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Milani A, Panozzo S, Grazia TM, Scarabel L. Development of a rapid detection assay for acetolactate synthase inhibitors resistance in three Amaranthus weed species through loop-mediated isothermal amplification. J Sci Food Agric 2024. [PMID: 38358049 DOI: 10.1002/jsfa.13385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/07/2024] [Accepted: 02/15/2024] [Indexed: 02/16/2024]
Abstract
BACKGROUND The early detection of herbicide resistance in weeds is a key factor to avoid herbicide waste and improve agriculture sustainability. The present study aimed to develop and validate an allele-specific loop-mediated isothermal amplification (AS-LAMP) assay for the quick on-site detection of the resistance-endowing point mutation Trp-574-Leu in the acetolactate synthase (ALS) gene in three widely diffused Amaranthus weed species: Amaranthus retroflexus, Amaranthus hybridus and Amaranthus tuberculatus. RESULTS The AS-LAMP protocol was developed on wild-type and ALS-mutant plants of the three species and revealed that the amplification approach with only the primer set specific for the mutant allele (574-Leu) was the most promising. The validation and estimation of the AS-LAMP performance evaluated by comparing the results with those of the molecular marker (cleaved amplified polymorphic sequences) indicated that, although the sensitivity and specificity were relatively high in all species (overall 100 and > 65%, respectively), precision was high for A. hybridus L. and A. retroflexus L. (75 and 79%, respectively), but quite low for A. tuberculatus (Moq.) J. D. Sauer (59%). The LAMP assay was also effective on crude genomic DNA extraction, allowing the quick detection of mutant plants in field situation (on site resistance detection). CONCLUSION The proposed AS-LAMP method has proven to be a promising technique for rapid detection of resistance as a result of Trp-574-Leu on the two monoecious weedy Amaranthus species but resulted less effective in the genetically variable dioecious species A. tuberculatus. © 2024 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Andrea Milani
- Institute for Sustainable Plant Protection (IPSP-CNR), Legnaro, Italy
| | - Silvia Panozzo
- Institute for Sustainable Plant Protection (IPSP-CNR), Legnaro, Italy
| | | | - Laura Scarabel
- Institute for Sustainable Plant Protection (IPSP-CNR), Legnaro, Italy
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Manicardi A, Scarabel L, Llenes JM, Montull JM, Osuna MD, Torra Farré J, Milani A. Genetic basis and origin of resistance to acetolactate synthase inhibitors in Amaranthus palmeri from Spain and Italy. Pest Manag Sci 2023; 79:4886-4896. [PMID: 37515753 DOI: 10.1002/ps.7690] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/19/2023] [Accepted: 07/29/2023] [Indexed: 07/31/2023]
Abstract
BACKGROUND Amaranthus palmeri is an aggressive annual weed native to the United States, which has become invasive in some European countries. Populations resistant to acetolactate synthase (ALS) inhibitors have been recorded in Spain and Italy, but the evolutionary origin of the resistance traits remains unknown. Bioassays were conducted to identify cross-resistance to ALS inhibitors and a haplotype-based genetic approach was used to elucidate the origin and distribution of resistance in both countries. RESULTS Amaranthus palmeri populations were resistant to thifensulfuron-methyl and imazamox, and the 574-Leu mutant ALS allele was found to be the main cause of resistance among them. In two Spanish populations, 376-Glu and 197-Thr mutant ALS alleles were also found. The haplotype analyses revealed the presence of two and four distinct 574-Leu mutant haplotypes in the Italian and Spanish populations, respectively. None was common to both countries, but some mutant haplotypes were shared between geographically close populations or between populations more than 100 km apart. Wide genetic diversity was found in two very close Spanish populations. CONCLUSION ALS-resistant A. palmeri populations were introduced to Italy and Spain from outside Europe. Populations from both countries have different evolutionary histories and originate from independent introduction events. ALS resistance then spread over short and long distances by seed dispersal. The higher number and genetic diversity among mutant haplotypes from the Spanish populations indicated recurrent invasions. The implementation of control tactics to limit seed dispersal and the establishment of A. palmeri is recommended in both countries. © 2023 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Alfredo Manicardi
- Department of Forestry and Agricultural Science and Engineering, University of Lleida, Lleida, Spain
| | - Laura Scarabel
- Institute for Sustainable Plant Protection (IPSP), CNR, Legnaro, Italy
| | - Josep María Llenes
- Weed Science Unit of the Plant Protection Service, DARP, Generalitat de Catalunya, Lleida, Spain
| | - José María Montull
