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Hoyos V, Plaza G, Palma-Bautista C, Vázquez-García JG, Dominguez-Valenzuela JA, Alcántara-de la Cruz R, De Prado R. Divergence in Glyphosate Susceptibility between Steinchisma laxum Populations Involves a Pro106Ser Mutation. PLANTS (BASEL, SWITZERLAND) 2023; 12:3315. [PMID: 37765479 PMCID: PMC10534422 DOI: 10.3390/plants12183315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/11/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
The characterization of the mechanisms conferring resistance to herbicides in weeds is essential for developing effective management programs. This study was focused on characterizing the resistance level and the main mechanisms that confer resistance to glyphosate in a resistant (R) Steinchisma laxum population collected in a Colombian rice field in 2020. The R population exhibited 11.2 times higher resistance compared to a susceptible (S) population. Non-target site resistance (NTSR) mechanisms that reduced absorption and impaired translocation and glyphosate metabolism were not involved in the resistance to glyphosate in the R population. Evaluating the target site resistance mechanisms by means of enzymatic activity assays and EPSPS (5-enolpyruvylshikimate-3-phosphate synthase) gene sequencing, the mutation Pro106Ser was found in R plants of S. laxum. These findings are crucial for managing the spread of S. laxum resistance in Colombia. To effectively control S. laxum in the future, it is imperative that farmers use herbicides with different mechanisms of action in addition to glyphosate and adopt Integrate Management Programs to control weeds in rice fields of the central valleys of Colombia.
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Affiliation(s)
- Veronica Hoyos
- Departamento de Ciencias Biológicas, Universidad Nacional de Colombia, Palmira 763533, Colombia
| | - Guido Plaza
- Departamento de Agronomía, Universidad Nacional de Colombia, Bogotá 111321, Colombia
| | - Candelario Palma-Bautista
- Departamento de Parasitología Agrícola, Universidad Autónoma Chapingo, Texcoco 56230, Mexico
- Agroforestry and Plant Biochemistry, Proteomics and Systems Biology, Department of Biochemistry and Molecular Biology, University of Cordoba, 14014 Cordoba, Spain
| | - Jose G. Vázquez-García
- Agroforestry and Plant Biochemistry, Proteomics and Systems Biology, Department of Biochemistry and Molecular Biology, University of Cordoba, 14014 Cordoba, Spain
| | | | | | - Rafael De Prado
- Agroforestry and Plant Biochemistry, Proteomics and Systems Biology, Department of Biochemistry and Molecular Biology, University of Cordoba, 14014 Cordoba, Spain
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Hwang JI, Norsworthy JK, Carvalho-Moore P, Barber LT, Butts TR, McElroy JS. Exploratory Analysis on Herbicide Metabolism and Very-Long-Chain Fatty Acid Production in Metolachlor-Resistant Palmer Amaranth ( Amaranthus palmeri S. Wats.). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023. [PMID: 37036857 DOI: 10.1021/acs.jafc.3c00196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
A Palmer amaranth (Amaranthus palmeri S. Wats.) biotype resistant to S-metolachlor was confirmed from crop fields in Arkansas, USA. This study investigated the metabolic effects of malathion (cytochrome P450 inhibitor) and 4-chloro-7-nitrobenzofurazan [NBD-Cl; glutathione S-transferase inhibitor] on the S-metolachlor-resistant A. palmeri biotype. Root elongation of the resistant biotype was 20% more inhibited by treatment of NBD-Cl (50 nM) and S-metolachlor (2 μM) in mixture than by treatment of S-metolachlor alone. Metabolites of S-metolachlor were 1.4-12.1 times greater produced in the resistant biotype for 7 d than in the susceptible standard. Production of cerotic acid, one of the very-long-chain fatty acids containing 26 carbons, was more reduced in the susceptible standard (3.8-fold) than in the resistant biotype (1.8-fold) by S-metolachlor treatment. Conclusively, evolution of S-metolachlor resistance observed in this study was likely associated with improved activity of glutathione S-transferases. Further studies are needed to genetically evaluate plant endogenous enzymes involving cerotic acid production.
