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Polyploidy Inference Across Time Scales in the Charismatic Carnivorous Plant Genus Drosera L. (Droseraceae, Caryophyllales).

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Polyploidy Inference Across Time Scales in the Charismatic Carnivorous Plant Genus Drosera L. (Droseraceae, Caryophyllales)./
Author:	Mohn, Rebekah Anne.
Description:	1 online resource (105 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
Contained By:	Dissertations Abstracts International85-01B.
Subject:	Botany. -
Online resource:	click for full text (PQDT)
ISBN:	9798379945008

Polyploidy Inference Across Time Scales in the Charismatic Carnivorous Plant Genus Drosera L. (Droseraceae, Caryophyllales).
Mohn, Rebekah Anne.

Polyploidy Inference Across Time Scales in the Charismatic Carnivorous Plant Genus Drosera L. (Droseraceae, Caryophyllales). - 1 online resource (105 pages)

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

Thesis (Ph.D.)--University of Minnesota, 2023.

Includes bibliographical references

Chromosome number change is a driver of speciation in eukaryotic organisms. Carnivorous sundews, the plant genus Drosera L., exhibit single chromosome number variation among and within species, especially in the Australian Drosera subg. Ergaleium D.C., potentially linked to the presence of holocentromeres. We critically reviewed literature on chromosome counts in Drosera, verified the taxonomy and count quality, and reconstructed chronograms to test alternate models where the chromosome number gain, loss, and doubling rates (+1, −1, x2) were the same or different between D. subg. Ergaleium and the other subgenera. The best model for chromosome evolution had equal rates of polyploidy (0.013 per million years; Myr) but higher rates of single chromosome number gain (0.13 and 0.021 per Myr) and loss (0.14 and 0.00040 per Myr) in D. subg. Ergaleium compared to the other subgenera. We found no evidence for differences in single chromosome evolution to be associated with differences in diploidization after polyploidy, self-compatibility, or to holocentric chromosomes as had been previously proposed. This study highlights the complexity of factors influencing rates of chromosome number evolution.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379945008Subjects--Topical Terms:

599558
Botany.
Subjects--Index Terms:

Chromosome evolutionIndex Terms--Genre/Form:

554714
Electronic books.

Polyploidy Inference Across Time Scales in the Charismatic Carnivorous Plant Genus Drosera L. (Droseraceae, Caryophyllales).
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245 1 0 $a Polyploidy Inference Across Time Scales in the Charismatic Carnivorous Plant Genus Drosera L. (Droseraceae, Caryophyllales).
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500 $a Advisor: Yang, Ya.
502 $a Thesis (Ph.D.)--University of Minnesota, 2023.
504 $a Includes bibliographical references
520 $a Chromosome number change is a driver of speciation in eukaryotic organisms. Carnivorous sundews, the plant genus Drosera L., exhibit single chromosome number variation among and within species, especially in the Australian Drosera subg. Ergaleium D.C., potentially linked to the presence of holocentromeres. We critically reviewed literature on chromosome counts in Drosera, verified the taxonomy and count quality, and reconstructed chronograms to test alternate models where the chromosome number gain, loss, and doubling rates (+1, −1, x2) were the same or different between D. subg. Ergaleium and the other subgenera. The best model for chromosome evolution had equal rates of polyploidy (0.013 per million years; Myr) but higher rates of single chromosome number gain (0.13 and 0.021 per Myr) and loss (0.14 and 0.00040 per Myr) in D. subg. Ergaleium compared to the other subgenera. We found no evidence for differences in single chromosome evolution to be associated with differences in diploidization after polyploidy, self-compatibility, or to holocentric chromosomes as had been previously proposed. This study highlights the complexity of factors influencing rates of chromosome number evolution.
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