- Department of Forestry and Agricultural Science and Engineering, University of Lleida, Lleida, Spain
| | - María Dolores Osuna
- Plant Protection Department, Extremadura Scientific and Technological Research Center (CICYTEX), Badajoz, Spain
| | - Joel Torra Farré
- Department of Forestry and Agricultural Science and Engineering, University of Lleida, Lleida, Spain
| | - Andrea Milani
- Institute for Sustainable Plant Protection (IPSP), CNR, Legnaro, Italy
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Bignucolo A, De Mattia E, Roncato R, Peruzzi E, Scarabel L, D’Andrea M, Sartor F, Toffoli G, Cecchin E. Ten-year experience with pharmacogenetic testing for DPYD in a national cancer center in Italy: Lessons learned on the path to implementation. Front Pharmacol 2023; 14:1199462. [PMID: 37256229 PMCID: PMC10225682 DOI: 10.3389/fphar.2023.1199462] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 05/05/2023] [Indexed: 06/01/2023] Open
Abstract
Background: Awareness about the importance of implementing DPYD pharmacogenetics in clinical practice to prevent severe side effects related to the use of fluoropyrimidines has been raised over the years. Since 2012 at the National Cancer Institute, CRO-Aviano (Italy), a diagnostic DPYD genotyping service was set up. Purpose: This study aims to describe the evolution of DPYD diagnostic activity at our center over the last 10 years as a case example of a successful introduction of pharmacogenetic testing in clinical practice. Methods: Data related to the diagnostic activity of in-and out-patients referred to our service between January 2012 and December 2022 were retrieved from the hospital database. Results: DPYD diagnostic activity at our center has greatly evolved over the years, shifting gradually from a post-toxicity to a pre-treatment approach. Development of pharmacogenetic guidelines by national and international consortia, genotyping, and IT technology evolution have impacted DPYD testing uptake in the clinics. Our participation in a large prospective implementation study (Ubiquitous Pharmacogenomics) increased health practitioners' and patients' awareness of pharmacogenetic matters and provided additional standardized infrastructures for genotyping and reporting. Nationwide test reimbursement together with recommendations by regulatory agencies in Europe and Italy in 2020 definitely changed the clinical practice guidelines of fluoropyrimidines prescription. A dramatic increase in the number of pre-treatment DPYD genotyping and in the coverage of new fluoropyrimidine prescriptions was noticed by the last year of observation (2022). Conclusion: The long path to a successful DPYD testing implementation in the clinical practice of a National Cancer Center in Italy demonstrated that the development of pharmacogenetic guidelines and genotyping infrastructure standardization as well as capillary training and education activity for all the potential stakeholders are fundamental. However, only national health politics of test reimbursement and clear recommendations by drug regulatory agencies will definitely move the field forward.
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Panozzo S, Farinati S, Sattin M, Scarabel L. Can allele-specific loop-mediated isothermal amplification be used for rapid detection of target-site herbicide resistance in Lolium spp.? Plant Methods 2023; 19:14. [PMID: 36750938 PMCID: PMC9906911 DOI: 10.1186/s13007-023-00989-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 01/26/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Herbicide resistance is one of the threats to modern agriculture and its early detection is one of the most effective components for sustainable resistance management strategies. Many techniques have been used for target-site-resistance detection. Allele-Specific Loop-Mediated Isothermal Amplification (AS-LAMP) was evaluated as a possible rapid diagnostic method for acetyl-CoA carboxylase (ACCase) and acetolactate synthase (ALS) inhibiting herbicides resistance in Lolium spp. RESULTS AS-LAMP protocols were set up for the most frequent mutations responsible for herbicide resistance to ALS (positions 197, 376 and 574) and ACCase (positions 1781, 2041 and 2078) inhibitors in previously characterized and genotyped Lolium spp. POPULATIONS A validation step on new putative resistant populations gave the overview of a possible use of this tool for herbicide resistance diagnosis in Lolium spp. Regarding the ACCase inhibitor pinoxaden, in more than 65% of the analysed plants, the LAMP assay and genotyping were in keeping, whereas the results were not consistent when ALS inhibitors resistance was considered. Limitations on the use of this technique for herbicide resistance detection in the allogamous Lolium spp. are discussed. CONCLUSIONS The LAMP method used for the detection of target-site resistance in weed species could be applicable with target genes that do not have high genetic variability, such as ACCase gene in Lolium spp.
