A5044203600- Weed Control and Herbicide Applications
- Pesticide and Herbicide Environmental Studies
- Allelopathy and phytotoxic interactions
- Plant tissue culture and regeneration
- Agronomic Practices and Intercropping Systems
- Turfgrass Adaptation and Management
- Legume Nitrogen Fixing Symbiosis
- Botany, Ecology, and Taxonomy Studies
- Nematode management and characterization studies
- Botany and Plant Ecology Studies
- Plant Parasitism and Resistance
- Muscle Physiology and Disorders
- Soybean genetics and cultivation
- Plant and animal studies
- Flowering Plant Growth and Cultivation
- Plant Diversity and Evolution
- Fungal Plant Pathogen Control
- Biological Control of Invasive Species
- Rangeland and Wildlife Management
- Seed and Plant Biochemistry
- Plant and fungal interactions
- Botanical Studies and Applications
- Fern and Epiphyte Biology
- Exercise and Physiological Responses
- Allergic Rhinitis and Sensitization
University of Guelph
2014-2024
Agriculture and Agri-Food Canada
2007-2023
Université Laval
1990-2018
CEA LITEN
2009-2015
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2001-2015
Hôtel-Dieu de Québec
2014
Michel-Sarrazin
2014
CEA Grenoble
2001-2009
CEA LETI
2001-2003
Hôpital de l'Enfant-Jésus
1997
A review of the biological information published after 1980 is provided for three species genus Amaranthus: A. retroflexus L., powellii S. Watson and hybridus L. The are noxious weeds introduced to Canada from southern North America. Their geographical distribution has remained almost unchanged since original paper in 1980. plants exhibit a high phenotypic plasticity genetic variability they easily adapt multitude agrestal ruderal habitats. seeds contribute persistent seed bank; variable...
The development of herbicide multiple‐resistance in weed species represents a major threat to current agricultural practices. mechanistic basis for has been investigated population the annual grass Lolium rigidum Gaud. (annual ryegrass) resistant herbicides affecting 6 target sites. A subset (R 2 subset) isolated by germination on medium containing acetyl‐CoA carboxylase (ACCase, EC 6.4.1.2) inhibiting herbicide, sethoxydim...
Myoblast transplantation is a potential treatment for Duchenne muscular dystrophy. One of the problems possibly responsible limited success clinical trials rapid death myoblasts after transplantation. To investigate this problem, expressing beta-galactosidase were injected in tibialis anterior muscles mice. Beta-galactosidase activity was reduced by 74.7% 3 days. observed at days to 57.2% when hosts irradiated. This result suggested that host cells contributing phenomenon. Transplantation...
• We investigated the effect of a herbicide resistance-conferring mutation on fitness in Amaranthus powellii. Morphological and histological observations were made. Growth leaf appearance recorded for six resistant susceptible populations. The competitiveness population was compared with that using replacement series experiment. Leaves plants distorted much smaller than those plants. Additionally, they exhibited an abnormal morphological structural pattern consisting mosaic heterogeneous...
Abstract Ambrosia artemisiifolia and trifida (Asteraceae) are important pest species the two greatest sources of aeroallergens globally. Here, we took advantage a hybrid to simplify genome assembly present chromosome‐level assemblies for both species. These show high levels completeness with Benchmarking Universal Single‐Copy Ortholog (BUSCO) scores 94.5% A. 96.1% long terminal repeat (LTR) Assembly Index values 26.6 23.6, respectively. The genomes were annotated using RNA data identifying...
This annual dioecious weed was found in 2002 and 2003 infesting soybean fields southwestern Ontario, it collected 1992 from waste places British Columbia. It is a major problem field crops the mid-western United States, where has become increasingly difficult to control during past 10 yr. Morphological differences between Amaranthus tuberculatus var. rudis are presented. A review of biological information published provided. Plants exhibit high phenotypic plasticity genetic variability....
A number of redroot pigweed and Powell amaranth populations from various locations in Ontario, Canada, have distinct patterns resistance to the acetolactate synthase–inhibiting herbicides imazethapyr thifensulfuron. This suggested presence diverse ALS gene mutations among these populations. Seven polymerase chain reaction primer pairs were used amplify obtain full sequence information determine identity resistance-conferring mutations. There was a high degree similarity two species with only...
Cuscuta spp. (dodders) are rootless, holoparasitic herbs with filiform stems attached to the host by numerous haustoria. In Canada, gronovii is most common native species of genus followed campestris and C. umbrosa. epithymum epilinum, both introduced in occur occasionally. Infestation can result serious yield losses dodders listed as noxious weeds British Columbia, Ontario Québec, restricted Alberta. These plants have evolved special adaptations ensure their success: germination occurs late...
