Article
Agronomy
Chandrima Shyam, Dallas E. Peterson, Mithila Jugulam
Summary: This study investigated the mechanism of resistance to the herbicide 2,4-D in a Palmer amaranth population collected from a conservation tillage field. The results showed that the resistance was primarily mediated by enhanced metabolism of 2,4-D.
Article
Multidisciplinary Sciences
Hossein Ghanizadeh, Fengshuo Li, Lulu He, Kerry C. Harrington
Summary: This study focused on a clopyralid-resistant population of S. sessilis collected from a golf course with a long history of clopyralid applications in New Zealand. The resistant phenotype was highly resistant to clopyralid and also exhibited cross-resistance to dicamba, MCPA and picloram. The resistant individuals had fewer lobes on their leaves, were slightly larger, had a larger leaf area, and greater root dry weight compared to susceptible plants.
Article
Forestry
Greta C. Gallina, Bert M. Cregg, Eric L. Patterson, Debalina Saha
Summary: Christmas trees are sensitive to weed competition, and weeds can cause growth issues and interfere with production processes. Chemical weed management strategies, with proper timing and application rates, are necessary for effective control. However, repeated use of herbicides with the same mechanism of action can lead to herbicide resistance in weeds, making it important to manage resistance.
Article
Agriculture, Multidisciplinary
Neanne Alnafta, Roland Beffa, Guido Bojack, Birgit Bollenbach-Wahl, Nicola Z. Brant, Christine Dornbrack, Nicole Dorn, Jorg Freigang, Elmar Gatzweiler, Rahel Getachew, Claudia Hartfiel, Ines Heinemann, Hendrik Helmke, Sabine Hohmann, Harald Jakobi, Gudrun Lange, Peter Lummen, Lothar Willms, Jens Frackenpohl
Summary: There are various challenges in controlling weeds, but the use of small molecular compounds remains the most efficient method. However, plants can develop resistance to active ingredients, including protoporphyrinogen oxidase (PPO) inhibitors which have been used for over 50 years as effective herbicides. Therefore, it is important to continuously discover and develop new PPO inhibitors with improved activity, resistance profile, crop safety, physicochemical properties, and toxicological profile. New lead structures with strong activity have been found through modifying known PPO inhibitors and modeling investigations.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Agronomy
Eric A. L. Jones, Micheal D. K. Owen
Summary: This study aimed to determine if selected Iowa waterhemp populations are less sensitive to VLCFA-inhibiting herbicides when additional herbicide resistance traits have evolved within the selected population. The results of the experiments provide evidence that some MHR waterhemp populations may exhibit decreased susceptibility to VLCFA-inhibiting herbicides, but generally, these herbicides remain efficacious on Iowa MHR waterhemp populations.
Article
Agronomy
Koffi Badou Jeremie Kouame, Matthew B. Bertucci, Mary C. Savin, Taghi Bararpour, Lawrence E. Steckel, Thomas R. Butts, Cammy D. Willett, Fellipe G. Machado, Nilda Roma-Burgos
Summary: Palmer amaranth is a problematic weed in the midsouthern United States, evolving resistance to various herbicides. In Arkansas, it has developed metabolic resistance to S-metolachlor, reducing the effectiveness of weed management. Greenhouse studies revealed resistant populations and evaluated their resistance levels.
Article
Biochemistry & Molecular Biology
Candelario Palma-Bautista, Pablo Belluccini, Jose G. Vazquez-Garcia, Ricardo Alcantara-de la Cruz, Francisco Barro, Joao Portugal, Rafael De Prado
Summary: The weed Carduus acanthoides L. has started invading GM crop production systems in Argentina, where glyphosate and 2,4-D are commonly used herbicides. In 2020, a population of C. acanthoides was found to have multiple resistance to both herbicides. The resistance mechanism for glyphosate was a Pro-106 mutation in the EPSPS gene, while resistance to 2,4-D was due to enhanced metabolism mediated by cytochrome P450. This is the first reported case of resistance to glyphosate and 2,4-D in C. acanthoides worldwide.