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Affiliation(s)
- Silvia Panozzo
- Institute for Sustainable Plant Protection (IPSP) - National Research Council (CNR), viale dell'Università 16, 35020, Legnaro, PD, Italy.
| | - Silvia Farinati
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova, Padova, Italy
| | - Maurizio Sattin
- Institute for Sustainable Plant Protection (IPSP) - National Research Council (CNR), viale dell'Università 16, 35020, Legnaro, PD, Italy
| | - Laura Scarabel
- Institute for Sustainable Plant Protection (IPSP) - National Research Council (CNR), viale dell'Università 16, 35020, Legnaro, PD, Italy
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Milani A, Panozzo S, Pinton S, Danielis RA, Sattin M, Scarabel L. Diversity and Spread of Acetolactate Synthase Allelic Variants at Position 574 Endowing Resistance in Amaranthus hybridus in Italy. Plants (Basel) 2023; 12:332. [PMID: 36679045 PMCID: PMC9860533 DOI: 10.3390/plants12020332] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/27/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
Poor control of Amaranthus spp. with herbicides inhibiting acetolactate synthase (ALS) has been observed for several years in soybean fields in north-eastern Italy, but to date only a few ALS-resistant populations have been confirmed. An extensive sampling of putatively resistant Amaranthus accessions was completed in the Friuli Venezia Giulia region, across an arable land area of about 3000 km2. In total, 58 accessions were tested to confirm their resistance status, recognize the Amaranthus species, identify the mutant ALS alleles endowing the resistance and determine the efficacy of 3 pre-emergence herbicides. Most accessions resulted in cross-resistance to thifensulfuron-methyl and imazamox. Genomic DNA were extracted from single seeds with a newly developed protocol; an allele-specific PCR assay revealed the presence of the 574-leucine in 20 accessions, of the 574-methionine in 22, and of both alleles in 9 accessions. The two variants showed a different spatial distribution. All resistant populations were ascribed to A. hybridus. A. hybridus resistant to ALS herbicides is well-established in this Italian region and its resistance is due to two ALS mutant alleles. Metribuzin, clomazone and metobromuron can be used as alternative herbicides to be applied in pre-emergence and they should be integrated into the management strategies to limit the spread of resistance.
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Affiliation(s)
- Andrea Milani
- Institute for Sustainable Plant Protection (IPSP-CNR), 35020 Legnaro, Italy
| | - Silvia Panozzo
- Institute for Sustainable Plant Protection (IPSP-CNR), 35020 Legnaro, Italy
| | - Samuele Pinton
- Institute for Sustainable Plant Protection (IPSP-CNR), 35020 Legnaro, Italy
| | - Renato Antonio Danielis
- Regional Agency for Rural Development of Friuli Venezia Giulia (ERSA), 33050 Pozzuolo del Friuli, Italy
| | - Maurizio Sattin
- Institute for Sustainable Plant Protection (IPSP-CNR), 35020 Legnaro, Italy
| | - Laura Scarabel
- Institute for Sustainable Plant Protection (IPSP-CNR), 35020 Legnaro, Italy
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Wu D, Shen E, Jiang B, Feng Y, Tang W, Lao S, Jia L, Lin HY, Xie L, Weng X, Dong C, Qian Q, Lin F, Xu H, Lu H, Cutti L, Chen H, Deng S, Guo L, Chuah TS, Song BK, Scarabel L, Qiu J, Zhu QH, Yu Q, Timko MP, Yamaguchi H, Merotto A, Qiu Y, Olsen KM, Fan L, Ye CY. Genomic insights into the evolution of Echinochloa species as weed and orphan crop. Nat Commun 2022; 13:689. [PMID: 35115514 PMCID: PMC8814039 DOI: 10.1038/s41467-022-28359-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 01/20/2022] [Indexed: 12/20/2022] Open
Abstract
