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Iowa State University

Plant Sciences

Soybean

2011

Articles 1 - 4 of 4

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Effects Of Phosphorus And Potassium Fertilization Rate And Placement Method On Soybean (Glycine Max L.) Seed Quality And Long-Term Storability, Keaton Krueger Jan 2011

Effects Of Phosphorus And Potassium Fertilization Rate And Placement Method On Soybean (Glycine Max L.) Seed Quality And Long-Term Storability, Keaton Krueger

Graduate Theses and Dissertations

The fertilization rate and placement methods of phosphorus and potassium fertilizers can positively affect soybean [Glycine max L. (Merr.)] seed composition and yield in some environments, but not in others. Soybean seed production costs and chemically-treated seed disposal costs have increased, coinciding with farmers' adoption of planting chemically-treated soybean seeds. Seeds are treated with fungicides and sometimes with insecticides to provide protection from pathogens and insects before seed emergence. These changes in production costs have renewed seed industry's interest in identifying agronomic practices that enhance soybean quality, composition, and storability. Soybean seeds do not store well and seed quality ...


Utilization Of Near-Isogenic Lines To Identify Genes Underlying Iron-Efficiency Qtl, Gregory Allan Peiffer Jan 2011

Utilization Of Near-Isogenic Lines To Identify Genes Underlying Iron-Efficiency Qtl, Gregory Allan Peiffer

Graduate Theses and Dissertations

Nutrient deficiencies are a significant abiotic stress of soybean. Iron deficiency chlorosis is a major concern in the upper midwestern region of the United States due to the prevalence of calcareous soils. Soybean's susceptibility to iron stress results in yield losses into the hundreds of millions each year. Understanding the molecular differences between resistant and susceptible cultivars will significantly affect future yield and revenue. Through the use of near-isogenic lines (NILs), molecular markers, and gene expression we have identified the donor parent introgressions through both classical SSR mapping and a novel method of SNP clustering which can be preformed ...


Replication Protein A And Its Role In The Iron Stress Response Of Soybean, Sarah Atwood Jan 2011

Replication Protein A And Its Role In The Iron Stress Response Of Soybean, Sarah Atwood

Graduate Theses and Dissertations

Soybean (Glycine max (L.) Merr.) is the second most abundant crop in the United States, with a total crop value of nearly $39 billion in 2010. U.S. soybean exports are used as an important protein and oil source in over 80 countries. Abiotic stress, such as iron deficiency chlorosis (IDC), threatens soybean yields, which affect farmers' profits in the United States as well as nutrition of consumers all over the world. IDC occurs when iron is unavailable to soybean roots, often in the calcareous soils of the upper Midwest United States. Iron stress causes a decrease in chlorophyll production ...


Environmental Analyses And Candidate Gene Expression Of Ms9 Male-Sterility Locus And Computational Identification Of Candidate Genes For Male-Sterility Loci In Soybean, Christiana Wiebbecke Jan 2011

Environmental Analyses And Candidate Gene Expression Of Ms9 Male-Sterility Locus And Computational Identification Of Candidate Genes For Male-Sterility Loci In Soybean, Christiana Wiebbecke

Graduate Theses and Dissertations

Rapid growth rate of the human population is driving the increased demand for cultivated soybean [Glycine max (L.) Merrill], a major source of protein and oil in global food, feed, and biofuel production. Increasing yield at a pace faster than traditional breeding methods presently achieve has become a need and future commitment. In soybean, a self-pollinated crop, a possibility to increase yield may result from the development of hybrid cultivars. Researchers have been interested in floral development and pollination, as these factors have a direct impact on maintaining and enhancing crop yields. Soybean breeders also need to understand phenotypic differences ...