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Abstract Detail

Chromosome and Karyotype Evolution in Plants

Mohn, Rebekah [1], Yang, Ya [2].

Integrating Bayesian models and phylogenomic data to explore chromosome evolution in Drosera (Droseraceae).

Across angiosperms chromosome number ancestral state reconstructions and phylogenomic analyses have separately been used to identify whole genome duplications and, in the case of ancestral state reconstructions, to explore single chromosome number changes. We explored chromosome evolution rates with BiChrom to test previous hypotheses and evaluated the presence of whole genome duplications using both BiChrom and phylogenomic methods in the genus Drosera to compare results. With ~250 named species and four subgenera, Drosera has one specious subgenus (D. subg. Ergaleium) reported to have large amounts of chromosome variation and the other specious subgenus (D. subg. Drosera) reported to have stable ploidy shifts. Our dataset consists of chromosome counts and rbcL sequences for 60 species representing all 15 sections of the Drosera. The phylogenomic analyses focused on D. subg. Drosera but include species from three subgenera and seven sections. We found a significantly higher rate of single chromosome decrease in Drosera subg. Ergaleium and moderately higher rates of single chromosome increase compared to the other subgenera. Preliminary results suggest that while the ancestral state reconstruction and phylogenomic methods agree, they provide different types of information that together provide a much richer picture of how the polyploid event occurred.

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1 - University of Minnesota, Department of Plant and Microbial Biology, 1445 Gortner Avenue, St. Paul, MN, 55108, USA
2 - University Of Minnesota, Plant And Microbial Biology, 1445 Gortner Avenue, St. Paul, MN, 55108, United States


Presentation Type: Colloquium Presentations
Session: C11, Chromosome and Karyotype Evolution in Plants
Location: /
Date: Friday, July 23rd, 2021
Time: 10:45 AM(EDT)
Number: C11004
Abstract ID:431
Candidate for Awards:None

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