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Andrea Milani, Silvia Panozzo, Silvia Farinati, Duilio Iamonico, Maurizio Sattin, Donato Loddo, Laura Scarabel
Summary: Palmer amaranth is a noxious weed native to the Americas that causes high crop losses and rapidly evolves resistance to herbicides. Recent studies have shown that the main resistance mechanism of this weed is target-site related, although other resistance mechanisms cannot be ruled out. Some alternative herbicides are still effective against these populations.
Article
Agronomy
Maggie H. Wasacz, Lynn M. Sosnoskie, Mark J. vanGessel, Thierry E. Besancon
Summary: This study investigates the impact of dicamba off-target movement on sensitive crops, including cucumber, eggplant, and snap bean. It reveals that cucumber is not significantly affected, eggplant is moderately impacted with some yield reduction, and snap bean is highly sensitive with significant yield loss.
Article
Environmental Sciences
Gabriela Madureira Barroso, Mariana Generoso Ferreira, Edson Aparecido dos Santos, Evander Alves Ferreira, Miranda Titon, Pietra Vena Soares Xavier, Dayana Maria Teodoro Francino, Jose Barbosa dos Santos
Summary: Phytoremediation using plants such as Mabea fistulifera and Zeyheria tuberculosa is a recent and viable method for environmental decontamination, particularly in areas contaminated with herbicides like 2,4-D and picloram. These plants have shown tolerance to hormonal herbicides and can be used for recovery of natural areas close to cultivation areas where herbicides are used.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2022)
Article
Agronomy
Francesco Vidotto, Natalino Dalla Valle, Silvia Fogliatto, Marco Milan, Fernando De Palo, Maurizio Tabacchi, Aldo Ferrero
Summary: The study showed that repeated applications of the same herbicides on Echinochloa spp. populations with initial resistance can accelerate the development of herbicide resistance. Penoxsulam was less effective than cyhalofop-butyl, with the efficacy of herbicides declining over time. The findings suggest that herbicide rotation or mixing may not be effective in combating resistance if applied at too short intervals.
ARCHIVES OF AGRONOMY AND SOIL SCIENCE
(2021)
Article
Plant Sciences
Tiago Gazola, Renato Nunes Costa, Caio Antonio Carbonari, Edivaldo Domingues Velini
Summary: This study evaluated the dynamics of 2,4-D and dicamba in corn straw and their relationship with residual control of weeds. The leaching of the herbicides from the straw was influenced by rainfall amount and drought period, and the presence of the straw exerted a significant physical control effect on weeds. Furthermore, the efficacy of 2,4-D and dicamba varied in controlling different weed species in the absence of straw.
Article
Agriculture, Multidisciplinary
Vhuthu Ndou, Frederik H. Eksteen, Ethel E. Phiri, Petrus J. Pieterse
Summary: Resistance to glyphosate and paraquat has been confirmed in plantain populations, and further research is needed to understand the mechanisms of resistance and develop new control strategies.
NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH
(2023)
Article
Biochemistry & Molecular Biology
Fidel Gonzalez-Torralva, Jason K. Norsworthy
Summary: This research found that weedy rice (Oryza sativa L.) exhibits resistance to quizalofop-ethyl (quizalofop), mainly due to target-site mutations. The study also suggests the presence of herbicide metabolism mediated by glutathione-S-transferases (GSTs) as a non-target site resistance mechanism in some resistant weedy rice samples. These findings have significant implications for weedy rice management and weed control.
Article
Engineering, Environmental
Maura Gabriela da Silva Brochado, Kamila Cabral Mielke, Dilma Francisca de Paula, Ana Flavia Souza Laube, Ricardo Alcantara-de la Cruz, Mateus Pereira Gonzatto, Kassio Ferreira Mendes
Summary: The drift of auxinic herbicides 2,4-D and dicamba has different effects on crops, soil microbiota, and weeds. Dicamba is more toxic to mandarin seedlings, but both herbicides affect the physiological processes of plants.
JOURNAL OF HAZARDOUS MATERIALS ADVANCES
(2022)
Article
Agronomy
Brent P. Murphy, Roland Beffa, Patrick J. Tranel
Summary: The HPPD-inhibitor resistance in A. tuberculatus population NEB was found to be a dominant, complex trait with a high heritability. Two major QTLs were identified on Scaffold 4 and 12, controlling the resistance to HPPD inhibitors. This study represents the first QTL mapping of herbicide resistance in a weedy species.
