A5027041964- Weed Control and Herbicide Applications
- Pesticide and Herbicide Environmental Studies
- Plant tissue culture and regeneration
- Allelopathy and phytotoxic interactions
- Legume Nitrogen Fixing Symbiosis
- Agronomic Practices and Intercropping Systems
- Chromosomal and Genetic Variations
- Plant Virus Research Studies
- Bioenergy crop production and management
- Biological Control of Invasive Species
- Plant Molecular Biology Research
- Nematode management and characterization studies
- Soil Carbon and Nitrogen Dynamics
- Plant Parasitism and Resistance
- CRISPR and Genetic Engineering
- Plant nutrient uptake and metabolism
- Plant Pathogens and Resistance
- Plant and animal studies
- Plant Pathogens and Fungal Diseases
- Garlic and Onion Studies
- Plant and fungal interactions
- Seedling growth and survival studies
- Plant Reproductive Biology
- Turfgrass Adaptation and Management
- Smart Agriculture and AI
Kansas State University
2016-2025
University of Guelph
2001-2012
Significance Glyphosate is a nonselective herbicide used around the globe for weed control in glyphosate-resistant (GR) and noncrop situations. The extensive exclusive use of glyphosate has led to evolution resistance many crop weeds. molecular target glyphosate, 5-enolpyruvlyshikimate-3-phosphate synthase ( EPSPS ) gene, confers upon amplification was first documented GR Amaranthus palmeri . We now report that amplified copies A. are present form extrachromosomal circular DNA molecules...
Auxinic herbicides are widely used for control of broadleaf weeds in cereal crops and turfgrass. These structurally similar to the natural plant hormone auxin, induce several same physiological biochemical responses at low concentrations. After decades research understand auxin signal transduction pathway, receptors binding resultant have recently been discovered plants. However, precise mode action auxinic is not completely understood despite their extensive use agriculture over six...
Herbicide resistance in crops has extended the scope of herbicide applications to control weeds. The introduction resistant resulted a major shift way that herbicides are used many crops, but not necessarily increased prevalence use, especially wheat. Wheat is one most widely grown world and currently only two herbicide-resistant wheat groups have been commercialized manage weeds cost-effective manner. However, sustainable production threatened by expanding occurrence weed populations with...
Abstract Several grass and broadleaf weed species around the world have evolved multiple-herbicide resistance at alarmingly increasing rates. Research on biochemical molecular mechanisms of multiple-resistant populations indicate a prevalence herbicide metabolism catalyzed by enzyme systems such as cytochrome P450 monooxygenases glutathione S -transferases and, to lesser extent, glucosyl transferases. A symposium was conducted gain an understanding current state research metabolic in that...
Abstract Weeds are attractive models for basic and applied research due to their impacts on agricultural systems capacity swiftly adapt in response anthropogenic selection pressures. Currently, a lack of genomic information precludes elucidate the genetic basis rapid adaptation important traits like herbicide resistance stress tolerance effect evolutionary mechanisms wild populations. The International Weed Genomics Consortium is collaborative group scientists focused developing resources...
Herbicide efficacy is known to be influenced by temperature, however, underlying mechanism(s) are poorly understood. A marked alteration in mesotrione [a 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor] on Palmer amaranth (Amaranthus palmeri S. Watson) was observed when grown under low- (LT, 25/15 °C, day/night temperatures) and high (HT, 40/30° C) temperature compared optimum (OT, 32.5/22.5 °C) temperature. Based plant height, injury, mortality, more sensitive at LT less HT OT (ED50...
Palmer amaranth (Amaranthus palmeri) is an economically troublesome, aggressive and damaging weed that has evolved resistance to six herbicide modes of action including photosystem II (PS II) inhibitors such as atrazine. The objective this study was investigate the mechanism inheritance atrazine in amaranth.A population from Kansas (KSR) had a high level (160 - 198-fold more; SE ±21 26) compared two known susceptible populations MSS KSS, Mississippi Kansas, respectively. Sequence analysis...
Herbicides that inhibit hydroxyphenylpyruvate dioxygenase (HPPD) such as mesotrione are widely used to control a broad spectrum of weeds in agriculture. Amaranthus palmeri is an economically troublesome weed throughout the United States (US). The first case evolution resistance HPPD-inhibiting herbicides A. was documented Kansas (KS) and later Nebraska (NE). objective this study investigate mechansim HPPD-inhibitor (mesotrione) palmeri. Dose response analysis revealed population (KSR) 10-18...
