Population Genetic Diversity in a Maize Reciprocal Recurrent Selection Program

dc.contributor.author Nason, John
dc.contributor.author Hinze, Lori
dc.contributor.author Kresovich, Stephen
dc.contributor.author Nason, John
dc.contributor.author Lamkey, Kendall
dc.contributor.author Lamkey, Kendall
dc.contributor.department Agronomy
dc.date 2018-02-16T07:43:58.000
dc.date.accessioned 2020-06-29T23:05:05Z
dc.date.available 2020-06-29T23:05:05Z
dc.date.issued 2005-11-01
dc.description.abstract <p>The genetic structures of the Iowa Corn Borer Synthetic #1 (CB) and Iowa Stiff Stalk Synthetic (SS) maize (<em>Zea mays</em> L.) populations are important because these populations serve as the model for development of modern commercial hybrids. In 1949, CB and SS were used to start a reciprocal recurrent selection (RRS) breeding program at Iowa State University. This study was conducted to analyze more thoroughly the genetic diversity within this RRS program and illustrate how the RRS program has changed over time at the molecular level. The progress of this program was measured by analyzing the variation at 86 SSR loci among 28 progenitor lines and 30 plants sampled from each of seven cycles (Cycle 0, Cycle 1, Cycle 3, Cycle 6, Cycle 9, Cycle 12, and Cycle 15) in each population. The progenitors of these populations show a high amount of variation on the basis of expected heterozygosity (0.557). As the RRS program proceeded, this variation decreased (Cycle 15, 0.245). In total, a larger amount of genetic variation was found among plants within cycles (66%) than among cycles (13%) or between populations (21%). The repartitioning of variation from within populations (96% in progenitors) to between populations (58% in Cycle 15) over time is consistent with theoretical expectations of divergence between the populations. By sampling intermediate time points, we gained a comprehensive genetic view of CB and SS permitting evaluation of the molecular-level changes occurring as a result of reciprocal recurrent selection.</p>
dc.description.comments <p>This article is from <em>Crop Science</em> 45 (2005): 2435–2442, doi:<a href="http://dx.doi.org/10.2135/cropsci2004.0662" target="_blank">10.2135/cropsci2004.0662</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/42/
dc.identifier.articleid 1042
dc.identifier.contextkey 7031689
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/42
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4776
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/42/2005_Hinze_PopulationGenetic.pdf|||Sat Jan 15 00:12:11 UTC 2022
dc.source.uri 10.2135/cropsci2004.0662
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Genetics
dc.subject.disciplines Plant Breeding and Genetics
dc.subject.disciplines Population Biology
dc.title Population Genetic Diversity in a Maize Reciprocal Recurrent Selection Program
dc.type article
dc.type.genre article
dspace.entity.type Publication
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