A5049478170- Rangeland and Wildlife Management
- Turfgrass Adaptation and Management
- Wheat and Barley Genetics and Pathology
- Plant Water Relations and Carbon Dynamics
- Plant Taxonomy and Phylogenetics
- Plant Disease Resistance and Genetics
- Legume Nitrogen Fixing Symbiosis
- Climate change and permafrost
- Bioenergy crop production and management
- Chromosomal and Genetic Variations
- Ruminant Nutrition and Digestive Physiology
- Soil Carbon and Nitrogen Dynamics
- Atmospheric and Environmental Gas Dynamics
- Plant nutrient uptake and metabolism
- Ecology and Vegetation Dynamics Studies
- Agronomic Practices and Intercropping Systems
- Crop Yield and Soil Fertility
- Botany, Ecology, and Taxonomy Studies
- Genetic Mapping and Diversity in Plants and Animals
- Genomics and Phylogenetic Studies
- Biofuel production and bioconversion
- Seed Germination and Physiology
- Genetics and Plant Breeding
- Botany and Plant Ecology Studies
- Pasture and Agricultural Systems
Utah State University
2012-2023
University of Ottawa
2011-2022
Agricultural Research Service
2004-2019
United States Department of Agriculture
2010-2019
Virginia Commonwealth University
2010
Agriculture and Agri-Food Canada
1997-2010
Ottawa Research and Development Centre
2007-2010
Veterans Health Administration
2010
Draper Laboratory
2005
Arkansas Agricultural Experiment Station
2003
Neutrophils roll on P-selectin expressed by activated platelets or endothelial cells under the shear stresses in microcirculation. glycoprotein ligand-1 (PSGL-1) is a high affinity ligand for myeloid cells. However, it has not been demonstrated that PSGL-1 contributes to rolling of neutrophils P-selectin. We developed two IgG mAbs, PL1 and PL2, appear recognize protein-dependent epitopes human PSGL-1. The mAbs bound all leukocytes as well heterologous transfected with cDNA. PL1, but blocked...
SUMMARY (3) In deciduous shrubs, up to 14%. of the total plant capital nitrogen and phosphorus was translocated from stems large roots into leaves during 3 weeks following snow-melt. The amount in not fully replaced by uptake until late autumn. At this time, 50-60%0 which had been removed. contrast, evergreen shrub gradually throughout growing season, showed no evidence stores nutrients or roots. By August 46% shrubs present leaves. (4) Potassium effectively back-translocated species...
Chilling temperatures increase the amounts of potentially lethal toxic oxygen compounds present within plants. These can be scavenged by antioxidant such as ascorbate and β‐carotene. Three developmental stages (first, third fifth leaf) four inbred lines maize ( Zea mays L.) exhibiting differential sensitivity to chilling were examined in order determine if chilling‐sensitive line had lower concentrations than did tolerant lines. Plants exposed one three treatments: (1) control (25°C...
(Pyrimidine)n . (purine)n DNAs of repeating sequences form a distinctive complex on lowering the pH below 6. Previously this was thought to be tetra-stranded. The present work is inconsistent with view, and four lines evidence show that consists triplex together poly d(purine) possessing secondary structure. Formula: (see text). (a) S1 nuclease digestion leads degradation 50% content 5-induced complex. (b) Buoyant density studies demonstrate there no interaction between added free also...
Near‐isogenic lines that contrast in the presence or absence of glaucousness were developed durum wheat ( Triticum turgidum L. group) and common T. aestivum L.) grown plots three field environments varying soil water availability. The glaucous selections yielded significantly more grain dry matter than non‐glaucous two higher yielding but not very environment where average yield was 66 gm ‐2 . No differences within between found extraction patterns. Furthermore, leaf potentials determined at...
Glaucousness, which is the visual manifestation of epicuticular wax, has previously been found to increase yield grain and dry matter droughted wheat. This study was designed, first, monitor development wax in a pair durum (Triticum turgidum L. var. durum) wheats isogenic for glaucousness and, second, determine likely reasons increased yields glaucous common (T. aestivum L.) over their non-glaucous counterparts. Glaucousness first appears on leaf sheath at time stem elongation. It rapidly...
