Abstract Detail

Population Genetics/Genomics

Gaynor, Michelle [1], Soltis, Douglas [2], Soltis, Pamela [3], Ponciano, Jose Miguel [4].

Modeling the dynamics of multiple origins and gene flow in autopolyploids and their diploid progenitors.

Polyploidy, or whole-genome duplication (WGD), is a major evolutionary force with dramatic ecological and evolutionary repercussions. Multiple origins are known to be common in both allo- and autopolyploid species, with a range of demographic and genetic consequences. For example, multiple origins may facilitate the establishment of polyploid lineages by aiding in the escape from minority cytotype exclusion: as the number of origins increases, especially on a local scale, the number of possible polyploid mates increases, reducing the likelihood that a polyploid will mate with a neighboring diploid and increasing its chance of establishment. Detecting decreased gene flow and recurrent origins is currently not possible in mixed ploidy populations; therefore, despite the theoretical importance of these mechanisms to escape minority cytotype exclusion, we are unable to empirically test this hypothesis in naturally occurring populations. In population genetic studies, the frequency of alleles from multiple origins are often estimated through clustering approaches that cannot differentiate alleles that are identical by descent due to primary versus secondary contact (i.e. origin or gene flow). To test the ability of different estimation methods to differentiate between these histories, we simulated populations of diploids and their autopolyploid derivatives with varying frequencies of polyploid formation and levels of gene flow to determine the potential demographic history of each origin. This effort builds upon previous models of establishment that have received attention recently and that have their roots in a monograph by Fisher in 1947. Our work is a novel approach to modeling dynamics between autopolyploids and their diploid progenitors.

1 - University of Florida, Florida Museum Of Natural History, 220 Bartram Hall, P.O. Box 118525, Gainesville, FL, 32611, United States
2 - University Of Florida, Florida Museum Of Natural History, Dickinson Hall, Gainesville, FL, 32611, United States
3 - University Of Florida, Florida Museum Of Natural History, PO Box 117800, Gainesville, FL, 32611, United States
4 - University of Florida, Department of Biology, P.O. Box 118525, Gainesville, FL, 32611, USA

Keywords:
polyploidy
Autopolyploidy.

Presentation Type: Oral Paper
Session: PGG4, Population Genetics and Genomics IV
Location: /
Date: Wednesday, July 21st, 2021
Time: 3:30 PM(EDT)
Number: PGG4003
Abstract ID:576
Candidate for Awards:Margaret Menzel Award