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Fernández-Aparicio M, Delavault P, Timko MP. Management of Infection by Parasitic Weeds: A Review. PLANTS (BASEL, SWITZERLAND) 2020; 9:E1184. [PMID: 32932904 PMCID: PMC7570238 DOI: 10.3390/plants9091184] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 09/03/2020] [Accepted: 09/09/2020] [Indexed: 12/30/2022]
Abstract
Parasitic plants rely on neighboring host plants to complete their life cycle, forming vascular connections through which they withdraw needed nutritive resources. In natural ecosystems, parasitic plants form one component of the plant community and parasitism contributes to overall community balance. In contrast, when parasitic plants become established in low biodiversified agroecosystems, their persistence causes tremendous yield losses rendering agricultural lands uncultivable. The control of parasitic weeds is challenging because there are few sources of crop resistance and it is difficult to apply controlling methods selective enough to kill the weeds without damaging the crop to which they are physically and biochemically attached. The management of parasitic weeds is also hindered by their high fecundity, dispersal efficiency, persistent seedbank, and rapid responses to changes in agricultural practices, which allow them to adapt to new hosts and manifest increased aggressiveness against new resistant cultivars. New understanding of the physiological and molecular mechanisms behind the processes of germination and haustorium development, and behind the crop resistant response, in addition to the discovery of new targets for herbicides and bioherbicides will guide researchers on the design of modern agricultural strategies for more effective, durable, and health compatible parasitic weed control.
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Affiliation(s)
- Mónica Fernández-Aparicio
- Institute for Sustainable Agriculture, Consejo Superior de Investigaciones Científicas (CSIC), 14004 Córdoba, Spain
| | - Philippe Delavault
- Laboratory of Plant Biology and Pathology, University of Nantes, 44035 Nantes, France;
| | - Michael P. Timko
- Department of Biology University of Virginia, Charlottesville, VA 22904-4328, USA;
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2
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Duke SO, Stidham MA, Dayan FE. A novel genomic approach to herbicide and herbicide mode of action discovery. PEST MANAGEMENT SCIENCE 2019; 75:314-317. [PMID: 30280497 DOI: 10.1002/ps.5228] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 09/12/2018] [Accepted: 09/26/2018] [Indexed: 05/26/2023]
Abstract
A herbicide with a new mode of action has not been commercialized for more than 30 years. A recent paper describes a novel genomic approach to herbicide and herbicide mode of action discovery. Analysis of a microbial gene cluster revealed that it encodes genes for both the biosynthetic pathway for production of the sesquiterpene aspterric acid and an aspterric acid-resistant form of dihydroxy acid dehydratase (DHAD), its target enzyme. Aspterric acid is weak compared with commercial synthetic herbicides, and whether DHAD is a good herbicide target is unclear from this study. Nevertheless, this genomic approach provides a novel strategy for the discovery of herbicides with new modes action. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Stephen O Duke
- United States Department of Agriculture, Agricultural Research Service, Natural Products Utilization Research Unit, University, MI, USA
| | | | - Franck E Dayan
- Department of Bioagricultural Sciences and Pest Management, Colorado State University, Ft Collins, CO, USA
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3
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Carles L, Rossi F, Besse-Hoggan P, Blavignac C, Leremboure M, Artigas J, Batisson I. Nicosulfuron Degradation by an Ascomycete Fungus Isolated From Submerged Alnus Leaf Litter. Front Microbiol 2018; 9:3167. [PMID: 30619225 PMCID: PMC6305708 DOI: 10.3389/fmicb.2018.03167] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 12/07/2018] [Indexed: 11/14/2022] Open
Abstract