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Affiliation(s)
- Jeong-In Hwang
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Jason K Norsworthy
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Pamela Carvalho-Moore
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - L Tom Barber
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Thomas R Butts
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - J Scott McElroy
- Department of Crop, Soil and Environmental Sciences, Auburn University, Auburn, Alabama 36831, United States
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Kouame KB, Butts TR, Werle R, Johnson WG. Impact of volatility reduction agents on dicamba and glyphosate spray solution pH, droplet dynamics, and weed control. PEST MANAGEMENT SCIENCE 2023; 79:857-869. [PMID: 36305819 PMCID: PMC10100389 DOI: 10.1002/ps.7258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 09/29/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Regulations in 2021 required the addition of a volatility reduction agent (VRA) to dicamba spray mixtures for postemergence weed control. Understanding the impact of VRAs on weed control, droplet dynamics, and spray pH is essential. RESULTS Adding glyphosate to dicamba decreased the solution pH by 0.63 to 1.85 units. Across locations, potassium carbonate increased the tank-mixture pH by 0.85 to 1.65 units while potassium acetate raised the pH by 0.46 to 0.53 units. Glyphosate and dicamba in tank-mixture reduced Palmer amaranth control by 14 percentage points compared to dicamba alone and decreased barnyardgrass control by 12 percentage points compared to glyphosate alone 4 weeks after application (WAA). VRAs resulted in a 5-percentage point reduction in barnyardgrass control 4 WAA. Common ragweed, common lambsquarters, and giant ragweed control were unaffected by herbicide solution 4 WAA. Dicamba alone produced a larger average droplet size and had the fewest driftable fines (% volume < 200 μm). Potassium acetate produced a larger droplet size than potassium carbonate for Dv0.1 and Dv0.5 . The addition of glyphosate to dicamba decreased droplet size from the entire spray droplet spectrum (Dv0.1 , Dv0.5 , Dv0.9 ). CONCLUSION A reduction in spray pH, droplet size, and weed control was observed from mixing dicamba and glyphosate. It may be advisable to avoid tank-mixtures of these herbicides and instead, apply them sequentially to maximize effectiveness. VRAs differed in their impacts on spray solution pH and droplet dynamics, but resulted in a minimal negative to no impact on weed control. © 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Koffi Badou‐Jeremie Kouame
- Postdoctoral Research Fellow, Department of Crop, Soil, and Environmental SciencesUniversity of Arkansas System Division of AgricultureLonokeARUSA
| | - Thomas R. Butts
- Extension Weed Scientist, Department of Crop, Soil, and Environmental SciencesUniversity of Arkansas System Division of AgricultureLonokeARUSA
| | - Rodrigo Werle
- Extension Weed Scientist, Department of AgronomyUniversity of Wisconsin‐MadisonMadisonWIUSA
| | - William G. Johnson
- Weed Scientist, Department of Botany & Plant PathologyPurdue UniversityWest LafayetteINUSA
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Zhang X, Zhao J, Wang M, Li Z, Lin S, Chen H. Potential distribution prediction of Amaranthus palmeri S. Watson in China under current and future climate scenarios. Ecol Evol 2022; 12:e9505. [PMCID: PMC9743064 DOI: 10.1002/ece3.9505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 10/10/2022] [Accepted: 10/25/2022] [Indexed: 12/14/2022] Open
Abstract
The vicious invasive alien plant Amaranthus palmeri poses a serious threat to ecological security and food security due to its strong adaptability, competitiveness, and herbicide resistance. Predicting its potential habitats under current and future climate change is critical for monitoring and early warning. In this study, we used two sets of climate data, namely, WorldClim1.4 and RCPs (the historical climate data of WorldClim version 1.4 and future climate data of RCPs), WorldClim2.1 and SSPs (the historical climate data of WorldClim version 2.1 and future climate data of SSPs), to analyze the dominant environmental variables affecting the habitat suitability and predict the potential distribution of A. palmeri to climate change in China based on the MaxEnt model. The results show that (i) Temperature has a greater impact on the distribution of A. palmeri. The relative contributions of temperature‐related variables count to 70% or more, and the annual mean temperature (bio1) reached more than 40%. (ii) At present, the potentially suitable area is widely distributed in the central‐east and parts of southwest China, and the high suitable area is focused on the North China Plain. The potential suitable area predicted by WorldClim1.4 and WorldClim2.1 both accounts for about 31% of China's total land area. (iii) Future climate change will expand the suitable habitats to high latitudes and altitudes. The overall suitable area maximum increased to 44.93% under SSPs and 38.91% under RCPs. We conclude that climate change would increase the risk of A. palmeri expanding to high latitudes and altitudes, the results have practical implications for the effective long‐term management in response to the global warming of A. palmeri.
