Genomewide Selection and Prospective Targeted Recombination in Elite Maize Biparental Crosses
2018-08
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Genomewide Selection and Prospective Targeted Recombination in Elite Maize Biparental Crosses
Authors
Published Date
2018-08
Publisher
Type
Thesis or Dissertation
Abstract
Genomewide selection is now routine in maize (Zea mays L.). The first two studies in this dissertation investigated advanced aspects of genomewide selection, whereas the last study investigated the potential of targeted recombination in elite biparental crosses. The three studies utilized data on 969 maize populations that were phenotyped for yield, moisture, and test weight at multiple years and locations and genotyped with 2911 single nucleotide polymorphism markers. The first study showed that prior selection in the training population reduced the response to selection and predictive ability, but it did not increase the similarity among the best lines. Including a small number of the poorest lines in the training population nearly restored the predictive ability to its original level. The second study showed that in genomewide selection, it is better to use a smaller ad hoc training population than a single, large training population. In particular, the response to selection and predictive ability were lower in a global training population with about 50,000 lines than in a set of about 4500 lines chosen to maximize relatedness with the population undergoing genomewide selection. The third study showed that on average, targeted recombination doubled the predicted gains. For each trait, the gains with targeted recombination were 60% to 400% of the gains from nontargeted recombination. Targeted recombination did not increase gains in only around 4% of the populations. The results indicated that targeted recombination is a potentially powerful sequel to genomewide selection in maize.
Description
University of Minnesota Ph.D. dissertation. August 2018. Major: Applied Plant Sciences. Advisors: Rex Bernardo, Aaron Lorenz. 1 computer file (PDF); viii, 46 pages.
Related to
Replaces
License
Collections
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Brandariz Zerboni, Sofia. (2018). Genomewide Selection and Prospective Targeted Recombination in Elite Maize Biparental Crosses. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/201072.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.