A5047422501- Magnetic and Electromagnetic Effects
- Plant Molecular Biology Research
- Plant Reproductive Biology
- Plant nutrient uptake and metabolism
- Spaceflight effects on biology
- Light effects on plants
- Plant Stress Responses and Tolerance
- Plant tissue culture and regeneration
- Planetary Science and Exploration
- Aluminum toxicity and tolerance in plants and animals
- Polysaccharides and Plant Cell Walls
- Seed Germination and Physiology
- Plant Genetic and Mutation Studies
- Plant Micronutrient Interactions and Effects
- Plant and animal studies
- Plant and Biological Electrophysiology Studies
- Microtubule and mitosis dynamics
- Biocrusts and Microbial Ecology
- Protist diversity and phylogeny
- Tree Root and Stability Studies
- Insect and Arachnid Ecology and Behavior
- Plant Surface Properties and Treatments
- Plant responses to water stress
- Photoreceptor and optogenetics research
- Plant and fungal interactions
University of Louisiana at Lafayette
2015-2024
Berthold (Australia)
2008
Southwestern University
1990-1999
Sewanee: The University of the South
1996
The Ohio State University
1986-1988
San Diego State University
1984
We examined the influence of aluminum and calcium (and certain other cations) on hormone transport in corn roots. When was applied unilaterally to caps 15 mm apical root sections roots curved strongly away from aluminum. cap 3H-indole-3-acetic acid basal cut surface twice as much radioactivity (assumed be IAA) accumulated concave side convex side. Auxin region intact preferentially basipetal, with a polarity (basipetal divided by acropetal transport) 6.3. In decapped 5 segments, auxin...
1 Salinization is a growing environmental stress in wetland ecosystems world-wide. Several models have been proposed that predict clonal plant responses to stress, including stimulates sexual reproduction. 2 We conducted common-garden experiment investigate the effects of salinity on 10 natural populations Iris hexagona, perennial endemic freshwater and brackish wetlands North American Gulf Coast. 3 Salinity reduced vegetative growth but either increased or had neutral reproduction,...
Abstract N-Acylethanolamines (NAEs) are bioactive acylamides that present in a wide range of organisms. In plants, NAEs generally elevated desiccated seeds, suggesting they may play role seed physiology. NAE and abscisic acid (ABA) levels were depleted during germination, both metabolites inhibited the growth Arabidopsis thaliana seedlings within similar developmental window. Combined application low ABA produced more dramatic reduction germination than either compound alone. Transcript...
To determine whether actin microfilament (MF) organization is correlated with differential elongation, primary roots of Zea mays cv Merit maintained vertically or reoriented horizontally for 15 to 120 min were stained rhodamine phalloidin and examined a confocal microscope. Root curvature was measured computer-controlled video digitizer. In vertical bundles MFs in the elongation maturation zone oriented parallel longitudinal axis cells. vascular parenchyma cells more abundant than cortex...
Gravitropic sensing in stems and stem-like organs is hypothesized to occur the endodermis. However, since endodermis runs entire length of stem, precise site gravisensing has been difficult define. In this investigation gravisensitivity inflorescence Arabidopsis, we positioned a high gradient magnetic field (HGMF) on rotating clinostat. Approximately 40% young, wild-type (WT) inflorescences, for all positions tested, curved toward HGMF vicinity stem exposed field. contrast, when wedge was...
Moniliophthora perniciosa is the causative agent of witches' broom disease in Theobroma cacao. Exogenously provided abscisic acid (ABA), indole-3-acetic (IAA), jasmonic (JA), and salicylic (SA) promoted mycelial growth, suggesting ability pathogen to metabolize plant hormones. ABA, IAA, JA, SA were found endogenously mycelium fruiting body pathogen. The contained high amounts (0.5+/-0.04 microg g(-1) DW) IAA (2+/-0.6 basidiocarps. Growth presence host leaves for 10 days did not affect ABA or...
Nanograined (NG)/ultrafine-grained (UFG)structures show enhanced cellular response of pre-osteoblasts. Cell proliferation, viability, and morphology on phase-reversion annealed NG/UFG austenitic stainless steel were observed to be favorably modulated in comparison conventional coarse-grained steel. The improvement is ascribed structure hydrophilicity the cell substrate.
Coleoptiles of barley (Hordeum vulgare) were positioned in a high gradient magnetic field (HGMF, dynamic factor H2/2 109−1010 Oe2 cm−1), generated by ferromagnetic wedge uniform field) and rotated on 1 rpm clinostat. After 4 h 90% coleoptiles had curved toward the HGMF. The cells affected HGMF showed clear intracellular displacement amyloplasts. next to non-ferromagnetic no preferential curvature. small size area non-uniformity allowed mapping sensitivity varying initial position relative...
Previous work has shown that microtubule (MT) reorientation follows the onset of growth inhibition on lower side graviresponding roots, indicating reduction can occur independently MT reorientation. To test this observation further, we examined whether in response to osmotic stress is correlated with The distribution and rate maize roots exposed 350 mOsm sorbitol KCl or 5 mM Mes/Tris buffer were measured a digitizer. After various times processed for indirect immunofluorescence microscopy....
Wetland habitats are besieged by biotic and abiotic disturbances such as invasive species, hurricanes, habitat fragmentation, salinization. Predicting how these factors will alter local population dynamics community structure is a monumental challenge. By examining ecologically similar congeners, Iris hexagona I. pseudacorus (which reproduce clonally sexually tolerate wide range of environmental conditions), one can identify life-history traits that most influential to growth viability. We...
Sorghum (Sorghum bicolor (L.) Moench) is a high-yielding, stress tolerant energy crop for lignocellulosic-based biofuel production. Saccharification process by which hydrolytic enzymes break down lignocellulosic materials to fermentable sugars production, and mapping identifying genes underlying saccharification yield an important first step genetically improve the plant higher productivity. In this study, we used ICRISAT sorghum mini core germplasm collection 14 739 single nucleotide...
Abstract Vertical orientation of emerging roots typically is the first response plants to gravity. Although root gravitropism has been studied extensively, no conclusive data on onset gravisensing exist. We determined inception gravisensitivity in flax (Linum usitatissimum) by clinorotating germinating seeds after various periods static (gravistimulation) imbibed seeds. Gravitropic competency was established about 8 h imbibition, 11 prior germination. The time based 50% newly emerged curving...
We used five cultivars of Zea mays (Bear Hybrid WF9 * 38MS, B73 Missouri 17, Yellow Dent, Merit, and Great Lakes 422) to reinvestigate the specificity metal ions for inducing root curvature. Of 17 cations tested, 6 (Al3+, Ba2+, Ca2+, Cd2+, Cu2+, Zn2+) induced Roots curved away from Al3+, Cd2+. low (0.1 millimolar) concentrations Cu2+ but toward higher (1-5 concentrations. initially Zn2+ direction subsequent curvature was unpredictable. In most cases, roots all towards calcium. However, in...
Lactuca sativa cv. Baijianye seedlings do not normally produce lateral roots, but removal of the root tip or application auxin, especially indole‐butyric acid, triggered formation roots. Primordia initiated within 9 h and were fully developed after 24 by activating pericycle cells opposite xylem pole. The divided asymmetrically into short long cells. further to form primordia. effect auxin was reversed 6‐benzylaminopurine at concentrations >10−8 M. cytokinin oxidase inhibitor...