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Affiliation(s)
- Xinyi Zhang
- Institute of Digital AgricultureFujian Academy of Agricultural SciencesFuzhouChina,State Key Laboratory for Ecological Pest Control of Fujian and Taiwan CropsInstitute of Applied Ecology, Fujian Agriculture and Forestry UniversityFuzhouChina
| | - Jian Zhao
- Institute of Digital AgricultureFujian Academy of Agricultural SciencesFuzhouChina
| | - Miaomiao Wang
- Institute of Digital AgricultureFujian Academy of Agricultural SciencesFuzhouChina
| | - Zhipeng Li
- Institute of Digital AgricultureFujian Academy of Agricultural SciencesFuzhouChina
| | - Sheng Lin
- State Key Laboratory for Ecological Pest Control of Fujian and Taiwan CropsInstitute of Applied Ecology, Fujian Agriculture and Forestry UniversityFuzhouChina
| | - Hong Chen
- Institute of Digital AgricultureFujian Academy of Agricultural SciencesFuzhouChina
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Farr R, Norsworthy JK, Barber LT, Butts TR, Roberts T. Utility of roller wiper applications of dicamba for Palmer amaranth control in soybean. PEST MANAGEMENT SCIENCE 2022; 78:2151-2160. [PMID: 35170207 PMCID: PMC9314051 DOI: 10.1002/ps.6838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 02/09/2022] [Accepted: 02/16/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND The commercialization of dicamba-resistant soybean has resulted in increased concern for off-target movement of dicamba onto sensitive vegetation. To mitigate the off-target movement through physical drift, one might consider use of rope wicks and other wiper applicators. Although wiper-type application methods have been efficacious in pasture settings, the utility of dicamba using wiper applicators in agronomic crops is not available in scientific literature. To determine the utility of roller wipers for dicamba applications in dicamba-resistant soybean, two separate experiments were conducted in the summer of 2020 and replicated in both Keiser and Fayetteville, AR, USA. RESULTS Utilizing opposing application directions and a 2:1:1 ratio of water: formulated glyphosate: formulated dicamba were the most efficacious practices for controlling Palmer amaranth. The high herbicide concentrations and wiping in opposing directions increased dicamba-resistant soybean injury when the wiper contacted the crop, but no yield loss was observed because of this injury. Broadcast applications resulted in greater Palmer amaranth mortality than roller wiper applications, and the most effective roller wiper treatments were when two sequential applications were made inside the crop canopy. CONCLUSIONS Dicamba applications require adequate coverage for optimum weed control. While efforts can be made to increase roller wiper efficacy by optimizing coverage and timing of applications, broadcast applications are superior to roller wiper applicators for weed control. Roller wiper applications did not reduce soybean yield, thus wiper-type applications may be safely used in dicamba-resistant soybean, albeit the likelihood for off-target damage caused by volatilization of these treatments would need to be investigated. © 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Rodger Farr
- Department of Crop, Soil, and Environmental SciencesUniversity of ArkansasFayettevilleARUSA
| | - Jason K. Norsworthy
- Department of Crop, Soil, and Environmental SciencesUniversity of ArkansasFayettevilleARUSA
| | - L. Tom Barber
- Department of Crop, Soil, and Environmental SciencesUniversity of Arkansas Systems Division of AgricultureLonokeARUSA
| | - Thomas R. Butts
- Department of Crop, Soil, and Environmental SciencesUniversity of Arkansas Systems Division of AgricultureLonokeARUSA
| | - Trent Roberts
- Department of Crop, Soil, and Environmental SciencesUniversity of ArkansasFayettevilleARUSA
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Takano HK, Dayan FE. Glufosinate-ammonium: a review of the current state of knowledge. PEST MANAGEMENT SCIENCE 2020; 76:3911-3925. [PMID: 32578317 DOI: 10.1002/ps.5965] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 06/16/2020] [Accepted: 06/23/2020] [Indexed: 05/11/2023]