As one of the great survivors of the plant kingdom, barnyard grasses (Echinochloa spp.) are the most noxious and common weeds in paddy ecosystems. Meanwhile, at least two Echinochloa species have been domesticated and cultivated as millets. In order to better understand the genomic forces driving the evolution of Echinochloa species toward weed and crop characteristics, we assemble genomes of three Echinochloa species (allohexaploid E. crus-galli and E. colona, and allotetraploid E. oryzicola) and re-sequence 737 accessions of barnyard grasses and millets from 16 rice-producing countries. Phylogenomic and comparative genomic analyses reveal the complex and reticulate evolution in the speciation of Echinochloa polyploids and provide evidence of constrained disease-related gene copy numbers in Echinochloa. A population-level investigation uncovers deep population differentiation for local adaptation, multiple target-site herbicide resistance mutations of barnyard grasses, and limited domestication of barnyard millets. Our results provide genomic insights into the dual roles of Echinochloa species as weeds and crops as well as essential resources for studying plant polyploidization, adaptation, precision weed control and millet improvements.
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Affiliation(s)
- Dongya Wu
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Enhui Shen
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
- Zhejiang University Zhongyuan Institute, Zhengzhou, 450000, China
| | - Bowen Jiang
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Yu Feng
- Institute of Ecology, Zhejiang University, Hangzhou, 310058, China
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Wei Tang
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
| | - Sangting Lao
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Lei Jia
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Han-Yang Lin
- Institute of Ecology, Zhejiang University, Hangzhou, 310058, China
| | - Lingjuan Xie
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Xifang Weng
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Chenfeng Dong
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Qinghong Qian
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Feng Lin
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Haiming Xu
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
| | - Huabing Lu
- Institute of Maize and Upland Grain, Zhejiang Academy of Agricultural Sciences, Dongyang, 322105, China
| | - Luan Cutti
- Department of Crop Sciences, Agricultural School, Federal University of Rio Grande do Sul, Porto Alegre, RS, 91540-000, Brazil
| | - Huajun Chen
- College of Computer Science and Technology, Zhejiang University, Hangzhou, 310058, China
| | - Shuiguang Deng
- College of Computer Science and Technology, Zhejiang University, Hangzhou, 310058, China
| | - Longbiao Guo
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
| | - Tse-Seng Chuah
- Faculty of Plantation and Agrotechnology, Universiti Teknologi MARA, 02600, Arau, Perlis, Malaysia
| | - Beng-Kah Song
- School of Science, Monash University Malaysia, 46150, Bandar Sunway, Selangor, Malaysia
| | - Laura Scarabel
- Istituto per la Protezione Sostenibile delle Piante (IPSP), CNR, Viale dell'Università, 16, 35020, Legnaro (PD), Italy
| | - Jie Qiu
- Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, 200235, China
| | - Qian-Hao Zhu
- CSIRO Agriculture and Food, GPO Box 1700, Canberra, ACT, 2601, Australia
| | - Qin Yu
- Australian Herbicide Resistance Initiative, School of Agriculture and Environment, University of Western Australia, Crawley, WA, 6009, Australia
| | - Michael P Timko
- Department of Biology, University of Virginia, Charlottesville, VA, 22904, USA
| | | | - Aldo Merotto
- Department of Crop Sciences, Agricultural School, Federal University of Rio Grande do Sul, Porto Alegre, RS, 91540-000, Brazil
| | - Yingxiong Qiu
- Institute of Ecology, Zhejiang University, Hangzhou, 310058, China
| | - Kenneth M Olsen
- Department of Biology, Washington University in St. Louis, St. Louis, MO, 63130, USA
| | - Longjiang Fan
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China
- Zhejiang University Zhongyuan Institute, Zhengzhou, 450000, China
| | - Chu-Yu Ye
- Institute of Crop Science & Institute of Bioinformatics, Zhejiang University, Hangzhou, 310058, China.
