Dean E. Riechers
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View article: Transcriptomic analysis reveals cloquintocet-mexyl-inducible genes in hexaploid wheat (Triticum aestivum L.)
Transcriptomic analysis reveals cloquintocet-mexyl-inducible genes in hexaploid wheat (Triticum aestivum L.) Open
Identification and characterization of genes encoding herbicide-detoxifying enzymes is lacking in allohexaploid wheat ( Triticum aestivum L.). Gene expression is frequently induced by herbicide safeners and implies the encoded enzymes serv…
View article: Herbicide resistance is complex: a global review of cross-resistance in weeds within herbicide groups
Herbicide resistance is complex: a global review of cross-resistance in weeds within herbicide groups Open
Herbicides have been placed in global Herbicide Resistance Action Committee (HRAC) herbicide groups based on their sites of action (e.g., acetolactate synthase–inhibiting herbicides are grouped in HRAC Group 2). A major driving force for t…
View article: Known and potential benefits of applying herbicides with glutathione <i>S</i>-transferase inhibitors and inducers—a review
Known and potential benefits of applying herbicides with glutathione <i>S</i>-transferase inhibitors and inducers—a review Open
Weed resistance to herbicides has increased exponentially during the past 30 to 40 yr, consequently reducing the number of effective products available to control certain species and populations. Future efforts should target not only the d…
View article: Metabolism of halauxifen acid is regulated by genes located on wheat chromosome 5A
Metabolism of halauxifen acid is regulated by genes located on wheat chromosome 5A Open
Allohexaploid wheat ( Triticum aestivum L.) is tolerant to halauxifen-methyl (HM) via rapid detoxification of the phytotoxic form of HM, halauxifen acid (HA), to non-phytotoxic metabolites. Previous research utilizing ‘Chinese Spring’ (CS)…
View article: Metabolism of the 4-Hydroxyphenylpyruvate Dioxygenase Inhibitor, Mesotrione, in Multiple-Herbicide-Resistant Palmer amaranth (<i>Amaranthus palmeri</i>)
Metabolism of the 4-Hydroxyphenylpyruvate Dioxygenase Inhibitor, Mesotrione, in Multiple-Herbicide-Resistant Palmer amaranth (<i>Amaranthus palmeri</i>) Open
Metabolic resistance to the maize-selective, HPPD-inhibiting herbicide, mesotrione, occurs via Phase I ring hydroxylation in resistant waterhemp and Palmer amaranth; however, mesotrione detoxification pathways post-Phase I are unknown. Thi…
View article: Quantifying resistance to very-long-chain fatty acid-inhibiting herbicides in Amaranthus tuberculatus using a soilless assay
Quantifying resistance to very-long-chain fatty acid-inhibiting herbicides in Amaranthus tuberculatus using a soilless assay Open
Resistance to preemergence (PRE) soil-applied herbicides, such as inhibitors of very-long-chain fatty acid (VLCFA) elongases, was documented in two waterhemp [ Amaranthus tuberculatus (Moq.) J.D. Sauer] populations (SIR and CHR) from Illin…
View article: Very long chain fatty acid–inhibiting herbicides: Current uses, site of action, herbicide-resistant weeds, and future
Very long chain fatty acid–inhibiting herbicides: Current uses, site of action, herbicide-resistant weeds, and future Open
The herbicides that inhibit very-long-chain fatty acid (VLCFA) elongases are primarily used for residual weed control in corn, barley, oat, sorghum, soybean, sugarcane, certain vegetable crops, and wheat production fields in the United Sta…
View article: Inheritance of resistance to <i>S</i>-metolachlor in a waterhemp (<i>Amaranthus tuberculatus</i>) population from central Illinois
Inheritance of resistance to <i>S</i>-metolachlor in a waterhemp (<i>Amaranthus tuberculatus</i>) population from central Illinois Open
Waterhemp [ Amaranthus tuberculatus (Moq.) Sauer] is a dioecious weed that has evolved resistance to very-long-chain fatty-acid elongase (VLCFAE)–inhibiting herbicides via rapid metabolism. Although detoxification enzyme activities are ass…