PEST MANAGEMENT SCIENCE
(2021)
Article
Agronomy
David B. Westerveld, Nader Soltani, David C. Hooker, Darren E. Robinson, Patrick J. Tranel, Martin Laforest, Peter H. Sikkema
Summary: The study aimed to determine the biologically effective dose of metribuzin for preemergence and postemergence application to control MS and MR waterhemp populations. Results showed that waterhemp populations with NTSR (enhanced metabolism) can be controlled by metribuzin applied preemergence and postemergence, while those with TSR (glycine-264-serine altered target site) are not controlled by metribuzin.
Article
Biochemistry & Molecular Biology
Karl Ravet, Crystal D. Sparks, Andrea L. Dixon, Anita Kuepper, Eric P. Westra, Dean J. Pettinga, Patrick J. Tranel, Joel Felix, Don W. Morishita, Prashant Jha, Andrew Kniss, Phillip W. Stahlman, Paul Neve, Eric L. Patterson, Philip Westra, Todd A. Gaines
Summary: The study found evidence of at least two independent evolutionary origins of glyphosate resistance in kochia, followed by substantial and mostly geographically localized gene flow to spread the resistance alleles into diverse genetic backgrounds.
Article
Agronomy
Lucas K. Bobadilla, Darci A. Giacomini, Aaron G. Hager, Patrick J. Tranel
Summary: Waterhemp (Amaranthus tuberculatus) is a problematic agronomic weed in the midwestern United States. A resistant population, CHR, was identified and confirmed to have resistance to multiple herbicides, including dicamba. The resistance level in CHR was found to be 5-10 times higher compared to a sensitive parental line, and the inheritance of dicamba resistance was determined to be incomplete dominant with moderate heritability.
Article
Agronomy
Jose J. Nunes, Damilola A. Raiyemo, Nicholas J. Arneson, Alexandre T. Rosa, Patrick J. Tranel, Rodrigo Werle
Summary: Due to a lack of effective herbicide options, sweet corn producers often rely on nicosulfuron as the main post-emergence grass herbicide. However, this study found that fall panicum has developed resistance to nicosulfuron and identified the resistance mechanism. Additionally, the study discovered alternative herbicides that can effectively control the resistant fall panicum.
Article
Biology
Julia M. Kreiner, George Sandler, Aaron J. Stern, Patrick J. Tranel, Detlef Weigel, John R. Stinchcombe, Stephen Wright
Summary: This study investigates the evolutionary history of herbicide resistance in agricultural fields using genomic data from common waterhemp populations. The researchers find that resistance alleles show strong parallelism in their mutational origins and are influenced by gene flow in their distribution. The age and selection dynamics of resistant lineages vary, indicating heterogeneity in the forces that govern their persistence, including intra- and inter-locus allelic interactions.
Article
Agronomy
Julio A. Scursoni, Daniel Tuesca, Federico Balassone, Juan P. Morello, Daniela Medina Herrera, Maria C. Lescano, Nicolas Montero Bulacio, Roberto J. Crespo, Mara B. Depetris, Martin M. Vila-Aiub
Summary: This study evaluates the sensitivity of 50 smooth pigweed accessions to different herbicides. The results show that most accessions are susceptible to 2,4-D and dicamba, while showing high survival rates to glyphosate. Some accessions also show higher survival rates to fomesafen and topramezone, indicating genetic variability in smooth pigweed. Weed management practices should be prioritized to preserve the efficacy of these commonly used herbicides.
Article
Agronomy
Aimone Porri, Michael Betz, Kathryn Seebruck, Michael Knapp, Philipp Johnen, Matthias Witschel, Raphael Aponte, Rex Liebl, Patrick J. Tranel, Jens Lerchl
Summary: In this study, the efficacy of a new triazinone-type inhibitor, trifludimoxazin, in inhibiting PPO2 enzymes carrying target site mutations was assessed. The results strongly suggest that trifludimoxazin is a potent PPO-inhibiting herbicide. This study is of significant importance for the design of new herbicides to control resistant weeds.
