Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 30 of 143

Full-Text Articles in Entire DC Network

Machine Learning Approach For Prescriptive Plant Breeding, Kyle A. Parmley, Race H. Higgins, Baskar Ganapathysubramanian, Soumik Sarkar, Asheesh K. Singh Nov 2019

Machine Learning Approach For Prescriptive Plant Breeding, Kyle A. Parmley, Race H. Higgins, Baskar Ganapathysubramanian, Soumik Sarkar, Asheesh K. Singh

Mechanical Engineering Publications

We explored the capability of fusing high dimensional phenotypic trait (phenomic) data with a machine learning (ML) approach to provide plant breeders the tools to do both in-season seed yield (SY) prediction and prescriptive cultivar development for targeted agro-management practices (e.g., row spacing and seeding density). We phenotyped 32 SoyNAM parent genotypes in two independent studies each with contrasting agro-management treatments (two row spacing, three seeding densities). Phenotypic trait data (canopy temperature, chlorophyll content, hyperspectral reflectance, leaf area index, and light interception) were generated using an array of sensors at three growth stages during the growing season and seed ...


Phenotypic And Molecular Characterization Root System Architecture In Diverse Soybean (Glycine Max L. Merr.) Accessions, Kevin G. Falk Jan 2019

Phenotypic And Molecular Characterization Root System Architecture In Diverse Soybean (Glycine Max L. Merr.) Accessions, Kevin G. Falk

Graduate Theses and Dissertations

Root system architecture (RSA), or the spatial arrangement of the root and its morphology, functions to anchor the plant, provide water and nutrient acquisition, nutrient storage and to facilitate plant-microbe interactions such as nodulation in legumes such as soybean [Glycine max L. Merr.)]. Root structure also correlates to environmental advantages, such as nutrient acquisition, drought, flood tolerance, and lodging resistance. After centuries of indirect selection for RSA, there is a focus to harness soybean RSA diversity for exploitation and implementation into cultivar development programs. Researchers have generally taken one of three strategies to approach root phenotyping including controlled laboratory, moderately ...


Crispr In Plant Breeding, Edward Rowe Jan 2019

Crispr In Plant Breeding, Edward Rowe

Creative Components

No abstract provided.


Machine Learning For High-Throughput Stress Phenotyping In Plants, Arti Singh, Baskar Ganapathysubramanian, Asheesh Kumar Singh, Soumik Sarkar Feb 2016

Machine Learning For High-Throughput Stress Phenotyping In Plants, Arti Singh, Baskar Ganapathysubramanian, Asheesh Kumar Singh, Soumik Sarkar

Mechanical Engineering Publications

Advances in automated and high-throughput imaging technologies have resulted in a deluge of high-resolution images and sensor data of plants. However, extracting patterns and features from this large corpus of data requires the use of machine learning (ML) tools to enable data assimilation and feature identification for stress phenotyping. Four stages of the decision cycle in plant stress phenotyping and plant breeding activities where different ML approaches can be deployed are (i) identification, (ii) classification, (iii) quantification, and (iv) prediction (ICQP). We provide here a comprehensive overview and user-friendly taxonomy of ML tools to enable the plant community to correctly ...


Optimal Population Value Selection: A Population-Based Selection Strategy For Genomic Selection, Matthew Daniel Goiffon Jan 2016

Optimal Population Value Selection: A Population-Based Selection Strategy For Genomic Selection, Matthew Daniel Goiffon

Graduate Theses and Dissertations

In order to feed the world’s growing population, an interdisciplinary effort is needed. In this thesis, operations research tools of mathematical modeling, optimization, and simulation are used to improve an existing plant breeding method, genomic selection. To do this, a new method, called optimal population value (OPV) selection, is proposed. In this paper, OPV selection is first defined as an optimization problem that selects a breeding population using a population metric, instead of individual metrics. Then, OPV selection is thoroughly tested in a simulation study against the existing methods of genomic selection, weighted genomic selection, and optimal haploid value ...