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Milani A, Lutz U, Galla G, Scarabel L, Weigel D, Sattin M. Population structure and evolution of resistance to acetolactate synthase (ALS)-inhibitors in Amaranthus tuberculatus in Italy. Pest Manag Sci 2021; 77:2971-2980. [PMID: 33631029 PMCID: PMC8251816 DOI: 10.1002/ps.6336] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 02/12/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Before 2010, Amaranthus tuberculatus (Moq.) J. D. Sauer was barely known to farmers and stakeholders in Italy. Since then, several populations resistant to acetolactate synthase (ALS)-inhibiting herbicides have been collected. In most populations, a known target site resistance-endowing mutation was found, a Trp to Leu substitution at position 574 of the ALS gene, but it was unclear whether they had evolved resistance independently or not. The aims of the work were (i) to elucidate the population structure of Italian ALS-resistant A. tuberculatus populations, and (ii) to analyze the ALS haplotypes of the various populations to determine whether resistance arose multiple times independently. RESULTS In order to determine the population structure of eight A. tuberculatus populations, eight previously described microsatellite loci were used. Two ancestors were found: three populations derived from one, and five from the other. In the 4-kb ALS region of the genome, including the 2-kb coding region, 389 single nucleotide polymorphisms were found. In silico haplotype estimation was used to reconstruct the sequence of three distinct haplotypes carrying the Trp574Leu mutation. In addition, no mutation was found in 83% of plants of a single population. CONCLUSIONS (i) Resistance must have arisen independently at least three times; (ii) at least one population was already resistant to ALS inhibitors when introduced in Italy; (iii) a single haplotype with a Trp574Leu mutation was shared among six populations, probably because of broad seed dispersal; and (iv) one population likely evolved nontarget site ALS inhibitors resistance. © 2021 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Andrea Milani
- Institute for Sustainable Plant Protection (IPSP‐CNR)LegnaroItaly
| | - Ulrich Lutz
- Max Planck Institute for Developmental BiologyTübingenGermany
| | | | - Laura Scarabel
- Institute for Sustainable Plant Protection (IPSP‐CNR)LegnaroItaly
| | - Detlef Weigel
- Max Planck Institute for Developmental BiologyTübingenGermany
| | - Maurizio Sattin
- Institute for Sustainable Plant Protection (IPSP‐CNR)LegnaroItaly
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Scarabel L, Panozzo S, Loddo D, Mathiassen SK, Kristensen M, Kudsk P, Gitsopoulos T, Travlos I, Tani E, Chachalis D, Sattin M. Diversified Resistance Mechanisms in Multi-Resistant Lolium spp. in Three European Countries. Front Plant Sci 2020; 11:608845. [PMID: 33384707 PMCID: PMC7769757 DOI: 10.3389/fpls.2020.608845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 11/20/2020] [Indexed: 06/12/2023]
Abstract
Annual ryegrass species (Lolium spp.) infest cereal crops worldwide. Ryegrass populations with multiple resistance to the acetyl coenzyme A carboxylase (ACCase) and acetolactate synthase (ALS) inhibitors are an increasing problem in several European countries. We investigated the resistance pattern and level of resistance in ryegrass populations collected in Denmark, Greece and Italy and studied the diversity of mechanisms endowing resistance, both target-site and metabolism based. All populations showed high resistance indexes (RI) to the ALS inhibitors, iodosufuron-methyl-sodium + mesosulfuron-methyl (RI from 8 to 70), whereas the responses to the two ACCase inhibitors, clodinafop-propargyl and pinoxaden, differed. The Greek and Italian populations were moderately to highly resistant to clodinafop (RI > 8) and showed low to moderate resistance to pinoxaden (RI ranged from 3 to 13) except for one Italian population. In contrast, the Danish Lolium populations showed low to moderate resistance to clodinafop (RI ranged from 2 to 7) and only one population was resistant to pinoxaden. Different mutant ACCase alleles (Leu1781, Cys2027, Asn2041, Val2041, Gly2078, Arg2088, Ala2096) and ALS alleles (Gly122, Ala197, Gln197, Leu197, Ser197, Thr197, Val205, Asn376, Glu376, Leu574) endowing resistance were detected in the Greek and Italian populations. In several plants, no mutated ALS and ACCase alleles were found showing a great heterogeneity within and among the Greek and Italian populations. Conversely, no mutant ACCase alleles were identified in the four Danish populations and only one mutant ALS allele (Leu574) was detected in two Danish populations. The expression level of nitronate monooxygenase (NMO), glutathione S-transferase (GST) and cytochrome P450s (CYP72A1 and CYP72A2) varied broadly among populations and individual plants within the populations. Constitutive up-regulation of GST, CYP72A1 and CYP72A2 was detected in resistant plants respect to susceptible plants in one Danish and one Italian population. It appears that the mechanisms underlying resistance are rather complex and diversified among Lolium spp. populations from the three countries, coevolution of both target-site resistance and metabolic based herbicide resistance appears to be a common feature in Denmark and Italy. This must be considered and carefully evaluated in adopting resistance management strategies to control Lolium spp. in cereal crops.
