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2006

Iowa State University

Agricultural Science

Plant breeding

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A Quantitative Trait Response Evaluation To Selection In The Bs13(S) Maize (Zea Mays L.) Population , Clinton J. Turnbull Jan 2006

A Quantitative Trait Response Evaluation To Selection In The Bs13(S) Maize (Zea Mays L.) Population , Clinton J. Turnbull

Retrospective Theses and Dissertations

Seven cycles of half-sib recurrent selection were conducted in the BSSS maize population followed by ten cycles of S2 progeny recurrent selection. The population under S2 progeny recurrent selection is formally known as BS 13(S). The selection criteria have always placed importance on high grain yield, low grain moisture, and reduced plant lodging. Two evaluations estimating the response of multiple agronomic traits in multiple response units including the population sampled at F IS = 0, FIS = 0.5, and FIS = 0.75 levels of inbreeding, and multiple testcrosses of the population were conducted. The average response of grain yield in ...


Genetic Improvement Of Seedling Emergence Of Soybean Lines With Low Phytate , Jordan Dustin Spear Jan 2006

Genetic Improvement Of Seedling Emergence Of Soybean Lines With Low Phytate , Jordan Dustin Spear

Retrospective Theses and Dissertations

Seedling emergence of low-phytate (LP) soybean [Glycine max (L.) Merr.] lines has been reported to be lower than that of normal-phytate (NP) lines. One objective of this study was to evaluate if backcrossing the LP trait into a NP line would result in LP progeny with normal emergence. The LP line CX1834-1-6 (CX1834) was crossed to B01769B019 (B019), a NP line with reduced palmitate content, and three backcrosses were made to B019. A total of 36 BC3F4-derived LP lines from the population were evaluated at five locations in 2005 in comparison with CX1834, B019, and a NP cultivar IA3023. The ...


Evaluation Of Seven Stiff-Stalk And Five Non-Stiff-Stalk Corn Populations, Hybrids, And S1'S , Thomas Edward Scheffler Jan 2006

Evaluation Of Seven Stiff-Stalk And Five Non-Stiff-Stalk Corn Populations, Hybrids, And S1'S , Thomas Edward Scheffler

Retrospective Theses and Dissertations

Performance of corn (Zea mays L.) breeding programs is based on germplasm selection of breeding populations and the ability to recognize and utilize heterotic patterns. The objective of this research is to identify superior corn populations that could be useful germplasm sources in producing inbreds for hybrid corn production. Population hybrids were produced using seven Stiff-Stalk and five Non-Stiff-Stalk populations. The 35 F1 hybrids and the original 12 populations were evaluated in an S0 randomized complete block design experiment at five locations in Iowa during 2003 and 2004. Concurrently, each of the 35 hybrids and 12 populations were selfed and ...


Phenotypic, Biochemical, And Molecular Diversity In Coriander (Coriandrum Sativum L) Germplasm, Pedro Antonio López Jan 2006

Phenotypic, Biochemical, And Molecular Diversity In Coriander (Coriandrum Sativum L) Germplasm, Pedro Antonio López

Retrospective Theses and Dissertations

A study was conducted to assess phenotypic, biochemical, and molecular diversity in coriander accessions from the North Central Regional Plant Introduction Station, in Ames, IA; initially, 139 accessions were characterized for phenological and morphological traits and for fatty-acid composition. A second year of data was collected on those traits from 60 accessions. Fruit essential-oil content and composition were determined, along with a headspace analysis from leaves and an analysis of amplified fragment length polymorphisms (AFLPs). Basic statistics and Pearson correlations were estimated. Matrices of geographical distances (GD), modified Rogers' (MD) distances for molecular data, and Euclidean distances for phenotypic (PD ...


Molecular Genetic Analyses Of Oilseed Brassica Germplasm: Determination Of Life Forms And Germplasm Management Strategies By Using Microsatellite Markers And Flowering Locus-C (Flc1 And Flc3) Gene Sequences , Von Mark V. Cruz Jan 2006

Molecular Genetic Analyses Of Oilseed Brassica Germplasm: Determination Of Life Forms And Germplasm Management Strategies By Using Microsatellite Markers And Flowering Locus-C (Flc1 And Flc3) Gene Sequences , Von Mark V. Cruz

Retrospective Theses and Dissertations

Molecular markers were utilized in conjunction with phenological and morphological information, and statistical methods for diversity analyses to address plant genetic resource conservation issues. The objectives of this study have been categorized into two sets. The first set pertains to exploratory surveys of genetic variation using molecular markers and DNA sequences to determine if microsatellite markers or variation in two copies of the FLOWERING LOCUS C gene (FLC1 and FLC3) can be used in determining life forms of fifty representative accessions of Brassica napus. The second set of objectives addresses good genebank practices and includes: characterization of flowering time of ...