Estimation of genetic parameters in two maize recurrent selection programs

dc.contributor.advisor Kendall R. Lamkey
dc.contributor.author Holthaus, Joel
dc.contributor.department Department of Agronomy
dc.date 2018-08-23T12:55:16.000
dc.date.accessioned 2020-06-30T07:11:29Z
dc.date.available 2020-06-30T07:11:29Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 1994
dc.date.issued 1994
dc.description.abstract <p>Recurrent selection is a cyclical breeding procedure that focuses on improving the mean performance of a population by increasing the frequency of favorable alleles, while maintaining adequate genetic variability for continued selection. Iowa Stiff Stalk Synthetic (BSSS) is a maize population that has undergone continuous recurrent selection for more than 50 years as the base population for two independent selection programs (intra- and inter-population);This study was designed to estimate the mean performance and important genetic parameters in BSSS populations per se after: seven cycles of half-sib (HS) progeny selection, six cycles of S2-progeny selection, and 11 cycles of reciprocal recurrent selection (RRS). A Design II (cross-classified) mating design was constructed to give direct estimates of additive and dominance variance in the individual populations. Fourteen sets of 4 male by 4 female matings for each of the populations were evaluated in a randomized incomplete block (Reps/Sets) experiment grown in multiple environments;RRS in BSSS produced the most effective mean performance responses for grain yield in the populations per se. S2-progeny selection in BSSS did not perform up to theoretical expectations. Variance component estimates showed very little significant change for the majority of the traits with all three selection methods. In general, the largest portion of the total genetic variance for all traits consisted of additive variance. However, dominance variance for grain yield seems to be an important component in BSSS germplasm. Genetic variance by environmental interaction variance components were generally of unimportant magnitude. The importance of dominance variance in BSSS provides for more effective response from selection with testcross selection methods that can take advantage of dominance genetic effects. With adequate levels of available additive genetic variance remaining and high heritability estimates for most of the traits of interest, future response from selection should be achieved with each selection method.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/11264/
dc.identifier.articleid 12263
dc.identifier.contextkey 6453495
dc.identifier.doi https://doi.org/10.31274/rtd-180813-10329
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/11264
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/64502
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/11264/r_9518387.pdf|||Fri Jan 14 18:46:10 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
dc.title Estimation of genetic parameters in two maize recurrent selection programs
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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