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Affiliation(s)
- Laura Scarabel
- Institute for Sustainable Plant Protection (IPSP-CNR), National Research Council of Italy, Padua, Italy
| | - Silvia Panozzo
- Institute for Sustainable Plant Protection (IPSP-CNR), National Research Council of Italy, Padua, Italy
| | - Donato Loddo
- Institute for Sustainable Plant Protection (IPSP-CNR), National Research Council of Italy, Padua, Italy
| | | | | | - Per Kudsk
- Department of Agroecology, Aarhus University, Flakkebjerg, Denmark
| | - Thomas Gitsopoulos
- Institute of Plant Breeding and Genetic Resources, Hellenic Agricultural Organization-Demeter, Thessaloniki, Greece
| | - Ilias Travlos
- Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | - Eleni Tani
- Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | | | - Maurizio Sattin
- Institute for Sustainable Plant Protection (IPSP-CNR), National Research Council of Italy, Padua, Italy
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Milani A, Scarabel L, Sattin M. A family affair: resistance mechanism and alternative control of three Amaranthus species resistant to acetolactate synthase inhibitors in Italy. Pest Manag Sci 2020; 76:1205-1213. [PMID: 31677230 DOI: 10.1002/ps.5667] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 10/28/2019] [Accepted: 10/29/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Several soybean fields in Italy were found to be infested by multiple species of Amaranthus spp. not adequately controlled by acetolactate (ALS) inhibitor herbicides. The objectives of this research were (i) to create a simplified botanical key to identify weedy amaranths; (ii) to determine the number and type of sites of action the accession are resistant to, i.e. resistance pattern; and (iii) to determine the main resistance mechanisms involved d) to evaluate the efficacy of herbicides with different site of action. RESULTS An easy-to-use botanical key was devised and successfully used in the infested sites and results were confirmed through a species-specific molecular marker. Amaranthus retroflexus L. (redrood pigweed) was found in three sites; plants with Asp376 Glu substitution at the ALS gene were resistant to thifensulfuron-methyl. Amaranthus tuberculatus (Moq.) J.D.Sauer (waterhemp) and Amaranthus hybridus L. (smooth pigweed) accessions were cross-resistant to thifensulfuron-methyl and imazamox; most ALS-resistant plants had a point mutation at position 574. One A. hybridus accession had the substitution Trp574 Met, new for Amaranthus genus. All ALS-resistant accessions were controlled by glyphosate and metribuzin. A. retroflexus accessions were controlled by bentazon, instead an A. hybridus and some A. tuberculatus accession were not. CONCLUSIONS The simplified botanical key proposed herein could be a useful tool for farmers and weed scientists to reliably identify Amaranthus species in the field. The main resistance mechanism in the three Amaranthus species is target-site mediated. This is the first evidence of ALS-resistant A. tuberculatus outside its native North American range. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Andrea Milani
- Department of Agronomy, Food, Natural Resources, Animals & Environment, University of Padova, Padua, Italy
| | - Laura Scarabel
- Institute for Sustainable Plant Protection (IPSP-CNR), National Research Council of Italy (CNR), Viale dell'Università 16, Legnaro, Padua, Italy
| | - Maurizio Sattin
- Institute for Sustainable Plant Protection (IPSP-CNR), National Research Council of Italy (CNR), Viale dell'Università 16, Legnaro, Padua, Italy
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Qiu J, Jia L, Wu D, Weng X, Chen L, Sun J, Chen M, Mao L, Jiang B, Ye C, Turra GM, Guo L, Ye G, Zhu QH, Imaizumi T, Song BK, Scarabel L, Merotto A, Olsen KM, Fan L. Diverse genetic mechanisms underlie worldwide convergent rice feralization. Genome Biol 2020; 21:70. [PMID: 32213201 PMCID: PMC7098168 DOI: 10.1186/s13059-020-01980-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 03/02/2020] [Indexed: 11/21/2022] Open
