Comparison of three recurrent selection regimes for increasing groat-oil content of oat

dc.contributor.advisor K. J. Frey
dc.contributor.author Schipper, Harm
dc.contributor.department Agronomy
dc.date 2018-08-16T04:51:27.000
dc.date.accessioned 2020-07-02T06:14:21Z
dc.date.available 2020-07-02T06:14:21Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 1991
dc.date.issued 1991
dc.description.abstract <p>Recurrent selection has been conducted in various ways. In this study, three recurrent selection regimes for increasing groat-oil content of oat (Avena sativa L.) were compared. In regimes 1 and 2 selection was based on field- and greenhouse-grown S[subscript]0 plants, respectively, whereas in regime 3 selection was practiced among field-grown S[subscript]0 plants followed by selection among and within greenhouse-grown S[subscript]0:1 progenies. In a replicated experiment conducted over two years in the field and greenhouse, 48 oat lines were evaluated for groat-oil content. The results indicated that gain in groat-oil content from selection in the greenhouse would be 68% as effective as from selection in the field. The predicted annual gains in groat-oil content were 9.45, 4.57, and 11.58 g kg[superscript]-1 for regimes 1, 2, and 3, respectively. The actual response in groat-oil content to the three recurrent selection regimes was evaluated in a replicated field experiment grown at two locations. The annual gains were 6.04, 5.85, and 11.98 g kg[superscript]-1 for regimes 1, 2, and 3, respectively. Regime 3 was the most effective for increasing the groat-oil content. Gains for regimes 1 and 2 were not significantly different. A line was developed that had 162.85 g kg[superscript]-1 groat-oil. Significant genetic variation for groat-oil content was present in all cycles of selection, so continued progress from selection can be expected. A correlated increase in oil yield and decreases in grain yield, seed weight, and test weight occurred in regimes 1 and 3. The fatty acid composition of groat-oil changed significantly over cycles of selection in regime 1. The ratio of unsaturated to saturated fatty acids increased. A new regime that utilizes selection among field-grown S[subscript]0 plants, selection among and within replicated field-grown S[subscript]0:1 progenies, and a restricted selection index, was proposed.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/9579/
dc.identifier.articleid 10578
dc.identifier.contextkey 6360206
dc.identifier.doi https://doi.org/10.31274/rtd-180813-13032
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/9579
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/82692
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/9579/r_9126247.pdf|||Sat Jan 15 02:34:48 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Genetics
dc.subject.keywords Agronomy
dc.subject.keywords Plant breeding and cytogenetics
dc.title Comparison of three recurrent selection regimes for increasing groat-oil content of oat
dc.type article
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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