A5019307603- Wheat and Barley Genetics and Pathology
- Genetics and Plant Breeding
- Genetic Mapping and Diversity in Plants and Animals
- Genetically Modified Organisms Research
- Crop Yield and Soil Fertility
- Plant nutrient uptake and metabolism
- Insect Resistance and Genetics
- Plant tissue culture and regeneration
- Plant Pathogens and Fungal Diseases
- Genetic and phenotypic traits in livestock
- Plant pathogens and resistance mechanisms
- Insect-Plant Interactions and Control
- CRISPR and Genetic Engineering
- Agronomic Practices and Intercropping Systems
- Insect Pest Control Strategies
- Rice Cultivation and Yield Improvement
- Plant Pathogenic Bacteria Studies
- Plant Virus Research Studies
- Soil Carbon and Nitrogen Dynamics
- Transgenic Plants and Applications
- Weed Control and Herbicide Applications
- Plant Disease Resistance and Genetics
- Agricultural Innovations and Practices
- Legume Nitrogen Fixing Symbiosis
- Viral Infectious Diseases and Gene Expression in Insects
Colorado State University
2014-2023
Boston College
2004-2012
Teagasc - The Irish Agriculture and Food Development Authority
2011
Heriot-Watt University
2008
North Carolina State University
2000
International Rice Research Institute
2000
Agricultural Research Service
1996-1998
United States Department of Agriculture
1996-1998
University of Georgia
1998
University of Missouri
1989-1998
Interpretation of quantitative trait locus (QTL) studies agronomic traits is limited by lack knowledge biochemical pathways leading to expression. To more fully elucidate the biological significance detected QTL, we chose a that product well-characterized pathway, namely concentration maysin, C-glycosyl flavone, in silks maize, Zea mays L. Maysin host-plant resistance factor against corn earworm, Helicoverpa zea (Boddie). We determined silk maysin concentrations and restriction fragment...
Functional markers are needed for key genes involved in drought tolerance to improve selection crop yield under moisture stress conditions. The objectives of this study were (i) characterize five candidate genes, namely dehydration responsive element binding 1A ( DREB1A ), enhanced response abscisic acid ERA1‐B and ERA1‐D fructan 1‐exohydrolase 1‐FEH‐A 1‐FEH‐B wheat Triticum aestivum L.) nucleotide haplotype diversity, Tajima's D value, linkage disequilibrium (LD) (ii) associate within‐gene...
Plant breeders require genetic diversity to develop cultivars that are productive, nutritious, tolerant of biotic and abiotic stresses, make efficient use water fertilizer. The USDA‐ARS National Germplasm System (NPGS) is a major source for global plant resources (PGR), with accessions representing improved cultivars, breeding lines, landraces, crop wild relatives (CWR), coupled passport trait evaluation data. goal this article facilitate PGR in programs. Our specific objectives (i)...
• Sustainable agriculture is complex and includes multiple interdependent goals. Sound science innovation are the keys to sustainable agriculture, already delivering results. Greater investment needed in basics of agronomy, biotechnology, plant breeding ensure that farmers consumers everywhere benefit from technology. Farmers must receive support for implementing sustainability measures, especially light downward trend commodity prices.
Ideal maize ( Zea mays L.) cuitivars for tropical areas should yield well both in the presence and absence of drought, but optimal selection strategies accomplishing this goal are not dear. This study evaluated progress from two related populations across a broad range environmental conditions. ‘Tuxpeflo Sequia’ (TS) had undergone fuli‐sib recurrent eight cycles at one location under managed levels drought stress, while ‘Tuxpefio 1’ (T1) was selected six modified full‐sib scheme that relied...
The interpretation of quantitative trait locus (QTL) studies is limited by the lack information on metabolic pathways leading to most economic traits. Inferences about roles underlying genes with a pathway or nature their interaction other loci are generally not possible. An exception resistance corn earworm Helicoverpa zea (Boddie) in maize ( Zea mays L.) because maysin, C-glycosyl flavone synthesized silks via branch well characterized flavonoid pathway. Our results using synthesis as...
Heading date in wheat (Triticum aestivum L.) and other small grain cereals is affected by the vernalization photoperiod pathways. The reduced-height loci also have an effect on growth development. date, which occurs just prior to anthesis, was evaluated a population of 299 hard winter entries representative U.S. Great Plains region, grown nine environments during 2011-2012 2012-2013. germplasm for candidate genes at (Vrn-A1, Vrn-B1, Vrn-D1), (Ppd-A1, Ppd-B1 Ppd-D1), (Rht-B1 Rht-D1) using...