Haploid And Doubled Haploid Techniques In Perennial Ryegrass (Lolium Perenne L.) To Advance Research And Breeding, Rachel F. Begheyn, Bruno Studer, Thomas Lubberstedt Jan 2016

Haploid And Doubled Haploid Techniques In Perennial Ryegrass (Lolium Perenne L.) To Advance Research And Breeding, Rachel F. Begheyn, Bruno Studer, Thomas Lubberstedt

Agronomy Publications

The importance of haploid and doubled haploid (DH) techniques for basic and applied research, as well as to improve the speed of genetic gain when applied in breeding programs, cannot be overstated. They have become routine tools in several major crop species, such as maize (Zea mays L.), wheat (Triticum aestivum L.), and barley (Hordeum vulgare L.). DH techniques in perennial ryegrass (Lolium perenne L.), an important forage species, have advanced to a sufficiently successful and promising stage to merit an exploration of what their further developments may bring. The exploitation of both in vitro and in vivo haploid and ...


Advances In Metabolomic Applications In Plant Genetics And Breeding, Marna D. Yandeau-Nelson, Nick Lauter, Olga A. Zabotina Jan 2015

Advances In Metabolomic Applications In Plant Genetics And Breeding, Marna D. Yandeau-Nelson, Nick Lauter, Olga A. Zabotina

Genetics, Development and Cell Biology Publications

Metabolomics is a systems biology discipline wherein abundances of endogenous metabolites from biological samples are identified and quantitatively measured across a large range of metabolites and/or a large number of samples. Since all developmental, physiological and 'response to the environment' phenotypes have at least one metabolic component phenotype, metabolomics offers the opportunity to mechanistically dissect how metabolic processes participate in determining these complex phenotypes. Plants produce an amazingly diverse array of primary and specialized metabolites (>200000 kingdom-wide), many of which are integral for our food, feed, fibre and fuel industries. Thus, applications of metabolomics in plant genetics and breeding ...


An Integrative Approach For Germplasm Utilization, Genetic Diversity And Qtl Mapping In Camelina Spp. And Crop-Production Issues In Thlaspi Arvense, New Promising Oilseed Crops For Bioenergy And Industrial Uses, Ivan Mauricio Ayala Diaz Jan 2014

An Integrative Approach For Germplasm Utilization, Genetic Diversity And Qtl Mapping In Camelina Spp. And Crop-Production Issues In Thlaspi Arvense, New Promising Oilseed Crops For Bioenergy And Industrial Uses, Ivan Mauricio Ayala Diaz

Graduate Theses and Dissertations

Fuel demands continue to increase to satisfy current energy needs. Fossil fuels are the primary source of energy and supply 80% of the total demand, 58% of which is used for transportation purposes. However, decreasing oil reserves, rising prices and negative environmental implications have all contributed to growing demand for alternative energy sources, such as bioenergy crops. Ideally a good bioenergy crop has low input requirements (able to grow in marginal zones), fast growth and maturity, tolerance to biotic and abiotic stress conditions, and high productivity. Camelina (Camelina sativa (L.) Crantz) and pennycress (Thlaspi arvense L.) have been targeted as ...


Relationship Between Chlorophyll Density And Spad Chlorophyll Meter Reading For Jerusalem Artichoke (Helianthus Tuberosus L.), Ruttanachira Ruttanaprasert, Sanun Jogloy, Nimitr Vorasoot, Thawan Kesmala, Rameshwar S. Kanwar, Carl C. Holbrook, Aran Patanothai Jun 2012

Relationship Between Chlorophyll Density And Spad Chlorophyll Meter Reading For Jerusalem Artichoke (Helianthus Tuberosus L.), Ruttanachira Ruttanaprasert, Sanun Jogloy, Nimitr Vorasoot, Thawan Kesmala, Rameshwar S. Kanwar, Carl C. Holbrook, Aran Patanothai

Agricultural and Biosystems Engineering Publications

Chlorophyll is an indicator of crop health and productivity. Measuring chlorophyll is usually done directly and requires significant time and resources. Indirect measurement of chlorophyll density using a handheld portable chlorophyll meter can reduce time. However, this information is very limited for Jerusalem artichoke. The objectives of this study were to examine the stability of chlorophyll density and SPAD chlorophyll meter reading (SCMR) and to evaluate the relationships between chlorophyll density and SCMR for different plant genotypes, at different plant ages and planting dates. Three Jerusalem artichoke varieties were evaluated for chlorophyll density and SCMR in a greenhouse at 13 ...


New Methods For Haploid Selection In Maize, Yichia Tseng Jan 2012

New Methods For Haploid Selection In Maize, Yichia Tseng

Graduate Theses and Dissertations

The major aim of this study was to evaluate new methods to select haploids for maize breeding. The first method was to evaluate different inbreds for sensitivity to herbicides that could be developed as a tool for haploid selection, and the second was to evaluate automated sorting based on near-infrared reflectance spectroscopy (NIRS) and SIMCA analysis.


