Effects of environment and planting density on plant stature, flowering time, and ear set in IBM populations of maize

dc.contributor.advisor Nick Lauter
dc.contributor.advisor Kendall Lamkey
dc.contributor.author Helland, Sara
dc.contributor.department Department of Agronomy
dc.date 2018-08-11T14:26:26.000
dc.date.accessioned 2020-06-30T02:42:00Z
dc.date.available 2020-06-30T02:42:00Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2012
dc.date.embargo 2013-06-05
dc.date.issued 2012-01-01
dc.description.abstract <p>Plant stature, flowering time and ear set are related to maturity, disease and insect resistance, drought tolerance, root lodging and yield, which are all major trait targets for maize breeders. In an effort to understand the effects of year, location, and planting density on these traits, we grew the IBMRIL and IBMDH populations in high and low density at several locations in the cornbelt over a period of years. The effects of temperature, precipitation, and solar radiation at key crop growth phases were quantified for each trait using partial least squares regression. The heritability of each trait across high and low planting densities was estimated. Using composite interval mapping, we placed by- and across-environment and density QTL for these traits on a dense genetic map. The effects of environment and planting density on each of these traits were significant. Several QTL with very narrow confidence intervals and functions of interest to breeding programs were identified, and QTL were detected differentially across environments and planting densities. Use of phenotypic and genotypic selection for plant stature, flowering time, and ear set is discussed, and functional hypotheses for these QTL are explored in the context of previously identified QTL.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/12340/
dc.identifier.articleid 3347
dc.identifier.contextkey 3437705
dc.identifier.doi https://doi.org/10.31274/etd-180810-452
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/12340
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/26529
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/12340/Helland_iastate_0097E_12636.pdf|||Fri Jan 14 19:19:03 UTC 2022
dc.subject.disciplines Genetics
dc.subject.disciplines Plant Sciences
dc.subject.keywords Density
dc.subject.keywords flowering time
dc.subject.keywords maize
dc.subject.keywords meteorological
dc.subject.keywords plant height
dc.subject.keywords QTL
dc.title Effects of environment and planting density on plant stature, flowering time, and ear set in IBM populations of maize
dc.type dissertation
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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