Nicosulfuron is a selective herbicide belonging to the sulfonylurea family, commonly applied on maize crops. Its worldwide use results in widespread presence as a contaminant in surface streams and ground-waters. In this study, we isolated, for the first time, the Plectosphaerella cucumerina AR1 nicosulfuron-degrading fungal strain, a new record from Alnus leaf litter submerged in freshwater. The degradation of nicosulfuron by P. cucumerina AR1 was achieved by a co-metabolism process and followed a first-order model dissipation. Biodegradation kinetics analysis indicated that, in planktonic lifestyle, nicosulfuron degradation by this strain was glucose concentration dependent, with a maximum specific degradation rate of 1 g/L in glucose. When grown on natural substrata (leaf or wood) as the sole carbon sources, the Plectosphaerella cucumerina AR1 developed as a well-established biofilm in 10 days. After addition of nicosulfuron in the medium, the biofilms became thicker, with rising mycelium, after 10 days for leaves and 21 days for wood. Similar biofilm development was observed in the absence of herbicide. These fungal biofilms still conserve the nicosulfuron degradation capacity, using the same pathway as that observed with planktonic lifestyle as evidenced by LC-MS analyses. This pathway involved first the hydrolysis of the nicosulfuron sulfonylurea bridge, leading to the production of two major metabolites: 2-amino-4,6-dimethoxypyrimidine (ADMP) and 2-(aminosulfonyl)-N,N-dimethyl-3-pyridinecarboxamide (ASDM). One minor metabolite, identified as 2-(1-(4,6-dimethoxy-pyrimidin-2-yl)-ureido)-N,N-dimethyl-nicotinamide (N3), derived from the cleavage of the C-S bond of the sulfonylurea bridge and contraction by elimination of sulfur dioxide. A last metabolite (N4), detected in trace amount, was assigned to 2-(4,6-dimethoxy-pyrimidin-2-yl)-N,N-dimethyl-nicotinamide (N4), resulting from the hydrolysis of the N3 urea function. Although fungal growth was unaffected by nicosulfuron, its laccase activity was significantly impaired regardless of lifestyle. Leaf and wood surfaces being good substrata for biofilm development in rivers, P. cucumerina AR1 strain could thus have potential as an efficient candidate for the development of methods aiming to reduce contamination by nicosulfuron in aquatic environments.
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Affiliation(s)
- Louis Carles
- Laboratoire Microorganismes: Génome et Environnement, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Florent Rossi
- Laboratoire Microorganismes: Génome et Environnement, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Pascale Besse-Hoggan
- Institut de Chimie de Clermont-Ferrand, CNRS, Sigma Clermont, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Christelle Blavignac
- Centre Imagerie Cellulaire Santé, Université Clermont Auvergne (UCA PARTNER), Clermont-Ferrand, France
| | - Martin Leremboure
- Institut de Chimie de Clermont-Ferrand, CNRS, Sigma Clermont, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Joan Artigas
- Laboratoire Microorganismes: Génome et Environnement, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Isabelle Batisson
- Laboratoire Microorganismes: Génome et Environnement, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
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4
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Carles L, Joly M, Bonnemoy F, Leremboure M, Donnadieu F, Batisson I, Besse-Hoggan P. Biodegradation and toxicity of a maize herbicide mixture: mesotrione, nicosulfuron and S-metolachlor. JOURNAL OF HAZARDOUS MATERIALS 2018; 354:42-53. [PMID: 29727789 DOI: 10.1016/j.jhazmat.2018.04.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2017] [Revised: 04/18/2018] [Accepted: 04/19/2018] [Indexed: 06/08/2023]
Abstract
The prediction of chemical mixture toxicity is a major concern regarding unintentional mixture of pesticides from agricultural lands treated with various such compounds. We focused our work on a mixture of three herbicides commonly applied on maize crops within a fortnight, namely mesotrione (β-triketone), nicosulfuron (sulfonylurea) and S-metolachlor (chloroacetanilide). The metabolic pathways of mesotrione and nicosulfuron were qualitatively and quantitatively determined with a bacterial strain (Bacillus megaterium Mes11). This strain was isolated from an agricultural soil and able to biotransform both these herbicides. Although these pathways were unaffected in the case of binary or ternary herbicide mixtures, kinetics of nicosulfuron disappearance and also of mesotrione and nicosulfuron metabolite formation was strongly modulated. The toxicity of the parent compounds and metabolites was evaluated for individual compounds and mixtures with the standardized Microtox® test. Synergistic interactions were evidenced for all the parent compound mixtures. Synergistic, antagonistic or additive toxicity was obtained depending on the metabolite mixture. Overall, these results emphasize the need to take into account the active ingredient and metabolites all together for the determination of environmental fate and toxicity of pesticide mixtures.
