A5036724519- Weed Control and Herbicide Applications
- Plant tissue culture and regeneration
- Pesticide and Herbicide Environmental Studies
- Legume Nitrogen Fixing Symbiosis
- Allelopathy and phytotoxic interactions
- Nematode management and characterization studies
- Agronomic Practices and Intercropping Systems
- Seed and Plant Biochemistry
- Plant Virus Research Studies
- Plant Pathogens and Resistance
- Photosynthetic Processes and Mechanisms
- Genetically Modified Organisms Research
- Genetic and Environmental Crop Studies
- Plant Parasitism and Resistance
- Chromosomal and Genetic Variations
- Plant and animal studies
- Plant-Microbe Interactions and Immunity
- Genetic Mapping and Diversity in Plants and Animals
- Genetic diversity and population structure
- Bioenergy crop production and management
- Plant Disease Resistance and Genetics
- Biological Control of Invasive Species
- Insect Resistance and Genetics
- GABA and Rice Research
- Cassava research and cyanide
University of Illinois Urbana-Champaign
2016-2025
Goodwin College
1998-2020
ORCID
2016
Alternating Hemiplegia of Childhood Foundation
2015
Purdue University West Lafayette
2010
Agricultural Research Service
2008
Urbana University
2001-2005
Michigan State University
1995-1996
Washington State University
1993
Herbicides that target the enzyme acetolactate synthase (ALS) are among most widely used in world. Unfortunately, these herbicides also notorious for their ability to select resistant (R) weed populations. Now, there more species ALS-inhibiting than any other herbicide group. In cases, resistance is caused by an altered ALS enzyme. The frequent occurrence of populations inhibitors can be attributed widespread usage herbicides, how they have been used, strong selection pressure exert, and...
The herbicide glyphosate became widely used in the United States and other parts of world after commercialization glyphosate-resistant crops. These crops have constitutive overexpression a glyphosate-insensitive form target site gene, 5-enolpyruvylshikimate-3-phosphate synthase ( EPSPS ). Increased use over multiple years imposes selective genetic pressure on weed populations. We investigated recently discovered Amaranthus palmeri populations from Georgia, comparison with normally sensitive...
Herbicides that act by inhibiting protoporphyrinogen oxidase (PPO) are widely used to control weeds in a variety of crops. The first weed evolve resistance PPO-inhibiting herbicides was Amaranthus tuberculatus, problematic the midwestern United States previously had evolved multiple resistances two other target sites. Evaluation PPO-inhibitor-resistant A. tuberculatus biotype revealed (incompletely) dominant trait conferred single, nuclear gene. Three genes predicted encode PPO were...
As cases of resistance to herbicides escalate worldwide, there is increasing demand from growers test for weed and learn how manage it. Scientists have developed resistance-testing protocols numerous species. Growers need immediate answers scientists are faced with the daunting task testing an increasingly large number samples across a variety species herbicides. Quick tests been, continue be, address this need, although classical still norm. Newer methods involve molecular techniques....
Abstract Previous research reported the first case of resistance to mesotrione and other 4-hydroxyphenylpyruvate dioxygenase (HPPD) herbicides in a waterhemp (Amaranthus tuberculatus) population designated MCR (for McLean County mesotrione- atrazine-resistant). Herein, experiments were conducted determine if target site or nontarget mechanisms confer MCR. Additionally, basis for atrazine was investigated an atrazine-resistant but mesotrione-sensitive (ACR Adams A standard sensitive (WCS...
Abstract BACKGROUND Understanding and managing the evolutionary responses of pests pathogens to control efforts is essential human health survival. Herbicide‐resistant ( HR ) weeds undermine agricultural sustainability, productivity profitability, yet epidemiology resistance evolution – particularly at landscape scales poorly understood. We studied glyphosate in a major weed, Amaranthus tuberculatus (common waterhemp), using landscape, weed management data from 105 central Illinois grain...
The widespread occurrence of ALS inhibitor- and glyphosate-resistant Amaranthus palmeri has led to increasing use protoporphyrinogen oxidase (PPO)-inhibiting herbicides in cotton soybean. Studies were conducted confirm resistance fomesafen (a PPO inhibitor), determine the frequency, examine profile other foliar-applied investigate mechanism resistant plants a population collected 2011 (AR11-LAW B) its progenies from two cycles selection (C1 C2).The frequency fomesafen-resistant increased 5%...
