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dc.contributor.advisorDlugosch, Katrina M.
dc.contributor.authorCarpenter, Elizabeth Marjorie
dc.creatorCarpenter, Elizabeth Marjorie
dc.date.accessioned2019-09-17T02:02:36Z
dc.date.available2019-09-17T02:02:36Z
dc.date.issued2019
dc.identifier.urihttp://hdl.handle.net/10150/634305
dc.description.abstractAn important question in invasion ecology is why certain introduced species become invasive. It is thought that some invasive plants escape their natural enemies, and therefore might adapt to devote more resources to growth under a general trade-off between growth and defense. Yellow starthistle (Centaurea solstitialis) has previously been shown to grow larger in its invaded range. This study sought to test whether yellow starthistle is evolving differences in immune activity along a growth-defense trade-off or through local adaptation to its pathogen communities. This study used a high-throughput peroxidase assay to quantify immune activity after leaves were exposed to bacteria from native and invaded ranges. Immune activity was measured using the light absorbance of a substrate for peroxidase enzymes. Plant genotypes from the invaded range showed a lower immune response when exposed to bacteria from all ranges. Three bacteria strains from the invaded range elicited a lower immune response when exposed to plant genotypes from both ranges. These results support the hypothesis that yellow starthistle is evolving to invest less in defense, and future work should investigate the connections between these changes and investment in growth.
dc.language.isoen
dc.publisherThe University of Arizona.
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
dc.subjectEcology
dc.subjectGrowth-Defense Trade-off
dc.subjectImmunity
dc.subjectInvasive Species
dc.subjectMicrobiology
dc.subjectYellow starthistle
dc.titleEvidence for a Growth-Defense Trade-off in Centaurea solstitialis
dc.typetext
dc.typeElectronic Thesis
thesis.degree.grantorUniversity of Arizona
thesis.degree.levelmasters
dc.contributor.committeememberGallery, Rachel E.
dc.contributor.committeememberHunter, Martha S.
thesis.degree.disciplineGraduate College
thesis.degree.disciplineEcology & Evolutionary Biology
thesis.degree.nameM.S.
refterms.dateFOA2019-09-17T02:02:36Z


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