A taxonomic and evolutionary study of Aster section Biotia
Lamboy, Warren Frank
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/22105
Description
Title
A taxonomic and evolutionary study of Aster section Biotia
Author(s)
Lamboy, Warren Frank
Issue Date
1990
Doctoral Committee Chair(s)
Jones, A.
Department of Study
Plant Biology
Discipline
Plant Biology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Botany
Language
eng
Abstract
In this dissertation I present the correct author citation for the combination Aster section Biotia, provide a disposition for all the names, and list all the known types of names attributed to taxa belonging in the section. In addition, I show that although historically over eighty species have been recognized in Aster section Biotia, the data support the acceptance of only seven species. One of these was the new species A. jonesiae, a Piedmont endemic of Alabama and Georgia, which I discovered and named during the course of my research.
By statistical analyses, I show that Aster glomeratus is conspecific with A. schreberi, that A. commixtus is conspecific with A. spectabilis, and that A. mirabilis and A. jonesiae are distinct species. I present the first application of disjoint principal component analysis to vascular plant systematics in the examination of the status of A. commixtus, and I further demonstrate the use of the method in showing that A. chlorolepis is a good species and is almost certainly an autotetraploid derivative of A. divaricatus.
Also in this thesis I introduce the new concept of retrogressive polyploidy, and I suggest that the hexaploids in Aster section Biotia arose from diploid and octoploid ancestors by this process of hybrid speciation.
By means of isozyme and cladistic analyses I attempt to reconstruct the phylogeny of Aster section Biotia. From the analysis of isozyme data I find that A. mirabilis and A. jonesiae are genetically very similar, that A. divaricatus, A. chlorolepis, A. schreberi, and A. macrophyllus are closely related, and that A. furcatus is relatively distantly related to the other members of the group. Finally, using cladistic methods I show that A. divaricatus is likely to lie at or near the root of the phylogeny of Aster section Biotia and that section Biotia is probably not a monophyletic group.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
