Surveying genetic and phenotypic variation for response to density stress in maize wheat and barley.,
2010-04
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Surveying genetic and phenotypic variation for response to density stress in maize wheat and barley.,
Authors
Published Date
2010-04
Publisher
Type
Thesis or Dissertation
Abstract
Increasing plant population density can increase biomass and grain yield on a per area unit basis, however this relationship is curvilinear where eventually a high plant density will overwhelm the tolerance to density stress and yield per unit area will decrease. The main objective of this thesis is to gain an understanding of the genetic and morphological responses to density stress. In the first part of this thesis, we examined differential gene expression in seedlings of four barley genotypes and five maize genotypes grown at low and high densities. A microarray analysis approach was employed and identified 219 and 35 transcripts differentially expressed in barley and maize, respectively, with little gene expression patterns overlap among genotypes, indicating that these genotypes respond in very different ways and may have different mechanisms to deal with density stress. In the second part of this thesis, we examined multiple genotypes of maize, wheat, and barley planted at three different densities with the highest density being up to three times the normal density. A combined genotype analysis for each species showed that the highest plant density had the greatest biomass yield m-2 for wheat and maize while barley had no significant difference among the three densities for biomass yield m-2. For grain yield m-2, barley had the lowest yield at the highest plant density, wheat had no difference among the densities and maize had the greatest grain yield m-2 in the high plant density.
Description
University of Minnesota M.S. thesis. April 2010. Major: Applied Plant Sciences. Adivisors: Gary J. Muehlbauer and Nathan M. Springer. 1 computer file (PDF); v, 96 pages. Ill. (some col.)
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
St. Pierre, Summer Lea. (2010). Surveying genetic and phenotypic variation for response to density stress in maize wheat and barley.,. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/93401.
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.