Abstract
Background Worldwide feralization of crop species into agricultural weeds threatens global food security. Weedy rice is a feral form of rice that infests paddies worldwide and aggressively outcompetes cultivated varieties. Despite increasing attention in recent years, a comprehensive understanding of the origins of weedy crop relatives and how a universal feralization process acts at the genomic and molecular level to allow the rapid adaptation to weediness are still yet to be explored. Results We use whole-genome sequencing to examine the origin and adaptation of 524 global weedy rice samples representing all major regions of rice cultivation. Weed populations have evolved multiple times from cultivated rice, and a strikingly high proportion of contemporary Asian weed strains can be traced to a few Green Revolution cultivars that were widely grown in the late twentieth century. Latin American weedy rice stands out in having originated through extensive hybridization. Selection scans indicate that most genomic regions underlying weedy adaptations do not overlap with domestication targets of selection, suggesting that feralization occurs largely through changes at loci unrelated to domestication. Conclusions This is the first investigation to provide detailed genomic characterizations of weedy rice on a global scale, and the results reveal diverse genetic mechanisms underlying worldwide convergent rice feralization. Electronic supplementary material The online version of this article (10.1186/s13059-020-01980-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jie Qiu
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China.,Shanghai Key Laboratory of Plant Molecular Sciences, College of Life Sciences, Shanghai Normal University, Shanghai, 200235, China
| | - Lei Jia
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Dongya Wu
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Xifang Weng
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Lijuan Chen
- Rice Research Institute, Yunnan Agricultural University, Kunming, China
| | - Jian Sun
- Rice Research Institute, Shenyang Agricultural University, Shenyang, China
| | - Meihong Chen
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Lingfeng Mao
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Bowen Jiang
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Chuyu Ye
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Guilherme Menegol Turra
- Department of Crop Sciences, Agricultural School, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Longbiao Guo
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China
| | - Guoyou Ye
- International Rice Research Institute (IRRI), Manila, Philippines
| | - Qian-Hao Zhu
- CSIRO Agriculture and Food, GPO Box 1700, Canberra, ACT, 2601, Australia
| | - Toshiyuki Imaizumi
- National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, 305-8666, Japan
| | - Beng-Kah Song
- School of Science, Monash University Malaysia, 46150, Bandar Sunway, Selangor, Malaysia
| | - Laura Scarabel
- Istituto per la Protezione Sostenibile delle Piante (IPSP), CNR, Viale dell'Università, 16, 35020, Legnaro, PD, Italy
| | - Aldo Merotto
- Department of Crop Sciences, Agricultural School, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Kenneth M Olsen
- Department of Biology, Washington University in St. Louis, St. Louis, MO, 63130, USA.
| | - Longjiang Fan
- Institute of Crop Sciences and Institute of Bioinformatics, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China. .,James D. Watson Institute of Genome Sciences, Zhejiang University, Hangzhou, 310058, China.
