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Initiating a plant herbivory response increases impact of fungal pathogens on a clonal thistle

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dc.contributor.authorClark, Amy LaVonne, author
dc.contributor.authorJahn, Courtney, advisor
dc.contributor.authorNorton, Andrew, advisor
dc.contributor.authorDavis, Seth, committee member
dc.date.accessioned2020-01-13T16:41:45Z
dc.date.available2022-01-07T16:41:53Z
dc.date.issued2019
dc.description.abstractCirsium arvense, or Canada thistle, is one of the most detrimental weeds for agricultural production and rangeland health. The autecious fungus, Puccinia punctiformis, or CT‐rust, shows potential as a control agent but rarely reaches epidemic proportions in natural populations. Manipulating plant defense hormones could alter host susceptibility and allow CT-rust to have more widespread impact. To determine if applying hormones increases the infection by the fungal pathogen, Canada thistle plants were inoculated and sprayed with jasmonic acid (JA) and salicylic acid (SA). Results show that the addition of JA at the time of inoculation increases the infection rates, both the incidence and severity, and impact of CT-rust which could make it a more effective control agent for Canada thistle. In the first greenhouse experiment, I found that JA increased infection rates by nearly 20 %. Infection consistently reduced root biomass and this reduction was 45 % greater with the addition of JA compared to water. We also found that, while JA does have a slight effect on plant growth, applying herbivory defense hormones does augment CT-rust's action as a biological control.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierClark_colostate_0053N_15760.pdf
dc.identifier.urihttps://hdl.handle.net/10217/199788
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectinteractive effects
dc.subjectweed management
dc.subjectpathogen
dc.subjecthost-plant resistance
dc.titleInitiating a plant herbivory response increases impact of fungal pathogens on a clonal thistle
dc.typeText
dcterms.embargo.expires2022-01-07
dcterms.embargo.terms2022-01-07
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineBioagricultural Sciences and Pest Management
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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