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Affiliation(s)
- Louis Carles
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, CNRS, Sigma Clermont, Institut de Chimie de Clermont-Ferrand (ICCF), F-63000, Clermont-Ferrand, France.
| | - Muriel Joly
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, CNRS, Sigma Clermont, Institut de Chimie de Clermont-Ferrand (ICCF), F-63000, Clermont-Ferrand, France
| | - Frédérique Bonnemoy
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France
| | - Martin Leremboure
- Université Clermont Auvergne, CNRS, Sigma Clermont, Institut de Chimie de Clermont-Ferrand (ICCF), F-63000, Clermont-Ferrand, France
| | - Florence Donnadieu
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France
| | - Isabelle Batisson
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes : Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France
| | - Pascale Besse-Hoggan
- Université Clermont Auvergne, CNRS, Sigma Clermont, Institut de Chimie de Clermont-Ferrand (ICCF), F-63000, Clermont-Ferrand, France
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5
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Jimenez F, Rojano-Delgado AM, Fernández PT, Rodríguez-Suárez C, Atienza SG, De Prado R. Physiological, biochemical and molecular characterization of an induced mutation conferring imidazolinone resistance in wheat. PHYSIOLOGIA PLANTARUM 2016; 158:2-10. [PMID: 26991509 DOI: 10.1111/ppl.12445] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 12/19/2015] [Accepted: 02/14/2016] [Indexed: 06/05/2023]
Abstract
The Clearfield(®) wheat cultivars possessing imidazolinone (IMI)-resistant traits provide an efficient option for controlling weeds. The imazamox-resistant cultivar Pantera (Clearfield(®) ) was compared with a susceptible cultivar (Gazul). Target and non-target mechanisms of resistance were studied to characterize the resistance of Pantera and to identify the importance of each mechanism involved in this resistance. Pantera is resistant to imazamox as was determined in previous experiments. The molecular study confirmed that it carries a mutation Ser-Asn627 conferring resistance to imazamox in two out of three acetolactate synthase (ALS) genes (imi1 and imi2), located in wheat on chromosomes 6B and 6D, respectively. However, the last gene (imi3) located on chromosome 6A does not carry any mutation conferring resistance. As a result, photosynthetic activity and chlorophyll content were reduced after imazamox treatment. Detoxification was higher in the resistant biotype as shown by metabolomic study while imazamox translocation was higher in the susceptible cultivar. Interestingly, imazamox metabolism was higher at higher doses of herbicide, which suggests that the detoxification process is an inducible mechanism in which the upregulation of key gene coding for detoxification enzymes could play an important role. Thus, the identification of cultivars with a higher detoxification potential would allow the development of more resistant varieties.