Agronomic And Phenotypic Responses To 75 Years Of Recurrent Selection For Yield In The Iowa Stiff Stalk Synthetic Maize Population, Brent Howard Brekke Jan 2010

Agronomic And Phenotypic Responses To 75 Years Of Recurrent Selection For Yield In The Iowa Stiff Stalk Synthetic Maize Population, Brent Howard Brekke

Graduate Theses and Dissertations

The plant density at which Zea mays L. hybrids achieve maximum grain yield has increased throughout the hybrid era while grain yield on a per plant basis has increased little. Changes in plant traits including grain yield, moisture, test weight, stalk and root lodging, flag leaf angle, anthesis-silking interval(ASI), plant height, tassel branch number, and total number of leaves have been well characterized in comparisons of commercial hybrids representing different eras of hybrid maize production but have yet to be examined in a recurrent selection program.

The objective of this experiment was to determine if direct selection for grain ...


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 ...


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 ...


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 ...


Insect-Mediated Cross-Pollination In Male-Sterile, Female-Fertile Mutant Soybean [Glycine Max (L.) Merrill] Lines , Evelyn Ortiz-Perez Jan 2005

Insect-Mediated Cross-Pollination In Male-Sterile, Female-Fertile Mutant Soybean [Glycine Max (L.) Merrill] Lines , Evelyn Ortiz-Perez

Retrospective Theses and Dissertations

Currently, there is no economical way to produce large quantities of F1 hybrid soybean seed in the USA. One of the fundamental requirements for hybrid seed production is the availability of a stable male-sterile, female-fertile system. However, the more challenging barrier is the efficient transfer of pollen from the male parent to the female parent. This could potentially be achieved through pollinator insects. The objectives were to evaluate seed set among soybean lines segregating for male sterility, use phenotypic recurrent selection program to increase pollinator attraction of those male-sterile female-fertile identified as superior parental lines, and conduct agronomic tests for ...


Phenotypic And Molecular Analysis Of Oleate Content In Soybean , Jessie Lynn Alt Jan 2005

Phenotypic And Molecular Analysis Of Oleate Content In Soybean , Jessie Lynn Alt

Retrospective Theses and Dissertations

Soybean [Glycine max (L.) Merr.] oil with increased oleate content may be useful for certain food and industrial applications requiring increased oxidative stability. M23, obtained Saga University, Japan, is a mid-oleate line developed by X-ray irradiation with twice the oleate content of normal soybean cultivars. The first objective of this study was to determine if molecular selection for the ol allele associated with the deletion of Fad2-1 could identify mid-oleate individuals in the F 2 population of 'Archer' x M23. The segregation among F 2 plants satisfactorily fit a ratio of 1 homozygous OlOl: 2 heterozygous Olol: 1 homozygous olol ...


Maize Breeding, J. S. C. Smith, O. S. Smith, Kendall R. Lamkey Jan 2005

Maize Breeding, J. S. C. Smith, O. S. Smith, Kendall R. Lamkey

Agronomy Publications

Maize (Zea mays L.) is a remarkable plant. Human societies depend upon maize for food, health, scientific knowledge, economic growth, culture and spirituality. Maize breeders have improved productivity through selection on phenotype. Future improvements in maize productivity will require more effective utilization of genetic resources including direct selection upon genotype. Success will require a greater understanding of the complex biology of quantitative traits and a more thorough evaluation of the broader genetic base of maize. Maize breeders are fortunate and privileged to work with a species that encompasses a broad array of diversity and which provides a rich source of ...


Genetic Diversity Among Progenitors And Derived Lines Of Two Maize (Zea Mays L.) Populations , James R. Rouse Jan 2004

Genetic Diversity Among Progenitors And Derived Lines Of Two Maize (Zea Mays L.) Populations , James R. Rouse

Retrospective Theses and Dissertations

Forty-six inbreds related to Iowa Stiff Stalk Synthetic (BSSS) and Iowa Corn Borer Synthetic #1 (BSCB1) were assayed for polymorphism at 227 microsatellite loci. The inbreds consisted of progenitors of BSSS and BSCB1 as well as elite lines derived from those populations. Diversity statistics were used to estimate genetic variability among the derived lines, and to locate regions of the maize genome that have changed as a result of artificial selection. The four groups of germplasm were labeled CBP and SSP for the progenitors of BSCB1 and BSSS, respectively, and CBL and SSL for the lines derived from BSCB1 and ...


