[-] Show simple item record

dc.contributor.advisorHoltsford, Timothy Philipeng
dc.contributor.authorSoule, Jacob W.eng
dc.date.issued2007eng
dc.date.submitted2007 Springeng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file (viewed on November 6, 2007)eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionThesis (M.A.) University of Missouri-Columbia 2007.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Biological sciences.eng
dc.description.abstractThe evolution of selfing is one the most fascinating and common trends observed in flowering plants. Selfing flowers are often smaller than their outcrossing relatives, with reduced reproductive effort. The selfing species Nicotiana plumbaginifolia (plum) follows this pattern with smaller flowers than its outcrossing sister species N. longiflora (long). This study focuses on a glasshouse grown population descended from a field collected population with three corolla length morphs: long, medium and plum. Morphological characters likely relating to mating system were measured, as well as glasshouse selfing rate. Anther Stigma Distance, a measure of herkogamy, varies between corolla morphs, with long [greater than] 0, medium [almost equal to] 0 and plum ASD negative. Corolla length and anther-stigma distance explained some of the selfing rate variation across the three morphs, but had limited correlation with selfing within morphs. Next, I studied the development of the floral organs in all three morphs. Relative Growth Rates (RGRs) were calculated for eight floral traits. RGR is decreased in plum for all floral organs, while RGRs were the same in long and medium for most organs. Length differences between long and medium result from a shorter period of growth. Medium and plum have different mechanisms resulting in shorter flowers. Medium flowers result from progenesis, while plum flowers are produced through neotony. There is also a decreased herkogamy at anther dehiscence in plum and medium which coincides with greater autogamy. Medium and plum anthers dehisce at the same time, earlier than long, and increase the likelihood of selfing.eng
dc.identifier.merlinb61262821eng
dc.identifier.oclc180765754eng
dc.identifier.urihttps://hdl.handle.net/10355/5001
dc.identifier.urihttps://doi.org/10.32469/10355/5001eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.sourceSubmitted by University of Missouri--Columbia Graduate School.eng
dc.subject.lcshHeterochrony (Biology)eng
dc.subject.lcshNicotiana -- Reproductioneng
dc.subject.lcshNicotiana -- Evolutioneng
dc.subject.lcshSelf-pollinationeng
dc.titleHeterochrony of floral and mating system characters between Nicotiana longiflora and N. plumbaginifoliaeng
dc.typeThesiseng
thesis.degree.disciplineBiological sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.A.eng


Files in this item

[PDF]
[PDF]
[PDF]

This item appears in the following Collection(s)

[-] Show simple item record