Selection-induced differences among Iowa Stiff Stalk Synthetic strains Oyervides-Garcia, Manuel
dc.contributor.department Agronomy 2018-08-16T16:39:05.000 2020-07-02T06:05:24Z 2020-07-02T06:05:24Z Sun Jan 01 00:00:00 UTC 1984 1984
dc.description.abstract <p>Relative performance of nine 'Iowa Stiff Stalk Synthetic' (BSSS) strains of maize (Zea mays L.) was determined by evaluating the strains per se and diallel crosses among the strains. The study also included the S(,1) generation of each strain and each strain cross. Yield differences among the strains and the level of heterosis exhibited by their crosses indicated genetic diversity among the different strains due to selection. Generally, the strains that had the greatest number of cycles of selection performed better and were more genetically divergent. Estimates of inbreeding depression effects were considerably lower for the highly selected strains and for crosses involving the selected strains. Magnitude of estimates of additive effects for yield tended to reflect the selection history of each strain. Estimates of dominance effects indicated that intrapopulation dominance effects were important in all the strains. A reduction in yield improvement due to reduced effective population numbers was detected. Selection for resistance to Ostrinia nubilalis Hubner did not show a significant effect on yield, but a negative correlated response on yield was observed after two cycles of selection for resistance to Diabrotica virgifera Le Conte;Grain yield responses of BSSS strains and strain crosses were accompanied by changes in ability to respond to environmental variations. Recurrent selection generally was effective for increasing yield in all types of environments, particularly in less favorable ones. Selection for pest resistance in BSSS(CB) and BSSS(RW) caused important changes in both yielding capacity and ability to respond to environmental changes.</p>
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dc.identifier archive/
dc.identifier.articleid 9204
dc.identifier.contextkey 6330809
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/8205
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 02:08:19 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.keywords Agronomy
dc.subject.keywords Plant breeding and cytogenetics
dc.title Selection-induced differences among Iowa Stiff Stalk Synthetic strains
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a dissertation Doctor of Philosophy
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