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Affiliation(s)
- Francisco Jimenez
- Dominican Research Institute for Agriculture and Forestry (IDIAF) Rafael Augusto Sánchez, Santo Domingo, 10147, Dominican Republic
| | - Antonia M Rojano-Delgado
- Department of Agricultural Chemistry, Campus of Rabanales, and Agroalimentary Excellence Campus, ceiA3, University of Córdoba, Córdoba, Spain
| | - Pablo Tomas Fernández
- Department of Agricultural Chemistry, Campus of Rabanales, and Agroalimentary Excellence Campus, ceiA3, University of Córdoba, Córdoba, Spain
| | | | | | - Rafael De Prado
- Department of Agricultural Chemistry, Campus of Rabanales, and Agroalimentary Excellence Campus, ceiA3, University of Córdoba, Córdoba, Spain
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6
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Bi Y, Liu W, Guo W, Li L, Yuan G, Du L, Wang J. Molecular basis of multiple resistance to ACCase- and ALS-inhibiting herbicides in Alopecurus japonicus from China. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2016; 126:22-27. [PMID: 26778430 DOI: 10.1016/j.pestbp.2015.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 06/12/2015] [Accepted: 07/10/2015] [Indexed: 06/05/2023]
Abstract
Fenoxaprop-P-ethyl-resistant Alopecurus japonicus has become a recurring problem in winter wheat fields in eastern China. Growers have resorted to using mesosulfuron-methyl, an acetolactate synthase (ALS)-inhibiting herbicide, to control this weed. A single A. japonicus population (AH-15) resistant to fenoxaprop-P-ethyl and mesosulfuron-methyl was found in Anhui Province, China. The results of whole-plant dose-response experiments showed that AH-15 has evolved high-level resistance to fenoxaprop-P-ethyl (95.96-fold) and mesosulfuron-methyl (39.87-fold). It was shown via molecular analysis that resistance to both fenoxaprop-P-ethyl and mesosulfuron-methyl was due to an amino acid substitution of Ile1781 to Leu in acetyl-CoA carboxylase (ACCase) and a substitution of Trp 574 to Leu in ALS, respectively. Whole-plant bioassays indicated that the AH-15 population was resistant to the ACCase herbicides clodinafop-propargyl, clethodim, sethoxydim and pinoxaden as well as the ALS herbicides pyroxsulam, flucarbazone-Na and imazethapyr, but susceptible to the ACCase herbicide haloxyfop-R-methyl. This work reports for the first time that A. japonicus has developed resistance to ACCase- and ALS-inhibiting herbicides due to target site mutations in the ACCase and ALS genes.
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Affiliation(s)
- Yaling Bi
- College of Agronomy, Anhui Science and Technology University, Anhui, Fengyang 233100, PR China; Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Shandong, Tai'an 271018, PR China
| | - Weitang Liu
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Shandong, Tai'an 271018, PR China
| | - Wenlei Guo
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Shandong, Tai'an 271018, PR China
| | - Lingxu Li
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Shandong, Tai'an 271018, PR China; College of Chemistry and Pharmaceutical Science, Qingdao Agricultural University, Shandong, Qingdao 266109, PR China
| | - Guohui Yuan
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Shandong, Tai'an 271018, PR China
| | - Long Du
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Shandong, Tai'an 271018, PR China
| | - Jinxin Wang
- Key Laboratory of Pesticide Toxicology and Application Technique, College of Plant Protection, Shandong Agricultural University, Shandong, Tai'an 271018, PR China.
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7
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Chen CN, Chen Q, Liu YC, Zhu XL, Niu CW, Xi Z, Yang GF. Syntheses and herbicidal activity of new triazolopyrimidine-2-sulfonamides as acetohydroxyacid synthase inhibitor. Bioorg Med Chem 2010; 18:4897-904. [DOI: 10.1016/j.bmc.2010.06.015] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 06/03/2010] [Accepted: 06/04/2010] [Indexed: 11/26/2022]
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8
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Roy K, Paul S. Docking and 3D-QSAR studies of acetohydroxy acid synthase inhibitor sulfonylurea derivatives. J Mol Model 2009; 16:951-64. [PMID: 19841951 DOI: 10.1007/s00894-009-0596-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2009] [Accepted: 09/14/2009] [Indexed: 10/20/2022]
Abstract
Docking and three dimensional quantitative-structure activity relationship (3D-QSAR) studies were performed on acetohydroxy acid synthase (AHAS) inhibitor sulfonylurea analogues with potential herbicidal activity. The 3D-QSAR studies were carried out using shape, spatial and electronic descriptors along with a few structural parameters. Genetic function approximation (GFA) was used as the chemometric tool for this analysis. The whole data set (n = 45) was divided into a training set (75% of the data set) and a test set (remaining 25%) on the basis of the K-means clustering technique on a standardised topological, physicochemical and structural descriptor matrix. Models developed from the training set were used to predict the activity of the test set compounds. All models were validated internally, externally and using the Y-randomisation technique. Docking studies suggested that the molecules bind within a pocket of the enzyme formed by some important amino acid residues (Met351, Asp375, Arg377, Gly509, Met570 and Val571). In QSAR studies, molecular shape analysis showed that bulky substitution at the R(1) position may enhance AHAS inhibitory activity. Charged surface area descriptors suggested that negative charge distributed over a large surface area may enhance this activity. The hydrogen bond acceptor parameter supported the charged surface area descriptors and suggested that, for better activity, the number of electronegative atoms present in the molecule should be high. The spatial descriptors show that, for better activity, the molecules should possess a bulky substituent and a small substitution at the R(2) and R(3) positions, respectively.