Phenotypic plasticity describes the range of phenotypes produced by a single genotype in different environments. We quantified extent phenotypic (evaluated as responsiveness to varying environmental conditions) thermal time heading and grain yield 299 hard winter wheat ( Triticum aestivum L.) genotypes from US Great Plains. The genotypes, which included advanced breeding lines recent historic cultivars, were evaluated 11 environments 2011–2012 2012–2013. average number days 1 January across...
Quantitative trait locus (QTL) analysis is a methodology that combines DNA marker and phenotypic data to locate characterize genes influence quantitative traits. This the second of two-part series describes methods uses QTL analysis. The Analysis 1 lesson discussed basic concepts involved, population development, evaluation. covers interpretation studies. Students completing this should be able to: Compare three analysis: single-factor variance, simple interval mapping, composite mapping....
Reduced height alleles at the Rht‐B1 and Rht‐D1 loci have been widely incorporated into wheat ( Triticum aestivum L.) cultivars with intent of improving partitioning assimilates to grain. Although generally effective increasing yield in high environments, their effects under heat drought stress variable. We undertook this study evaluate Rht‐B1b Rht‐D1b dwarfing a recombinant inbred line (RIL) spring population range soil moisture conditions. genotypes 140 RILs derived from cross between...
Core Ideas Great Plains winter wheat genotypes differed for root traits in a greenhouse study. Total length was negatively correlated with average diameter under moisture stress. Root deep the profile positively associated leaf relative water content. Semi‐dwarfing alleles did not significantly affect any system trait. Development of deep, extensive is drought adaptation mechanism that beneficial maintaining productivity scarcity dryland cropping systems. To determine variation biomass,...
Abstract C-glycosyl flavones in maize silks confer resistance (i.e., antibiosis) to corn earworm (Helicoverpa zea [Boddie]) larvae and are distinguished by their B-ring substitutions, with maysin apimaysin being the di- monohydroxy forms, respectively. Herein, we examine genetic mechanisms underlying synthesis of corresponding effects on larval growth. Using an F2 population, found a quantitative trait locus (QTL), rem1, which accounted for 55.3% phenotypic variance maysin, QTL, pr1,...
Growth of the corn earworm (Helicoverpa zea Boddie), a major pest maize (Zea mays L.), is inhibited by high concentrations maysin, C-glycosyl flavone, in silks. To advance understanding genetic control silk maysin concentration and antibiosis to earworm, we conducted quantitative trait locus (QTL) study population derived from cross high-maysin (GE37) Iowmaysin (FF8) lines. Both lines have phenotypically identical, functional alleles at pl locus, regulator biochemical pathway leading...
ABSTRACT Russian wheat aphid (RWA), Diuraphis noxia (Kurdjumov), is a significant insect pest of ( Triticum aestivum L.) and has had major economic impact worldwide, especially on winter in the western United States. Development resistant cultivars remains most viable method for RWA control, although continuing emergence new biotypes virulent to deployed resistance genes reinforces need discovery sources resistance. Iranian landrace accession PI 626580 shown high levels 1 (RWA1) 2 (RWA2),...
Wheat streak mosaic virus (WSMV) can cause significant yield loss in wheat ( Triticum aestivum L.) the Great Plains of North America. A recently identified WSMV resistance gene, Wsm2 , was mapped to chromosome 3BS germplasm line ‘CO960293–2’. Effective genetic markers tightly linked gene will enhance selection WSMV‐resistant lines through marker‐assisted selection. We have using a high‐density map developed from 90K Infinium iSelect single‐nucleotide polymorphism (SNP) array with recombinant...
Selenium is essential for many organisms, but toxic at higher levels. To investigate the genetic basis of selenate tolerance in Arabidopsis thaliana, quantitative trait loci (QTL) associated with accessions Landsberg erecta and Columbia were mapped using recombinant inbred lines (RILs). The index (TI(D10) = root growth + 30 microm selenate/root control x 100%) was fourfold parental line Col-4 (59%) than parent Ler-0 (15%). Among 96 F8 RILs, TI(D10) ranged from 11 to 75% (mean 37%). Using...