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Broad variation in rates of polyploidy and dysploidy across flowering plants is correlated with lineage diversification

View ORCID ProfileShing H. Zhan, View ORCID ProfileSarah P. Otto, View ORCID ProfileMichael S. Barker
doi: https://doi.org/10.1101/2021.03.30.436382
Shing H. Zhan
1Department of Zoology & Biodiversity Research Centre, the University of British Columbia, Vancouver, BC, Canada
2Department of Ecology and Evolutionary Biology, the University of Arizona, Tucson, AZ, USA
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  • For correspondence: zhan@zoology.ubc.ca
Sarah P. Otto
1Department of Zoology & Biodiversity Research Centre, the University of British Columbia, Vancouver, BC, Canada
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Michael S. Barker
2Department of Ecology and Evolutionary Biology, the University of Arizona, Tucson, AZ, USA
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ABSTRACT

Changes in chromosome number are considered an important driver of diversification in angiosperms. Single chromosome number changes caused by dysploidy may produce strong reproductive barriers leading to speciation. Polyploidy, or whole genome duplication, yields new species that are often reproductively isolated from progenitors and may exhibit novel morphology or ecology that may further facilitate diversification. Here, we examined the rates of polyploidy, dysploidy, and diversification across the angiosperms. Our analyses of nearly 30,000 taxa representing 46 orders and 147 families found that rates of polyploidy and dysploidy differed by two to three orders of magnitude. The rates of polyploidy and dysploidy were positively correlated with diversification rates, but relative importance analyses indicated that variation in polyploidy was better correlated with diversification rates than dysploidy. Our results provide an overview of angiosperm chromosomal evolution and a roadmap for future research on the complex relationships among polyploidy, dysploidy, and diversification.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted March 31, 2021.
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Broad variation in rates of polyploidy and dysploidy across flowering plants is correlated with lineage diversification
Shing H. Zhan, Sarah P. Otto, Michael S. Barker
bioRxiv 2021.03.30.436382; doi: https://doi.org/10.1101/2021.03.30.436382
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Broad variation in rates of polyploidy and dysploidy across flowering plants is correlated with lineage diversification
Shing H. Zhan, Sarah P. Otto, Michael S. Barker
bioRxiv 2021.03.30.436382; doi: https://doi.org/10.1101/2021.03.30.436382

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