Molecular And Genetic Characterization Of The Inheritance And Expression Of The Synthetic Porcine Alpha-Lactalbumin Transgene In Maize (Zea Mays L) , Earl H. Bicar Jan 2003

Molecular And Genetic Characterization Of The Inheritance And Expression Of The Synthetic Porcine Alpha-Lactalbumin Transgene In Maize (Zea Mays L) , Earl H. Bicar

Retrospective Theses and Dissertations

A codon-adjusted version of a gene encoding the porcine milk protein alpha-lactalbumin was synthesized to create maize with improved nutritional quality. Three expression vectors (P64, P45, P57) containing the synthetic gene were constructed and transformed into maize callus by particle bombardment. The constructs differed in their promoters and subcellular targeting domains. PCR analysis showed that the alpha-La transgene was integrated into the maize genome and transmitted to the F1 generation. Western blot analysis indicated that the transgenes were functional and the alpha-La protein accumulated in the target endosperm. Genomic Southern blot analysis detected no new rearrangements demonstrating stable transgene integration ...


Genetic Basis Of Autumn Growth And Winter Hardiness In Alfalfa , Baldomero Alarcón Zúñiga Jan 2003

Genetic Basis Of Autumn Growth And Winter Hardiness In Alfalfa , Baldomero Alarcón Zúñiga

Retrospective Theses and Dissertations

Alfalfa (Medicago sativa L.) has a broad geographic distribution, with populations adapted to both cold and warm climates. Despite considerable research on winter hardiness, the mechanisms and genetic control of winter survival are poorly understood. We conducted two experiments designed to identify and quantify morphological, physiological, and biochemical traits associated with winter hardiness and to estimate the genetic relationship of these traits with winter hardiness. In Experiment 1, ten alfalfa genotypes were planted in June 2000 and in May 2001 at Ames, IA, and traits were measured in August, November, and the following April in each year. Concentrations of palmitate ...


Crop Improvement Through Genetic Engineering: Development Of Transformation Technologies And Production Of Stress Tolerant Transgenic Crops , Huixia Shou Jan 2003

Crop Improvement Through Genetic Engineering: Development Of Transformation Technologies And Production Of Stress Tolerant Transgenic Crops , Huixia Shou

Retrospective Theses and Dissertations

With the increase of environmental degradation, the crop improvement of stress tolerance becomes more important. Little success, however, has been achieved through traditional breeding method because of the limited availability of germplasm and the complexity of the genetic control of stress tolerance traits. Genetic engineering allows gene transfer between unrelated species. It greatly widens the genetic resource and is a good alternative for the improvement of stress tolerance. The goal of this study is to produce stress-tolerant maize and soybean to adapt to environmental stresses. Genetic transformation is used as a tool to achieve the goal. Since transformation technologies in ...


Molecular Marker Analysis Of Population Genetic Structure And Progress From Reciprocal Recurrent Selection In Two Iowa Maize (Zea Mays L) Populations , Lori Lynn Hinze Jan 2003

Molecular Marker Analysis Of Population Genetic Structure And Progress From Reciprocal Recurrent Selection In Two Iowa Maize (Zea Mays L) Populations , Lori Lynn Hinze

Retrospective Theses and Dissertations

Studies of the genetic structure of the Iowa Corn Borer Synthetic #1 (CB) and Iowa Stiff Stalk Synthetic (SS) maize populations are of particular significance because they serve as the model on which development of modern commercial hybrids are based. These populations are part of a reciprocal recurrent selection breeding strategy. With this strategy, plants from one population are crossed to plants from the opposite population (i.e. forming hybrids). These hybrids are tested, and the best ones are chosen. The plants crossed to form the chosen hybrids are identified and used to form the next generation in each population ...


The Effect Of Stress On Meiotic Recombination In Maize (Zea Mays L) , Luis A. Verde Jan 2003

The Effect Of Stress On Meiotic Recombination In Maize (Zea Mays L) , Luis A. Verde

Retrospective Theses and Dissertations

Plant genomes have the capacity to change in response to abiotic stress and other environmental signals. In maize (Zea mays L.), enhanced genetic recombination in response to low temperature has been shown to alter recombination frequencies in maize (Shams-UI-Islam, 1956). The effect of other environmental stresses on genetic recombination has not been reported in maize. Therefore, the primary objective of this dissertation was to identify whether water-deficit stress during meiosis and defoliation during pre-meiosis will affect meiotic recombination in maize. A secondary objective was to observe crossover occurrence and distribution. Three experiments are presented in this dissertation. The first two ...


