Abstract Detail

Comparative Genomics/Transcriptomics

Li, Zheng [1], Barker, Michael [2].

Ancient genome duplication, gene loss, and diploidization of land plants.

Polyploidy, or whole genome duplication (WGD), is considered one of the most important forces in vascular plant evolution. Previous genomic analyses indicate that flowering plant genomes are highly dynamic and experienced repeated rounds of ancient WGDs followed by diploidization. Despite the prevalence of WGDs across the vascular plant phylogeny, we know relatively little about the processes and mechanisms of diploidization, especially outside of the flowering plants. To further investigate some elements of diploidization across the diversity of land plants, we analyzed patterns of gene retention and loss across a thousand transcriptomes from the 1KP project. Our analyses uncovered evidence for that rates of gene loss following WGD are better explained by variation among phylogenetically related lineages rather than simply with time since a WGD. These results suggest that understanding diploidization in plants will require evaluating data from phylogenetically diverse lineages. Combining our recent findings on patterns of chromosome loss in vascular plants, these results enhance our understanding of the mode and tempo of land plant genome evolution.

1 - University Of Arizona, Department Of Ecology And Evolutionary Biology, P.O. Box 210088, Tucson, AZ, 85721, United States
2 - University of Arizona, Department Of Ecology & Evolutionary Biology,, P.O. Box 210088, Tucson, AZ, 85721, United States

Keywords:
polyploidy
Whole-genome duplication
diploidization
paleopolyploidy.

Presentation Type: Oral Paper
Session: CG2, Functional & Comparative Genetics/Genomics II
Location: Virtual/Virtual
Date: Wednesday, July 29th, 2020
Time: 4:15 PM
Number: CG2006
Abstract ID:488
Candidate for Awards:Margaret Menzel Award