Heterosis between semidormant and nondormant derived alfalfa germplasm

dc.contributor.author Sakiroglu, Muhammet
dc.contributor.department Agronomy
dc.date 2020-08-21T23:10:41.000
dc.date.accessioned 2021-02-26T08:49:46Z
dc.date.available 2021-02-26T08:49:46Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2004
dc.date.issued 2004-01-01
dc.description.abstract <p>Alfalfa (Medicago sativa L.) yield has not increased over the past 25 years in the Midwestern United States. One way to increase yield in alfalfa is through capturing heterosis. Heterotic groups are genetically distinct germplasms that, when hybridized, repeatedly produce progeny that express heterosis. In alfalfa, three main heterotic groups have been proposed in the United States: dormant M. falcata, semidormant M. sativa, and nondormant M. sativa. Nondormant alfalfa cannot be used in the upper Midwestern United States due to severe winterkill. Three cycles of recurrent selection were conducted in four nondormant cultivars and winter hardiness was substantially improved in all four. The objective of this study was to test the hypothesis that the nondormant derived alfalfa germplasm represents a heterotic group distinct from Midwestern United States cultivars. Four elite Midwestern alfalfa cultivars and the four nondormant derived populations were hand crossed in a half diallel mating design. A seeded trial was established at one Iowa location in 2003 and transplanted trials grown at two locations at 2004. In spite of the observation of better yield in some of the particular crosses, a general heterotic pattern was not observed between the two proposed groups.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/20263/
dc.identifier.articleid 21262
dc.identifier.contextkey 18970560
dc.identifier.doi https://doi.org/10.31274/rtd-20200817-56
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/20263
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/97630
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/20263/Sakiroglu_ISU_2004_S25.pdf|||Fri Jan 14 22:22:14 UTC 2022
dc.subject.keywords Agronomy
dc.subject.keywords Plant breeding
dc.title Heterosis between semidormant and nondormant derived alfalfa germplasm
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
thesis.degree.discipline Plant Breeding
thesis.degree.level thesis
thesis.degree.name Master of Science
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