Synthetic auxins such as 2,4-dichlorophenoxyacetic acid (2,4-D) have been widely used for selective control of broadleaf weeds since the mid-1940s. In 2009, an Amaranthus tuberculatus (common waterhemp) population with 10-fold resistance to 2,4-D was found in Nebraska, USA. The mechanism examined by conducting [14 C] absorption, translocation and metabolism experiments.No differences were absorption or between resistant susceptible A. plants. Resistant plants metabolized more rapidly than...
Palmer amaranth is the most problematic weed in agronomic crop production fields United States. A biotype was not controlled with sequential applications of glyphosate glyphosate-resistant (GR) soybean field south-central Nebraska. The seeds putative GR were collected fall 2015. objectives this study to (1) confirm and determine level resistance a whole-plant dose-response bioassay, (2) copy number 5-enolpyruvylshikimate-3-phosphate (EPSPS) gene, molecular target glyphosate, (3) evaluate...
Evolution of multiple herbicide resistance in Palmer amaranth across the United States is a serious challenge for its management. Recently, population (KCTR; Kansas Conservation Tillage Resistant) from long-term conservation tillage research project Kansas, States, was found uncontrolled by several commonly used herbicides. Importantly, this field did not have history repeated use some herbicides which KCTR showed lack control. The objectives study were to confirm evolution resistances and...
Evolution of multiple herbicide resistance in weeds is a serious threat to weed management crop production. Kochia an economically important broadleaf the U.S. Great Plains. This study aimed confirm four sites action herbicides single kochia (Kochia scoparia L. Schrad.) population from field near Garden City (GC), Kansas, and further determine underlying mechanisms resistance.One-fourth GC plants survived labeled rate or higher atrazine [photosystem II (PSII) inhibitor], surviving had...
Resistance to acetolactate synthase (ALS)-inhibitor herbicides due continuous and repeated selection is widespread in many troublesome weed species, including Palmer amaranth, throughout the United States. The objective of this research was investigate physiological molecular basis resistance ALS inhibitors a chlorsulfuron-resistant amaranth population (KSR). Our results indicate that KSR exhibits high level chlorsulfuron compared with two known susceptible populations, MSS KSS from...
Recent and rapid evolution of resistance to glyphosate, the most widely used herbicides, in several weed species, including common waterhemp (Amaranthus tuberculatus), poses a serious threat sustained crop production. We report that glyphosate A tuberculatus was due amplification 5-enolpyruvylshikimate-3-P synthase (EPSPS) gene, which encodes molecular target glyphosate. There positive correlation between EPSPS gene copies its transcript expression. analyzed distribution genome using...
Abstract There is a need to investigate how cultural practices used during the establishment of zoysiagrasses ( Zoysia Willd. species) from sprigs affects thatch accumulation critical period and post‐harvest health this species. A field study was conducted in Olathe, KS, 2021 2023 evaluate nitrogen (N) rates (77 kg N ha −1 or 175 year ) mowing height (1.9 3.8 cm cut beginning second year) influence turf quality, prior harvest, root strength newly sodded genotypes grown sprigs. Average...
Waterhemp is an increasingly problematic weed in the U.S. Midwest, having now evolved resistances to herbicides from six different site-of-action groups. Glyphosate-resistant waterhemp Midwest especially concerning given economic importance of glyphosate corn and soybean production. Amplification target-site gene, 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) was found be mechanism resistance Palmer amaranth, a species closely related waterhemp. Here, relationship between EPSPS gene...
Abstract BACKGROUND Resistance to the synthetic auxin herbicide dicamba is increasingly problematic in Kochia scoparia . The resistance mechanism an inbred dicamba‐resistant K. line (9425R) was investigated using physiological and transcriptomics (RNA‐Seq) approaches. RESULTS No differences were found absorption or metabolism between 9425R a dicamba‐susceptible line, but have significantly reduced translocation. Known auxin‐responsive genes ACC synthase ( ACS ) indole‐3‐acetic acid amino...
Glyphosate and 2,4-D have been commonly used for control of common giant ragweed before planting corn soybean in the midwestern United States. Because these herbicides are primarily applied early spring, environmental factors such as temperature may influence their efficacy. The objectives this study were to (1) evaluate on efficacy or glyphosate level resistance (2) determine underlying physiological mechanisms (absorption translocation). Glyphosate-susceptible (GS) glyphosate-resistant...