Antioxidant enzyme activities were determined at the first, third and fifth leaf stages of four inbred lines maize (Zea mays L.) exhibiting differential sensitivity to chilling. Plants exposed a photoperiod 16:8 L:D for one three treatments: (a) control (25°C), (b) treatment plus an exposure short-term chilling shock (11°C 1 d prior harvesting), (c) long-term (11 °C constant) exposure. Catalase (CAT; EC 1.11.1.6), ascorbate peroxidase (ASPX; 1.11.1.11), superoxide dismutase (SOD; 1.15.1.1),...
Carbon isotope discrimination (∆) has been shown to be negatively related water use efficiency (WUE) in several C 3 crop species and proposed as a criterion select for improved WUE plant breeding programs. This study was conducted determine if ∆ is crested wheatgrass [ Agropyron desertorum (Fischer ex Link) Schultes] AItai wildrye Leymus angustus (Trin.) Pilger] evaluate the influence of drought on magnitude genetic variability broad‐sense heritability among clones wheatgrass. In greenhouse...
SUMMARY (1) The seasonal patterns of carbohydrate, lipid, cellulose, hemicellulose and lignin were examined in plants major tundra growth forms: deciduous shrub, evergreen forb, tussock graminoid, moss lichen. (2) Stems shrubs (Salix pulchra Betula nana) forb (Rubus chamaemorus) showed well-developed over-winter carbohydrate storage, with concentrations increasing autumn declining spring, coincident initiation leaf root growth. shrub (Ledum palustre) little fluctuation carbohydrates stems...
Squirreltail[Elymus elymoides (Raf.)Swezey] is a native coolseason grass that has been observed to invade rangelands dominated by the weedy annual grasses, cheatgrass (Bromus tectorum L.) and medusahead wildrye [Taeniatherum caput-medusae (L.) Nevski].Our objective was determine if growth characteristics could account for this squirreltail trait.We used analysis examine differences in seedling tissue allocation of 5 entries, 2 long-lived perennial grasses ('Golda?bluebunch wheatgrass...
The 5S rRNA gene of the soybean Glycine max (L.) Merr. has been cloned on a 556-bp fragment DNA and sequenced. This contains two copies rDNA sequence, one intact truncated, separated by noncoding DNA. We have used this clone to investigate organization genes within genome extent their methylation. Our results demonstrate that are clustered, organized into tandem repeats 330 bp, extensively methylated. Hybridization sequence Southern transfers digested with BamHI reveals striking ladderlike...
The mechanisms responsible for soil-N-mediated species replacement of native perennial grasses by the invasive annual cheatgrass (Bromus tectorum L.) and medusahead (Taeniatherum caput-medusae [L.] Nevski) on rangelands are not completely understood.In addition, contributions distinct forms inorganic N (i.e., NH4+ N03') to these shifts in composition currently unclear.Consequently, we con- ducted a greenhouse experiment test 2 hypotheses: l) that low availability reduces growth (root shoot)...
Rapid seedling growth and ability to compete against cheatgrass (Bromus tectorzun L.) are 2 characteristics that perennial grasses must have for successful establishment on semiarid western rangelands.This study was conducted determine the effects of temperature competition from root shoot 'Hycrest'crested wheatgrass [Agropyron deserforum (Fisch.ex Link) Schult.X A. cristuruur (L.) Gaert.] 'Whitmar'bluebunch (Pseudoroegneriaspicata(Pursh) Eve].For study, seedlings were grown in chambers with...
Carbon isotope discrimination (Δ) has been proposed as a criterion in selecting for water‐use efficiency (WUE) C 3 crop species. This study was conducted to determine associations among Δ, leaf instantaneous WUE (WUE i ), and shoot ) clones of crested wheatgrass [ Agropyron desertorum (Fischer ex Link) Schultes] previously selected low, medium, high Δ. Nine (three each Δ class) were grown greenhouse pots weighed every third day brought either 0.03 or 0.12 kg −1 gravimetric water content....