 66045, United States

pollination syndrome
multiplexed shotgun genotyping

Presentation Type: Oral Paper
Number: 0002
Abstract ID:449
Candidate for Awards:None

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