View article: Genetic architecture of soybean tolerance to off-target dicamba
Genetic architecture of soybean tolerance to off-target dicamba Open
The adoption of dicamba-tolerant (DT) soybean in the United States resulted in extensive off-target dicamba damage to non-DT vegetation across soybean-producing states. Although soybeans are highly sensitive to dicamba, the intensity of ob…
View article: Identification of genomic regions associated with soybean responses to off-target dicamba exposure
Identification of genomic regions associated with soybean responses to off-target dicamba exposure Open
The widespread adoption of genetically modified (GM) dicamba-tolerant (DT) soybean was followed by numerous reports of off-target dicamba damage and yield losses across most soybean-producing states. In this study, a subset of the USDA Soy…
View article: Control of waterhemp (<i>Amaranthus tuberculatus</i>) at multiple locations in Illinois with single preemergence applications of VLCFA-inhibiting herbicides
Control of waterhemp (<i>Amaranthus tuberculatus</i>) at multiple locations in Illinois with single preemergence applications of VLCFA-inhibiting herbicides Open
Herbicides that inhibit very-long-chain fatty acids (VLCFAs) have been widely used for preemergence control of annual monocot and small-seeded dicot weed species, such as waterhemp, since their discovery in the 1950s. VLCFA-inhibiting herb…
View article: Resistance to a nonselective 4‐hydroxyphenylpyruvate dioxygenase‐inhibiting herbicide via novel reduction–dehydration–glutathione conjugation in <i>Amaranthus tuberculatus</i>
Resistance to a nonselective 4‐hydroxyphenylpyruvate dioxygenase‐inhibiting herbicide via novel reduction–dehydration–glutathione conjugation in <i>Amaranthus tuberculatus</i> Open
Summary Metabolic resistance to 4‐hydroxyphenylpyruvate dioxygenase (HPPD)‐inhibiting herbicides is a threat in controlling waterhemp ( Amaranthus tuberculatus ) in the USA. We investigated resistance mechanisms to syncarpic acid‐3 (SA3), …
View article: Metabolic Pathways for<i>S</i>-Metolachlor Detoxification Differ Between Tolerant Corn and Multiple-Resistant Waterhemp
Metabolic Pathways for<i>S</i>-Metolachlor Detoxification Differ Between Tolerant Corn and Multiple-Resistant Waterhemp Open
Herbicide resistance in weeds can be conferred by target-site and/or non-target-site mechanisms, such as rapid metabolic detoxification. Resistance to the very-long-chain fatty acid–inhibiting herbicide, S-metolachlor, in multiple herbicid…
View article: Identification of chromosomes in Triticum aestivum possessing genes that confer tolerance to the synthetic auxin herbicide halauxifen-methyl
Identification of chromosomes in Triticum aestivum possessing genes that confer tolerance to the synthetic auxin herbicide halauxifen-methyl Open
Natural tolerance in hexaploid bread wheat ( Triticum aestivum L.) to synthetic auxin herbicides is primarily due to rapid metabolic detoxification, but genes encoding these herbicide-detoxifying enzymes have yet to be identified. Herbicid…
View article: Editorial: Plant Glutathione Transferases: Diverse, Multi-Tasking Enzymes With Yet-to-Be Discovered Functions
Editorial: Plant Glutathione Transferases: Diverse, Multi-Tasking Enzymes With Yet-to-Be Discovered Functions Open
International audience
View article: Carfentrazone-ethyl resistance in an Amaranthus tuberculatus population is not mediated by amino acid alterations in the PPO2 protein
Carfentrazone-ethyl resistance in an Amaranthus tuberculatus population is not mediated by amino acid alterations in the PPO2 protein Open
To date, the only known mechanism conferring protoporphyrinogen IX oxidase (PPO)-inhibitor resistance in waterhemp (Amaranthus tuberculatus) is a glycine deletion in PPO2 (ΔG210), which results in cross-resistance to foliar PPO-inhibiting …
