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Dissection of the genetics and mechanisms conferring resistance to Fusarium verticillioides in maize

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dc.contributor.authorMorales, Laura
dc.contributor.chairNelson, Rebecca J.
dc.contributor.committeeMemberBuckler, Edward S.
dc.contributor.committeeMemberBergstrom, Gary Carlton
dc.date.accessioned2018-10-03T19:27:59Z
dc.date.available2018-10-03T19:27:59Z
dc.date.issued2017-12-30
dc.description.abstractMaize, an important food and commodity crop worldwide, can be infected by the fungal pathogen Fusarium verticillioides. F. verticillioides causes the disease Fusarium ear rot (FER) and produces the toxic fungal secondary metabolite (mycotoxin) fumonisin, which can reduce yields and marketability of maize grain. More importantly, fumonisin exposure is associated with health risks for humans and animals. This dissertation aimed to dissect the genetics and mechanisms conferring resistance to FER and fumonisin contamination in maize. Employing point and inundative F. verticillioides inoculation methods with a panel of 50 maize inbred lines, the symptomatology of F. verticillioides infection (FVI) was dissected, showing that kernel bulk density is an accurate predictor of fumonisin contamination in maize kernels. Quantitative trait locus mapping and correlation analyses further demonstrated the link between kernel bulk density and resistance to FVI and revealed the diverse modes of pathogenesis and resistance loci present in four tropical-by-temperate recombinant inbred line maize families. Inter-trait correlation analyses, genome-wide association mapping, and genomic prediction of 29 publicly available disease resistance (including FER) and morphophysiological traits on the maize core diversity panel revealed that height and inflorescence traits were associated and shared loci disease resistance.
dc.identifier.doihttps://doi.org/10.7298/X4P55KP3
dc.identifier.otherMorales_cornellgrad_0058F_10581
dc.identifier.otherhttp://dissertations.umi.com/cornellgrad:10581
dc.identifier.otherbibid: 10474233
dc.identifier.urihttps://hdl.handle.net/1813/59130
dc.language.isoen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectMaize
dc.subjectQuantitative Genetics
dc.subjectGenetics
dc.subjectPlant pathology
dc.subjectDisease resistance
dc.subjectFusarium verticillioides
dc.subjectInoculation methods
dc.subjectMycotoxins
dc.subjectPlant sciences
dc.titleDissection of the genetics and mechanisms conferring resistance to Fusarium verticillioides in maize
dc.typedissertation or thesis
dcterms.licensehttps://hdl.handle.net/1813/59810
thesis.degree.disciplinePlant Breeding
thesis.degree.grantorCornell University
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Plant Breeding

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