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Multicellular Secretory Trichome Development On Soybean And Related Glycine Gynoecia, R. A. Healy, R. G. Palmer, Harry T. Horner May 2009

Multicellular Secretory Trichome Development On Soybean And Related Glycine Gynoecia, R. A. Healy, R. G. Palmer, Harry T. Horner

Genetics, Development and Cell Biology Publications

Multicellular glandular trichomes form on gynoecia of wild annual Glycine species, annual soybean cultivars, and wild perennial Glycine species. These trichomes occur from the ovary base to the style base and, in perennial species, along the style as well.Trichomes form at least 2 d before anthesis, and new trichomes develop throughout flowering and also on young seed pods. Trichome structure is similar in all taxa examined, usually five to seven linearly arranged cells. Stalk cells with callose walls become highly vacuolate, and their cytoplasms have reduced numbers of Golgi bodies and endoplasmic reticulum. During secretion, two to four distal ...


Genetic Improvement Of Seedling Emergence Of Low-Phytate Soybean Lines, Loren Ambrose Trimble Jan 2009

Genetic Improvement Of Seedling Emergence Of Low-Phytate Soybean Lines, Loren Ambrose Trimble

Graduate Theses and Dissertations

Reduced seedling emergence of low-phytate (LP) soybean [Glycine max (L.) Merr.] lines with the pha1 and pha2 alleles has been a limiting factor in the development of LP cultivars. Crosses between normal-phytate (NP) and LP soybean lines have produced progeny with improved emergence. The objective of this study was to determine if LP lines with improved emergence are capable of producing progeny with equal or higher emergence when crossed to NP parents. LP lines with improved emergence were crossed to NP cultivars and the LP progeny were evaluated with seed produced at three 2007 locations and five 2008 locations. A ...


Genomic Analysis Of A Major Seed Protein/Oil Qtl Region On Soybean Linkage Group I, Bindu Joseph Jan 2009

Genomic Analysis Of A Major Seed Protein/Oil Qtl Region On Soybean Linkage Group I, Bindu Joseph

Graduate Theses and Dissertations

The economic and nutritional value of soybeans is determined by its seed protein and oil contents. The genetic control of seed protein/oil is quantitative and many genomic regions associated with the regulation of these traits have been identified in soybean. The protein/oil quantitative trait locus (QTL) mapped to LG I (chromosome 20) is ubiquitous among high protein soybean lines. Identification of the candidate gene(s) underlying this major QTL would help us understand the genetic and molecular mechanisms regulating seed protein/oil accumulation in soybean. Map based cloning to identify the candidate genes for the LG I QTL ...


Cyst Nematode Resistance And Seed Yield Of Soybean Lines Derived From Ss97-6946, Gregory Lynn Doonan Jan 2009

Cyst Nematode Resistance And Seed Yield Of Soybean Lines Derived From Ss97-6946, Gregory Lynn Doonan

Graduate Theses and Dissertations

New sources of resistance to the soybean cyst nematode (SCN) (Heterodera glycines Ichinohe) would be useful for soybean [Glycine max (L.) Merr.] cultivar development. The objective of this study was to determine the relationship between SCN resistance and seed yield for a new source of SCN resistance, SS97-6946, developed by the Univ. of Missouri-Columbia. F5-derived lines were developed from the cross of SS97-6946 x S27-T7, a SCN-susceptible cultivar developed by Syngenta. Nine sets of 32 F5:8 lines each were evaluated for yield in replicated tests at five Midwest locations during 2007. The lines were evaluated for resistance to four ...


Agronomic, Seed Composition And Molecular Characteristics Of Soybean Lines With Novel Genes For Modified Glycinin And Beta-Conglycinin Content, Jonathan Jenkinson Jan 2009

Agronomic, Seed Composition And Molecular Characteristics Of Soybean Lines With Novel Genes For Modified Glycinin And Beta-Conglycinin Content, Jonathan Jenkinson

Graduate Theses and Dissertations

Soybean [Glycine max (L.) Merr.] genotypes with increased beta-conglycinin (BC) and reduced glycinin (Gly) may be beneficial to food product quality and to human health. A soybean line, B2G2, developed in Japan, has the recessive alleles gy1, gy2, gy3, gy4, and gy5 that control Gly content. Its seed protein has about 50 g kg-1 BC and 0 g kg-1 Gly. Monsanto Co. has used B2G2 to develop lines with different combinations of recessive and wild-type alleles at the five Gy loci. The first objective of this research was to determine the influence of different combinations of the gy and Gy ...


Use Of Seed Treatments And Inoculants In No-Tillage Soybean Production Practices, Joseph John Osenga Jan 2009

Use Of Seed Treatments And Inoculants In No-Tillage Soybean Production Practices, Joseph John Osenga

Graduate Theses and Dissertations

Soybean producers using no-tillage practices in the Upper Midwest encounter cooler, wetter soil conditions early in the growing season that slow crop growth and favor damping-off pathogens. The goal of this thesis work was to evaluate the use of soybean seed treatments and inoculants in no-tillage compared to conventional tillage practices in Iowa. The research reported in this thesis is divided into three specific objectives. The first objective was to evaluate the use of soybean seed treatments and inoculants in no-tillage and conventional tillage across Iowa. It was concluded that there was no evidence that the use of seed treatments ...


Nozzle And Carrier Application Effects On Control Of Soybean Leaf Spot Diseases, H. Mark Hanna, Alison E. Robertson, W. Mark Carlton, Robert E. Wolf Jan 2009

Nozzle And Carrier Application Effects On Control Of Soybean Leaf Spot Diseases, H. Mark Hanna, Alison E. Robertson, W. Mark Carlton, Robert E. Wolf

Agricultural and Biosystems Engineering Publications

Increased soybean foliar disease potential has heightened grower interest in fungicide application techniques. Application field trials comparing application rate [187 vs. 112 L/ha (20 vs. 12 gal/acre)], nozzle style (twin-orifice; single-orifice) and spray quality (fine vs. medium and coarse spray quality), and application technique (with and without air-assist) along with an unsprayed check were done at two locations over two years. Fungicide deposition (coverage and droplet size) and disease severity in the bottom, middle, and top parts of the plant canopy, and soybean yield were measured.