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Affiliation(s)
- Kunal Roy
- Drug Theoretics and Cheminformatics Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India.
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9
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Design and synthesis of N-2,6-difluorophenyl-5-methoxyl-1,2,4-triazolo[1,5-a]-pyrimidine-2-sulfonamide as acetohydroxyacid synthase inhibitor. Bioorg Med Chem 2009; 17:3011-7. [DOI: 10.1016/j.bmc.2009.03.018] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2009] [Revised: 03/09/2009] [Accepted: 03/10/2009] [Indexed: 11/21/2022]
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10
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Studies on synthesis and molecular dynamics simulation of dendrimers containing amino acids and peptides. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/s11458-007-0071-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Nelson DR, Duxbury T. The distribution of acetohydroxyacid synthase in soil bacteria. Antonie Van Leeuwenhoek 2007; 93:123-32. [PMID: 17624809 DOI: 10.1007/s10482-007-9186-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2007] [Accepted: 06/18/2007] [Indexed: 11/26/2022]
Abstract
Most bacteria possess the enzyme acetohydroxyacid synthase, which is used to produce branched-chain amino acids. Enteric bacteria contain several isozymes suited to different conditions, but the distribution of acetohydroxyacid synthase in soil bacteria is largely unknown. Growth experiments confirmed that Escherichia coli, Salmonella enterica serotype Typhimurium, and Enterobacter aerogenes contain isozymes of acetohydroxyacid synthase, allowing the bacteria to grow in the presence of valine (which causes feedback inhibition of AHAS I) or the sulfonylurea herbicide triasulfuron (which inhibits AHAS II) although a slight lag phase was observed in growth in the latter case. Several common soil isolates were inhibited by triasulfuron, but Pseudomonas fluorescens and Rhodococcus erythropolis were not inhibited by any combination of triasulfuron and valine. The extent of sulfonylurea-sensitive acetohydroxyacid synthase in soil was revealed when 21 out of 27 isolated bacteria in pure culture were inhibited by triasulfuron, the addition of isoleucine and/or valine reversing the effect in 19 cases. Primers were designed to target the genes encoding the large subunits (ilvB, ilvG and ilvI) of acetohydroxyacid synthase from available sequence data and a approximately 355 bp fragment in Bacillus subtilis, Arthrobacter globiformis, E. coli and S. enterica was subsequently amplified. The primers were used to create a small clone library of sequences from an agricultural soil. Phylogenetic analysis revealed significant sequence variation, but all 19 amino acid sequences were most closely related to published large subunit acetohydroxyacid synthase amino acid sequences within several phyla including the Proteobacteria and Actinobacteria. The results suggested the majority of soil microorganisms contain only one functional acetohydroxyacid synthase enzyme sensitive to sulfonylurea herbicides.
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Affiliation(s)
- Darryl R Nelson
- School of Molecular and Microbial Biosciences, University of Sydney, Sydney, NSW, 2006, Australia.
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12
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McCourt JA, Duggleby RG. Acetohydroxyacid synthase and its role in the biosynthetic pathway for branched-chain amino acids. Amino Acids 2006; 31:173-210. [PMID: 16699828 DOI: 10.1007/s00726-005-0297-3] [Citation(s) in RCA: 171] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Accepted: 12/09/2005] [Indexed: 11/25/2022]
Abstract
The branched-chain amino acids are synthesized by plants, fungi and microorganisms, but not by animals. Therefore, the enzymes of this pathway are potential target sites for the development of antifungal agents, antimicrobials and herbicides. Most research has focused upon the first enzyme in this biosynthetic pathway, acetohydroxyacid synthase (AHAS) largely because it is the target site for many commercial herbicides. In this review we provide a brief overview of the important properties of each enzyme within the pathway and a detailed summary of the most recent AHAS research, against the perspective of work that has been carried out over the past 50 years.