View article: Transcriptome Profiling and Genome-Wide Association Studies Reveal GSTs and Other Defense Genes Involved in Multiple Signaling Pathways Induced by Herbicide Safener in Grain Sorghum
Transcriptome Profiling and Genome-Wide Association Studies Reveal GSTs and Other Defense Genes Involved in Multiple Signaling Pathways Induced by Herbicide Safener in Grain Sorghum Open
Herbicide safeners protect cereal crops from herbicide injury by inducing genes and proteins involved in detoxification reactions, such as glutathione S-transferases (GSTs) and cytochrome P450s (P450s). Only a few studies have characterize…
View article: Metabolic Pathway of Topramezone in Multiple-Resistant Waterhemp (Amaranthus tuberculatus) Differs From Naturally Tolerant Maize
Metabolic Pathway of Topramezone in Multiple-Resistant Waterhemp (Amaranthus tuberculatus) Differs From Naturally Tolerant Maize Open
Waterhemp [Amaranthus tuberculatus (Moq.) Sauer] is a problematic dicot weed in maize, soybean, and cotton production in the United States. Waterhemp has evolved resistance to several commercial herbicides that inhibit the 4-hydroxyphenylp…
View article: Biochemical characterization of metabolism‐based atrazine resistance in <i>Amaranthus tuberculatus</i> and identification of an expressed <i><scp>GST</scp></i> associated with resistance
Biochemical characterization of metabolism‐based atrazine resistance in <i>Amaranthus tuberculatus</i> and identification of an expressed <i><span>GST</span></i> associated with resistance Open
Summary Rapid detoxification of atrazine in naturally tolerant crops such as maize ( Zea mays ) and grain sorghum ( Sorghum bicolor ) results from glutathione S ‐transferase ( GST ) activity. In previous research, two atrazine‐resistant wa…
View article: Differential Responses to Preemergence and Postemergence Atrazine in Two Atrazine‐Resistant Waterhemp Populations
Differential Responses to Preemergence and Postemergence Atrazine in Two Atrazine‐Resistant Waterhemp Populations Open
Waterhemp [ Amaranthus tuberculatus (Moq) Sauer] is a difficult‐to‐control dicot weed in the United States. Atrazine [6‐chloro‐ N ‐ethyl‐ N ’‐(1‐methylethyl)‐1,3,5‐triazine‐2,4‐diamine] is commonly used for preemergence (PRE) and postemerg…
View article: 2,4-D Past, Present, and Future: A Review
2,4-D Past, Present, and Future: A Review Open
Since its discovery and initial commercialization in the 1940s, 2,4-D has been an important tool for weed control in a wide variety of crop and noncrop uses. Work studying its chemistry, physiology, mode of action, toxicology, environmenta…
View article: Responses of a Waterhemp (<i>Amaranthus tuberculatus</i>) Population Resistant to HPPD-Inhibiting Herbicides to Foliar-Applied Herbicides
Responses of a Waterhemp (<i>Amaranthus tuberculatus</i>) Population Resistant to HPPD-Inhibiting Herbicides to Foliar-Applied Herbicides Open
Field and greenhouse experiments were conducted to characterize the response of a waterhemp population from McLean County, IL to foliar-applied 4-hydroxyphenylpyruvate dioxygenase (HPPD) –inhibiting herbicides and determine the population'…
View article: Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay
Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay Open
In order to isolate and accurately determine rates of herbicide metabolism in an obligate-outcrossing dicot weed, waterhemp (Amaranthus tuberculatus), we developed an excised leaf assay combined with a vegetative cloning strategy to normal…
View article: Nontarget-Site Resistance to ALS Inhibitors in Waterhemp (<i>Amaranthus tuberculatus</i>)
Nontarget-Site Resistance to ALS Inhibitors in Waterhemp (<i>Amaranthus tuberculatus</i>) Open
A waterhemp population (MCR) previously characterized as resistant to 4-hydroxyphenylpyruvate dioxygenase and photosystem II inhibitors demonstrated both moderate and high levels of resistance to acetolactate synthase (ALS) inhibitors. Pla…