A population of waterhemp in a seed maize production field central Illinois, United States, was not adequately controlled after post-emergence applications herbicides that inhibit 4-hydroxyphenylpyruvate dioxygenase (HPPD).Progeny from the survived following treatment with mesotrione, tembotrione or topramezone applied to foliage either alone combination atrazine greenhouse experiments. Dose-response experiments indicated level resistance HPPD inhibitor mesotrione is at least tenfold...
Synthetic herbicides have been used globally to control weeds in major field crops. This has imposed a strong selection for any trait that enables plant populations survive and reproduce the presence of herbicide. Herbicide resistance must be minimized because it is limiting factor food security global agriculture. represents huge challenge will require great research efforts develop strategies as alternatives dominant almost exclusive practice weed by herbicides. Weed scientists, ecologists...
The selection pressure exerted by herbicides has led to the repeated evolution of herbicide resistance in weeds. on contemporary timescales turn provides an outstanding opportunity investigate key questions about genetics adaptation, particular relative importance adaptation from new mutations, standing genetic variation, or geographic spread adaptive alleles through gene flow. Glyphosate-resistant Amaranthus tuberculatus poses one most significant threats crop yields Midwestern United...
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...
A common waterhemp biotype that was not controlled by triazine or acetolactate synthase (ALS)-inhibiting herbicides isolated from a field in Bond County, IL, the fall of 1996. Greenhouse and laboratory experiments determined resistance to atrazine three ALS-inhibiting this biotype. Based on whole-plant response, County required over 1,000 times more imazethapyr relative susceptible reduce growth 50%. Cross-resistance thifensulfuron, sulfonylurea, flumetsulam, triazolopyrimidine...
A population of waterhemp was identified in Adams County, Illinois, that survived treatment several acetolactate synthase (ALS) inhibitors and a postemergence (POST) application lactofen, protoporphyrinogen oxidase (PPO)–inhibiting herbicide. Greenhouse studies were conducted to quantify the responses this population, designated ACR, multiple PPO various other herbicides with different sites action. Resistance ratios obtained by comparing herbicide dose–response curves between ACR...
Abstract BACKGROUND: The de novo transcriptome sequencing of a weedy plant using GS‐FLX 454 technologies is reported. Horseweed ( Conyza canadensis L.) was the first broadleaf weed to evolve glyphosate resistance in agriculture, and also most widely distributed glyphosate‐resistant United States world. However, available sequence data for this species are scant. transcriptomic should be useful gene discovery, help elucidate non‐target‐based mechanism genomic basis weediness. RESULTS:...
In 2006 and 2007, farmers from two counties in Illinois reported failure to control waterhemp with glyphosate. Subsequent onsite field experiments revealed that the populations might be resistant multiple herbicides. Greenhouse therefore were conducted confirm glyphosate resistance, test for resistance other herbicides, including atrazine, acifluorfen, lactofen, imazamox. dose-response experiments, both responded similarly a previously characterized glyphosate-resistant population (MO1)....
Abstract BACKGROUND: Waterhemp is a model for weed genomics research in part because it possesses many interesting biological characteristics, rapidly evolves resistance to herbicides and has solid foundation of previous genetics work. To develop further the resources waterhemp, transcriptome was sequenced using Roche GS‐FLX 454 pyrosequencing technology. RESULTS: Pyrosequencing produced 483 225 raw reads, which, after quality control assembly, yielded 44 469 unigenes (contigs + singletons)....
Resistance to herbicides occurs in weeds as the result of evolutionary adaptation (Jasieniuk et al. 1996). Basically, two types mechanisms are involved resistance (Beckie and Tardif 2012; Délye 2013). Target-site (TSR) is caused by changes tridimensional structure herbicide target protein that decrease binding, or increased activity (e.g., due expression intrinsic activity) protein. Nontarget-site (NTSR) endowed any mechanism not belonging TSR, e.g., reduction uptake translocation plant,...
Resistance to herbicides that inhibit protoporphyrinogen oxidase (PPO) is a widespread and growing problem for weed managers across the midwestern midsouthern United States. In Amaranthus spp., this resistance known be conferred by glycine deletion at 210th amino acid (ΔG210) in PPO2. Preliminary analysis indicated ΔG210 mutation did not fully account observed PPO inhibitors two palmeri populations from Tennessee one Arkansas.Sequencing PPX2 cDNA six resistant plants uncovered new mutations...