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Affiliation(s)
- J A McCourt
- School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Australia
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13
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Brown HM. Mode of action, crop selectivity, and soil relations of the sulfonylurea herbicides. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/ps.2780290304] [Citation(s) in RCA: 379] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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Chipman DM, Duggleby RG, Tittmann K. Mechanisms of acetohydroxyacid synthases. Curr Opin Chem Biol 2006; 9:475-81. [PMID: 16055369 DOI: 10.1016/j.cbpa.2005.07.002] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2005] [Accepted: 07/18/2005] [Indexed: 11/17/2022]
Abstract
Acetohydroxyacid synthases are thiamin diphosphate- (ThDP-) dependent biosynthetic enzymes found in all autotrophic organisms. Over the past 4-5 years, their mechanisms have been clarified and illuminated by protein crystallography, engineered mutagenesis and detailed single-step kinetic analysis. Pairs of catalytic subunits form an intimate dimer containing two active sites, each of which lies across a dimer interface and involves both monomers. The ThDP adducts of pyruvate, acetaldehyde and the product acetohydroxyacids can be detected quantitatively after rapid quenching. Determination of the distribution of intermediates by NMR then makes it possible to calculate individual forward unimolecular rate constants. The enzyme is the target of several herbicides and structures of inhibitor-enzyme complexes explain the herbicide-enzyme interaction.
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Affiliation(s)
- David M Chipman
- Department of Life Sciences, Ben-Gurion University POB 653, Beer-Sheva 84105, Israel
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15
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Arias RS, Netherland MD, Scheffler BE, Puri A, Dayan FE. Molecular evolution of herbicide resistance to phytoene desaturase inhibitors in Hydrilla verticillata and its potential use to generate herbicide-resistant crops. PEST MANAGEMENT SCIENCE 2005; 61:258-268. [PMID: 15668922 DOI: 10.1002/ps.1022] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Hydrilla [Hydrilla verticillata (Lf) Royle] is one of the most serious invasive aquatic weed problems in the USA. This plant possesses numerous mechanisms of vegetative reproduction that enable it to spread very rapidly. Management of this weed has been achieved by the systemic treatment of water bodies with the herbicide fluridone. At least three dioecious fluridone-resistant biotypes of hydrilla with two- to fivefold higher resistance to the herbicide than the wild-type have been identified. Resistance is the result of one of three independent somatic mutations at the arginine 304 codon of the gene encoding phytoene desaturase, the molecular target site of fluridone. The specific activities of the three purified phytoene desaturase variants are similar to the wild-type enzyme. The appearance of these herbicide-resistant biotypes may jeopardize the ability to control the spread of this non-indigenous species to other water bodies in the southern USA. The objective of this paper is to provide general information about the biology and physiology of this aquatic weed in relation to its recent development of resistance to the herbicide fluridone, and to discuss how this discovery might lead to a new generation of herbicide-resistant crops.
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Affiliation(s)
- Renée S Arias
- USDA/ARS, Natural Products Utilization Research Unit, PO Box 8048, University, Mississippi 38677, USA
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16
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Tan S, Evans RR, Dahmer ML, Singh BK, Shaner DL. Imidazolinone-tolerant crops: history, current status and future. PEST MANAGEMENT SCIENCE 2005; 61:246-57. [PMID: 15627242 DOI: 10.1002/ps.993] [Citation(s) in RCA: 175] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Imidazolinone herbicides, which include imazapyr, imazapic, imazethapyr, imazamox, imazamethabenz and imazaquin, control weeds by inhibiting the enzyme acetohydroxyacid synthase (AHAS), also called acetolactate synthase (ALS). AHAS is a critical enzyme for the biosynthesis of branched-chain amino acids in plants. Several variant AHAS genes conferring imidazolinone tolerance were discovered in plants through mutagenesis and selection, and were used to create imidazolinone-tolerant maize (Zea mays L), wheat (Triticum aestivum L), rice (Oryza sativa L), oilseed rape (Brassica napus L) and sunflower (Helianthus annuus L). These crops were developed using conventional breeding methods and commercialized as Clearfield* crops from 1992 to the present. Imidazolinone herbicides control a broad spectrum of grass and broadleaf weeds in imidazolinone-tolerant crops, including weeds that are closely related to the crop itself and some key parasitic weeds. Imidazolinone-tolerant crops may also prevent rotational crop injury and injury caused by interaction between AHAS-inhibiting herbicides and insecticides. A single target-site mutation in the AHAS gene may confer tolerance to AHAS-inhibiting herbicides, so that it is technically possible to develop the imidazolinone-tolerance trait in many crops. Activities are currently directed toward the continued improvement of imidazolinone tolerance and development of new Clearfield* crops. Management of herbicide-resistant weeds and gene flow from crops to weeds are issues that must be considered with the development of any herbicide-resistant crop. Thus extensive stewardship programs have been developed to address these issues for Clearfield* crops.