PEST MANAGEMENT SCIENCE
(2023)
Article
Agronomy
Charles W. Cahoon, David L. Jordan, Patrick J. Tranel, Alan C. York, Chance Riggins, Richard Seagroves, Matthew Inman, Wesley Everman, Ramon Leon
Summary: Comparing the fitness of herbicide-resistant and herbicide-susceptible weed biotypes is crucial for managing herbicide resistance. Previous research has shown that there is little to no fitness penalty from amplification of the EPSPS gene (a mechanism of glyphosate resistance) in Palmer amaranth. However, in the absence of glyphosate, Palmer amaranth plants with EPSPS amplification are relatively less fit, but this reduced fitness does not result in differences in interference with cotton.
Article
Biology
Damilola A. Raiyemo, Lucas K. Bobadilla, Patrick J. Tranel
Summary: This study sequenced and analyzed the genomes of seven dioecious Amaranthus species, revealing their phylogenetic relationships and identifying genes involved in sex function. Coverage analysis identified candidate genes within the male-specific regions of A. palmeri and A. tuberculatus.
Review
Agronomy
Abigail L. Barker, John Pawlak, Stephen O. Duke, Roland Beffa, Patrick J. Tranel, Joe Wuerffel, Bryan Young, Aimone Porri, Rex Liebl, Raphael Aponte, Douglas Findley, Michael Betz, Jens Lerchl, Stanley Culpepper, Kevin Bradley, Franck E. Dayan
Summary: This article reviews the importance and current state of PPO-inhibiting herbicides, which have been used for 60 years since their first introduction. Recent increased interest in PPO-inhibiting herbicides, due to their increased use and cases of resistance, has led to a better understanding of the mechanism of action of PPO inhibitors. The article discusses the importance of the two isoforms of PPO in plants, current knowledge of target-site resistance mechanisms, non-target site resistance cases, and crop selectivity mechanisms. It emphasizes the need for consistent and reproducible greenhouse screening and target-site mutation assays to effectively study and compare PPO-inhibitor resistance cases.
Article
Plant Sciences
Lucas K. Bobadilla, Yousoon Baek, Patrick J. Tranel
Summary: This study identifies differential gene expression patterns between males and females in waterhemp and Palmer amaranth. It discovers potential key genes involved in sex determination and supports the hypothesis of two different evolutionary events for dioecy in the genus.
Review
Agronomy
Lucas K. Bobadilla, Patrick J. Tranel
Summary: The emergence of herbicide-resistant weeds is a significant threat to modern agriculture. This review discusses challenges of predicting herbicide cross resistance and highlights advancements in genomics and structural biology techniques that could be used to improve such prediction.
PEST MANAGEMENT SCIENCE
(2023)
Article
Ecology
Damilola A. A. Raiyemo, Patrick J. J. Tranel
Summary: This study investigated the phylogenetic relationships among dioecious amaranths and found incongruence in plastid gene tree. The results provide valuable resources and a framework for further evolutionary analyses of the Amaranthus genus.
BMC ECOLOGY AND EVOLUTION
(2023)
Article
Agronomy
Ana Saballos, Alvaro Soler-Garzon, Matthew Brooks, John Patrick Hart, Alexander Edward Lipka, Philip Miklas, Ronald Edward Peachey, Patrick J. Tranel, Martin M. Williams II
Summary: Effective weed management tools are crucial for maintaining profitable snap bean production against waterhemp. Few preemergence herbicides registered in snap bean have poor control of waterhemp. Sulfentrazone, a PPO-inhibiting herbicide, provides significant control of waterhemp, but crop tolerance to the herbicide is poorly known. A genome-wide association mapping study identified several genomic regions associated with snap bean tolerance to sulfentrazone, indicating a likely non-target site resistance. The study also found that seed size partially influences the tolerance, and several cytochrome P450 and ABC transporter genes were localized in associated genomic regions, providing insights into herbicide metabolism and potential improvements in snap bean.
FRONTIERS IN AGRONOMY
(2022)