Abstract
Glufosinate is a key herbicide to manage glyphosate-resistant weeds mainly because it is a broad-spectrum herbicide, and transgenic glufosinate-resistant crops are available. Although glufosinate use has increased exponentially over the past decade, the treated area with this herbicide is far less than that with glyphosate. This is because glufosinate often provides inconsistent performance in the field, which is attributed to several factors including environmental conditions, application technology, and weed species. Glufosinate is also highly hydrophilic and does not translocate well in plants, generally providing poor control of grasses and perennial species. In the soil, glufosinate is rapidly degraded by microorganisms, leaving no residual activity. While there have been concerns regarding glufosinate toxicology, its proper use can be considered safe. Glufosinate is a fast-acting herbicide that was first discovered as a natural product, and is the only herbicide presently targeting glutamine synthetase. The mode of action of glufosinate has been controversial, and the causes for the rapid phytotoxicity have often been attributed to ammonia accumulation. Recent studies indicate that the contact activity of glufosinate results from the accumulation of reactive oxygen species and subsequent lipid peroxidation. Glufosinate disrupts both photorespiration and the light reactions of photosynthesis, leading to photoreduction of molecular oxygen, which generates reactive oxygen species. The new understanding of the mode of action provided new ideas to improve the herbicidal activity of glufosinate. Finally, a very few weed species have evolved glufosinate resistance in the field, and the resistance mechanisms are generally not well understood requiring further investigation. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Hudson K Takano
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, USA
| | - Franck E Dayan
- Department of Agricultural Biology, Colorado State University, Fort Collins, CO, USA
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Han H, Picoli Jr. GJ, Guo H, Yu Q, Powles SB. Mechanistic basis for synergism of 2,4-D amine and metribuzin in Avena sterilis. JOURNAL OF PESTICIDE SCIENCE 2020; 45:216-222. [PMID: 33304190 PMCID: PMC7691562 DOI: 10.1584/jpestics.d20-028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The combination of herbicides with different modes of action has been adopted not only to improve weed control but also to increase the environmental sustainability of plant-protection products. In this study, we showed a synergistic effect of the auxin herbicide 2,4-D amine with the PSII-inhibiting herbicide metribuzin to control the global grass weed wild oat (Avena sterilis) population and investigated the underlying mechanisms. Pretreatment with 2,4-D amine did not change the foliar absorption of metribuzin but did increase metribuzin translocation to the roots and new leaves, although enhancement of the metribuzin metabolism was also observed. Considering that the expression level of the target site psbA gene is significantly higher in leaves than in roots, increased metribuzin translocation to new leaves is likely the major cause of the observed synergism, even though enhanced metribuzin metabolism may offset the metribuzin efficacy. This is the first report on the synergistic mechanism between 2,4-D amine and metribuzin in weed control.
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Affiliation(s)
- Heping Han
- Australian Herbicide Resistance Initiative, School of Agriculture & Environment, University of Western Australia
| | | | - Haibin Guo
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bio-Resources, South China Agricultural University
| | - Qin Yu
- Australian Herbicide Resistance Initiative, School of Agriculture & Environment, University of Western Australia
- To whom correspondence should be addressed. E-mail:
| | - Stephen Bruce Powles
- Australian Herbicide Resistance Initiative, School of Agriculture & Environment, University of Western Australia
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