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Affiliation(s)
- Siyuan Tan
- BASF Corporation, 26 Davis Drive, Research Triangle Park, NC 27709-3528, USA.
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Clowers BH, Steiner WE, Dion HM, Matz LM, Tam M, Tarver EE, Hill HH. Evaluation of sulfonylurea herbicides using high resolution electrospray ionization ion mobility quadrupole mass spectrometry. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/fact.10010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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18
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Royuela M, Gonzalez A, Arrese-Igor C, Aparicio-Tejo PM, Gonzalez-Murua C. Imazethapyr inhibition of acetolactate synthase inRhizobiumand its symbiosis with pea. ACTA ACUST UNITED AC 1999. [DOI: 10.1002/(sici)1096-9063(199804)52:4<372::aid-ps730>3.0.co;2-p] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Mader MM, Bartlett PA. Binding Energy and Catalysis: The Implications for Transition-State Analogs and Catalytic Antibodies. Chem Rev 1997; 97:1281-1302. [PMID: 11851452 DOI: 10.1021/cr960435y] [Citation(s) in RCA: 251] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mary M. Mader
- Department of Chemistry, Grinnell College, Grinnell, Iowa 50112-0806, and Department of Chemistry, University of California, Berkeley, California 94720-1460
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Ortéga F, Bastide J. Inhibition of Acetolactate Synthase Isozyme II fromEscherichia coliby a New Azido-Photoaffinity Sulfonylurea. Bioorg Chem 1997. [DOI: 10.1006/bioo.1997.1071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Seki A, Ortéga F, Marty JL. Enzyme Sensor for the Detection of Herbicides Inhibiting Acetolactate Synthase. ANAL LETT 1996. [DOI: 10.1080/00032719608001479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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22
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Hattori J, Brown D, Mourad G, Labbé H, Ouellet T, Sunohara G, Rutledge R, King J, Miki B. An acetohydroxy acid synthase mutant reveals a single site involved in multiple herbicide resistance. MOLECULAR & GENERAL GENETICS : MGG 1995; 246:419-25. [PMID: 7891655 DOI: 10.1007/bf00290445] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Acetohydroxy acid synthase (AHAS) is an essential enzyme for many organisms as it catalyzes the first step in the biosynthesis of the branched-chain amino acids valine, isoleucine, and leucine. The enzyme is under allosteric control by these amino acids. It is also inhibited by several classes of herbicides, such as the sulfonylureas, imidazolinones and triazolopyrimidines, that are believed to bind to a relic quinone-binding site. In this study, a mutant allele of AHAS3 responsible for sulfonylurea resistance in a Brassica napus cell line was isolated. Sequence analyses predicted a single amino acid change (557 Trp-->Leu) within a conserved region of AHAS. Expression in transgenic plants conferred strong resistance to the three classes of herbicides, revealing a single site essential for the binding of all the herbicide classes. The mutation did not appear to affect feedback inhibition by the branched-chain amino acids in plants.
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Affiliation(s)
- J Hattori
- Plant Research Centre, Agriculture Canada, C. E. F. Ottawa, Ontario
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