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dc.contributor.authorSlotta, Tracey Ann Bodoen_US
dc.date.accessioned2011-08-22T19:02:28Z
dc.date.available2011-08-22T19:02:28Z
dc.date.issued2004-07-01en_US
dc.identifier.otheretd-07052004-222328en_US
dc.identifier.urihttp://hdl.handle.net/10919/11204
dc.description.abstractThe Malacothamnus alliance consists of three genera, Iliamna, Malacothamnus, and Phymosia. The genera are considered taxonomically complex since hybridization freely occurs, polyploidy levels vary, and there is a lack of distinct morphological characters to delineate taxa. Several taxonomic treatments have been prepared for each genus, but relationships within the genera and the relationship of the Malacothamnus alliance to others in the Malvaceae remains unknown. This multifaceted study aimed to (a) examine the monophyly of the Malacothamnus alliance and its position in the Malvaceae, (b) determine the relationships between genera in the alliance, (c) compare variation of nuclear and chloroplast genes in the alliance, (d) prepare revised taxonomic treatments for Iliamna and Malacothamnus, and (e) examine the probability of successful hybridization in Iliamna. The monophyly of the Malacothamnus alliance was not confirmed using DNA sequences of both nuclear and chloroplast regions. In Iliamna, little sequence variation was detected among taxa in the Rocky Mountains; however, the nuclear and chloroplast regions conflicted with regard to the relationships of the western and eastern taxa. An ancestral copy of the chloroplast genome is shared between the two eastern U.S. Iliamna species and Phymosia (Bahamas and Mexico). The nuclear ITS sequences indicated the western U.S. Iliamna species were more closely related to Phymosia and Malacothamnus than to other species in Iliamna. Neither data set provided sufficient variation to resolve relationships of species in Malacothamnus. Genetic variation and the feasibility of hybridization in Iliamna supported the results of the broader phylogenetic studies. Iliamna corei and I. remota are recently derived from I. rivularis. Hybrid offspring of I. corei and I. remota had higher viability and fecundity than did hybrids between crosses of either species and I. rivularis. The Virginia populations of I. corei and I. remota are more genetically similar than either is to Illinois populations of I. remota. However, the species are morphologically distinct and can easily be distinguished from others in the genus. Revised taxonomic treatments for Iliamna and Malacothamnus based on surveys of herbarium material are presented. Taxonomic revisions include the new combinations of Iliamna grandiflora subsp. grandiflora and I. grandiflora supsp. crandallii and the resurrection of Malacothamnus hallii and M. orbiculatus.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.relation.haspartTBSdiss.pdfen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectMalvaceaeen_US
dc.subjectIliamnaen_US
dc.subjectMalacothamnusen_US
dc.subjectPhymosiaen_US
dc.subjectITSen_US
dc.subjecttrnL-Fen_US
dc.subjectrpL16en_US
dc.subjecthybridizationen_US
dc.subjectGBSSI-1en_US
dc.subjectand taxonomic revisionen_US
dc.subjectISSRen_US
dc.titlePhylogenetics of the Malacothamnus alliance (Malvaceae): Assessing the role of hybridization and molecular and morphological variation in species delineationen_US
dc.typeDissertationen_US
dc.contributor.departmentBiologyen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineBiologyen_US
dc.contributor.committeechairPorter, Duncan M.en_US
dc.contributor.committeememberOpell, Brent D.en_US
dc.contributor.committeememberJones, Robert H.en_US
dc.contributor.committeememberWinkel, Brenda S. J.en_US
dc.contributor.committeememberSmall, Randallen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07052004-222328en_US
dc.date.sdate2004-07-05en_US
dc.date.rdate2004-07-15
dc.date.adate2004-07-15en_US


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