Abstract Detail

Comparative Genomics/Transcriptomics

Kinser, Taliesin [1], Godden, Grant [2], Soltis, Douglas [3], Soltis, Pamela S. [4], Consortium, Mint Evolutionary Genomics [5].

Ancient whole genome duplications as drivers of chemical diversification in Lamiaceae.

The prevalence of polyploidy in angiosperms and its role as a key driver in the diversification of angiosperm species and traits is well documented. It is now known, for example, that all angiosperms have polyploidy in their ancestry. These whole-genome duplications (WGDs) have led to a variety of evolutionary innovations and have sometimes been associated with rapid radiations. Paleopolyploidy (ancient WGDs) has been associated with the proliferation of novel genes and gene interactions in Brassicales, vastly increasing their secondary metabolite diversity. The ability to place past WGDs onto a phylogeny is key to understanding how polyploidy has contributed to species and chemical diversification. Lamiaceae are one of the most species-rich and chemically diverse angiosperm families with a high diversity of iridoids and monoterpenes. Recent work has revealed the importance of gene duplications in the origin and expansion of monoterpenes and iridoids within this clade. As a large and economically important family, Lamiaceae offer an ideal opportunity to investigate how polyploidy contributes to chemical (and species) diversification. Here we use transcriptomes of 48 mint species (and 4 outgroups in Lamiales) to estimate synonymous gene duplicate divergence in each species and to produce gene trees across the phylogeny to test for and place WGDs. We utilize and compare multiple approaches in one of the largest datasets for phylogenomic paleoploid analyses to date. We then apply the placements of ancient WGDs to examine diversification events of monoterpenes and iridoids within the mint phylogeny. This study allows us not only to investigate the prevalence of WGDs within a highly diverse family but also to link them to widespread chemical diversification.

Related Links:
The Mint Genome Project

1 - University Of Florida, Florida Museum Of Natural History, 1659 Museum Road, Dickinson Hall, University Of Florida, Gainesville, FL, 32611, United States
2 - University Of Florida, Florida Museum Of Natural History, Dickinson Hall, PO Box 117800, Gainesville, FL, 32611, United States
3 - Florida Museum of Natural History, University of Florida, 1659 Museum Road, Gainesville, Florida, 32611, United States
4 - University Of Florida, Florida Museum Of Natural History, Gainesville, FL, 32611.0, United States
5 - Michigan State University, Plant Biology, East Lansing, MI, USA

Keywords:
chemical diversification
Polyploidy
Phylogenomics
ancient WGDs
transcriptomics.

Presentation Type: Oral Paper
Session: 21, Comparative Genomics and Transcriptomics I
Location: 102/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 9:30 AM
Number: 21007
Abstract ID:557
Candidate for Awards:Margaret Menzel Award