The genus Symphyotrichum (Asteraceae) contains species that are found throughout North America. Over forty-seven species occur in Missouri (Steyermark et al., 2006). Symphyotrichum pilosum is among the most widespread and weediest of our native asters while S. parviceps is less common and mainly occurs as scattered populations in the eastern half of the state. The purpose of this study is to identify an unknown Symphyotrichum species found in a glade near Steelville, MO. It has been argued that the aster is a hexaploid variant of S. parviceps, another cytotype of S. pilosum or a new unknown species. However, the base chromosome number for Symphyotrichum is nine and has been reduced to eight. The unique Aster’s chromosome counts have revealed that the aster is a dodecaploid (2n=96=12X). This number is larger than all known chromosome numbers for S. pilosum (n=16, 20,24) and S. parviceps (n= 16,24,32) in the state of Missouri. Internal Transcribed Spacer sequence data was not able to resolve relationships among these taxa. Microsatellite markers are currently being developed to determine the relationships among these taxa.
|Advisor:||Esselman, Elizabeth J.|
|Commitee:||Barry, Kelly, Fowler, Tom|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 55/02M(E), Masters Abstracts International|
|Subjects:||Plant biology, Plant sciences|
|Keywords:||Asteraceae, Chromosome count, Molecular phylogeny, Symphotrichum|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be