Heterosis In A Broad Range Of Alfalfa Germplasm , Heathcliffe Riday Jan 2003

Heterosis In A Broad Range Of Alfalfa Germplasm , Heathcliffe Riday

Retrospective Theses and Dissertations

As part of an ongoing effort to implement a semi-hybrid breeding scheme Medicago sativa subsp. falcata genotypes from across the subspecies range were testcrossed to elite subsp. sativa populations to determine hybrid performance. The goal was to determine, which falcata germplasm created the most superior hybrids. Factors such as falcata parental morphology, molecular fragment differences, and climate of origin variables were used to group the falcata genotypes. European falcata germplasm displayed superior biomass yield and heterosis compared to Asian falcata germplasm. The superior European performance was likely due to genetic differentiation between European and Asian material. In addition climate of ...


Genetic Analysis Of Ear Length And Correlated Traits In Maize , Andrew Jon Ross Jan 2002

Genetic Analysis Of Ear Length And Correlated Traits In Maize , Andrew Jon Ross

Retrospective Theses and Dissertations

Maize (Zea mays L.) ear length is positively correlated with grain yield. Thirty generations of selection for increased ear length, however, failed to increase grain yield in Iowa Long-Ear Synthetic (BSLE). Negative correlations between ear length and other yield-related traits complicated indirect selection for grain yield. The main objective of this investigation was to identify quantitative trait loci (QTL) that affect the variation of ear length, grain yield, and other ear traits, and the correlations among traits. Secondary objectives were to validate QTL by comparing their genetic positions across generations, environments, and other populations. QTL were mapped in the F2 ...


Backcross Introgression And Two-Stage Testing For Conversion Of Improved Tropical Germplasm To Temperate Environments , Freeman Callaway Whitehead Jan 2002

Backcross Introgression And Two-Stage Testing For Conversion Of Improved Tropical Germplasm To Temperate Environments , Freeman Callaway Whitehead

Retrospective Theses and Dissertations

The use of exotic maize (Zea mays L.) germplasm, particularly of tropical and subtropical adaptation, has been suggested to increase genetic variability and grain yield of maize breeding material in temperate environments. Lack of adaptation to temperate areas and photoperiod sensitivity may mask desirable traits and reduce breeding progress. The objectives of this study included two-stage evaluation and selection of segregating families in the central U.S. Corn Belt derived from the backcross introgression of previously improved tropical CIMMYT germplasm into adapted, elite U.S. Corn Belt germplasm. The U.S. Corn Belt heterotic patterns of Stiff Stalk and non-Stiff ...


Quantitative Trait Loci For Soybean Seed Yield In Elite And Plant Introduction Germplasm , Matthew David Smalley Jan 2002

Quantitative Trait Loci For Soybean Seed Yield In Elite And Plant Introduction Germplasm , Matthew David Smalley

Retrospective Theses and Dissertations

Genetic improvement for yield in soybean [Glycine max (L.) Merrill] has been accomplished by breeding within a narrow elite gene pool. Plant introductions (PIs) may be useful for obtaining additional increases in yield if unique and desirable alleles at quantitative trait loci (QTL) can be identified. The objectives of the study were to identify QTL for yield in elite and PI germplasm and to determine if the PIs possessed favorable alleles for yield. Allele frequencies were measured with simple sequence repeat (SSR) markers in three populations that differed in their percentage of PI parentage. AP10 had 40 PI parents, AP12 ...


Association Of Reduced Phytate And Raffinose Saccharides With Agronomic And Seed Traits Of Soybean , Shane Jeremy Meis Jan 2002

Association Of Reduced Phytate And Raffinose Saccharides With Agronomic And Seed Traits Of Soybean , Shane Jeremy Meis

Retrospective Theses and Dissertations

The protein meal of soybean [Glycine max (L.) Merr.] lines homozygous for the mips allele (mips lines) has reduced phytate phosphorus and raffinose saccharides. Less phytate is desirable for reducing the phosphorus content of manure from non-ruminant animals and less raffinose saccharides increases the amount of metabolizable energy available to them. An objective of this study was to determine the association of the reduced raffinose saccharides and phytate phosphorus with agronomic and seed traits. A total of 48 F 3:5 mips lines with the same number of lines with the Mips Mips genotype (Mips lines) were compared in replicated ...