Herbicide-resistant crops, such as glyphosate-resistant (GR) soybean, allow for broad-spectrum, flexible weed control with minimal crop injury; however, the development of GR weeds, horseweed, has forced reliance on alternative herbicides these weeds. While preplant (PP) provide excellent GR-horseweed, there are currently no POST herbicide options within soybean. The objective this study was to evaluate efficacy dicamba GR-horseweed when applied PP, POST, and sequentially in...
Abstract BACKGROUND The glyphosate‐resistant rapid response (GR RR) resistance mechanism in Ambrosia trifida is not due to target‐site (TSR) mechanisms. This study explores the physiology of and possibility reduced translocation vacuolar sequestration as non‐target‐site (NTSR) RESULTS GR RR leaf discs accumulated hydrogen peroxide within minutes glyphosate exposure, but only mature tissue. required energy either light or exogenous sucrose. combination phenylalanine tyrosine inhibited a...
Glyphosate-resistant (GR) giant ragweed has been confirmed in Ontario, Canada. Giant is an extremely competitive weed and lack of control soybean will lead to significant yield losses. Seed companies have developed new herbicide-resistant (HR) crop cultivars hybrids that stack multiple HR traits. The objective this research was evaluate the efficacy glyphosate plus dicamba tank mixes for GR under Ontario environmental conditions dicamba-tolerant (DT) soybean. Three field trials were...
Byker, H. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. 2013. Occurrence of glyphosate cloransulam resistant Canada fleabane ( Conyza canadensis L. Cronq.) in Ontario. Can. J. Plant Sci. 93: 851–855. is the second documented glyphosate-resistant (GR) weed species Ontario, Canada. In 2010, first eight GR populations were identified Essex County. 2011 2012, an expanded survey was conducted to identify occurrence cloransulam-resistant Seed collected from field...
Glyphosate-resistant (GR) Ambrosia trifida is now present in the midwestern United States and southwestern Ontario, Canada. Two distinct GR phenotypes are known, including a rapid response (GR RR) phenotype, which exhibits cell death within hours after treatment, non-rapid NRR) phenotype. The mechanisms of resistance both RR NRR remain unknown. Here, we description phenotype an investigation target-site on multiple A. accessions.Glyphosate was confirmed several accessions, whole-plant levels...
Byker, H. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. 2013. Control of glyphosate-resistant Canada fleabane [ Conyza canadensis (L.) Cronq.] with preplant herbicide tankmixes in soybean Glycine max . (L). Merr.]. Can. J. Plant Sci. 93: 659–667. Glyphosate previously provided excellent control fleabane; however, the evolution (GR) Ontario, alternative herbicides must be identified for this weed soybean. The objective study was to identify that provide...
Twelve populations of eastern black nightshade from different locations in Ontario are resistant to imazethapyr. This study aimed at determining the molecular basis resistance these and activity acetohydroxyacid synthase (AHAS) enzyme compared that sensitive AHAS response herbicides branched-chain amino acid concentration. The results partial sequencing indicated all had a cytosine 331 thymine substitution coding for an alanine 205 valine substitution. In vitro assays one population showed...
Vink, J. P., Soltani, N., Robinson, D. E., Tardif, F. J., Lawton, M. B. and Sikkema, P. H. 2012. Occurrence distribution of glyphosate-resistant giant ragweed ( Ambrosia trifida L.) in southwestern Ontario. Can. Plant Sci. 92: 533–539. Giant is the first confirmed (GR) weed Canada. A survey was conducted to document GR seed collected from 102 sites Essex (70), Chatham-Kent (21), Lambton (10) Waterloo counties (1) during autumn 2009 2010 prior soybean harvest. Plants were grown a growth room,...
Robinson, M. A., Letarte, J., Cowbrough, Sikkema, P. H. and Tardif, F. J. 2015. Winter wheat (Triticum aestivum L.) response to herbicides as affected by application timing temperature. Can. Plant Sci. 95: 325–333. Field studies were conducted determine the effects of cold temperatures physiological growth stage at time on tolerance winter 10 used in Ontario, Canada. Herbicides applied: early during a frost event (when forecasted ≤ 0°C); normal (Zadoks 21–29); late 39). Visible injury,...
Resistance to 2-methyl-4-chloro-phenoxyacetic acid (MCPA) was recently confirmed in a population of green pigweed (Amaranthus powellii) from Dresden, Ontario, Canada, with resistance factor 4.4. synthetic auxin herbicides Amaranthus species has previously been linked non-target site mechanisms low-level factors (<10). Based on this information an investigation into the mechanism MCPA conducted pigweed. No significant differences absorption, translocation, and metabolism 14 C-MCPA existed...
Field studies were conducted in 1996 and 1997 at three locations throughout southern Ontario with the objective of developing dose-response curves RPA 201772 for weed control crop tolerance corn. The biologically effective doses required to redroot pigweed, velvetleaf, wild mustard 100, 90, 80 g/ha, respectively. Yellow foxtail was controlled 100 120 while rates common lambsquarters varied from 60 130 depending on year location. Wild buckwheat poor (> 30%) all tested. did not reduce corn...