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Abstract Detail


Zhan, Shing H. [1], Otto, Sarah P. [2], Barker, Michael S. [1].

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

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.

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manuscript available as a preprint on bioRxiv

1 - University of Arizona, Ecology & Evolutionary Biology, 1041 E. Lowell Street, Tucson, AZ, 85721, USA
2 - University of British Columbia, Zoology, 6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada

chromosome number

Presentation Type: Poster
Session: P2, Macroevolution Posters
Location: Virtual/Virtual
Date: Tuesday, July 20th, 2021
Time: 5:00 PM(EDT)
Number: P2MC001
Abstract ID:147
Candidate for Awards:None

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