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Scarabel L, Milani A, Panozzo S, Rasori A. Suitable reference genes for accurate gene expression analysis in Papaver rhoeas under 2,4-D herbicide stress. Pestic Biochem Physiol 2017; 143:66-72. [PMID: 29183612 DOI: 10.1016/j.pestbp.2017.09.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 09/07/2017] [Accepted: 09/16/2017] [Indexed: 05/10/2023]
Abstract
Resistance to 2,4-D (2,4-diclorophenoxyacetic acid) herbicide is increasing in various dicotyledonous weed species, including Papaver rhoeas, a weed infesting Southern European wheat crops. Non-target-site resistance to this herbicide is governed by a range of genes involved in herbicide stress response. To enable reliable measurement of gene expression levels in herbicide-resistant and susceptible plants it is necessary to normalize qPCR data using internal control genes with stable expression. In an attempt to find the best reference genes, the stability of seven candidate reference genes was assessed in plants resistant and susceptible to 2,4-D, subjected or not to herbicide stress. Using three statistical algorithms (geNorm, BestKeeper and NormFinder), the overall results revealed that glyceraldehyde-3-phosphate dehydrogenase, actin and ubiquitin were the most stable reference genes. The normalization expression levels of GH3 (indole-3-acetic acid amido synthetase) and GST3 (glutathione S-transferase) which are two genes up-regulated following 2,4-D treatment, were determined to verify the stability of these selected reference genes. A sudden increase in GH3 and GST3 expression was already detected 5h after herbicide application, confirming their involvement in plant response to 2,4-D. The validation results confirmed the applicability and accuracy of these reference genes. This study identified and validated reference genes in the non-model weed species P. rhoeas and these will facilitate gene expression analysis studies aimed at identifying functional genes associated with non-target-site resistance.
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Affiliation(s)
- L Scarabel
- Institute of Agro-Environmental and Forest Biology- CNR, Legnaro, Padua, Italy.
| | - A Milani
- Institute of Agro-Environmental and Forest Biology- CNR, Legnaro, Padua, Italy
| | - S Panozzo
- Institute of Agro-Environmental and Forest Biology- CNR, Legnaro, Padua, Italy
| | - A Rasori
- Department of Agronomy, Food, Natural Resources, Animals & Environment, University of Padova, Legnaro, Padua, Italy
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Panozzo S, Milani A, Scarabel L, Balogh Á, Dancza I, Sattin M. Occurrence of Different Resistance Mechanisms to Acetolactate Synthase Inhibitors in European Sorghum halepense. J Agric Food Chem 2017; 65:7320-7327. [PMID: 28767243 DOI: 10.1021/acs.jafc.7b01243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Four Hungarian and two Italian Sorghum halepense populations harvested in maize fields were investigated to elucidate the levels and mechanisms underlying acetolactate synthase (ALS) inhibitors resistance. The two Italian populations were highly cross-resistant to all ALS inhibitors tested, and the variant ALS allele Leu574 was identified in most of the plants; no differences were observed when the plants were treated with herbicide plus malathion. This suggests that the main resistance mechanism is target-site mediated. The Hungarian populations proved to be controlled by imazamox, while they were resistant to sulfonylureas and bispyribac-Na. All Hungarian populations, but not all plants of population 12-49H, presented the variant allele Glu376. This is the first documented occurrence of the Asp-376-Glu substitution in S. halepense. ALS enzyme bioassay and treatment with malathion confirmed that at least in plants of two populations the resistance is very likely due to both target-site and enhanced metabolism of P450 enzymes.
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Affiliation(s)
- Silvia Panozzo
- Institute of Agro-environmental and Forest Biology (IBAF) - CNR , viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - Andrea Milani
- Institute of Agro-environmental and Forest Biology (IBAF) - CNR , viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - Laura Scarabel
- Institute of Agro-environmental and Forest Biology (IBAF) - CNR , viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - Ákos Balogh
- Syngenta Crop Protection AG , Schwarzwaldallee 215, CH-4058 Basel, Switzerland
| | - Istvan Dancza
- Syngenta Kft. , Aliz. str. 2, H-1117 Budapest, Hungary
| | - Maurizio Sattin
- Institute of Agro-environmental and Forest Biology (IBAF) - CNR , viale dell'Università 16, 35020 Legnaro, PD, Italy
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Panozzo S, Scarabel L, Rosan V, Sattin M. A New Ala-122-Asn Amino Acid Change Confers Decreased Fitness to ALS-Resistant Echinochloa crus-galli. Front Plant Sci 2017; 8:2042. [PMID: 29234345 PMCID: PMC5712356 DOI: 10.3389/fpls.2017.02042] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Accepted: 11/14/2017] [Indexed: 05/12/2023]
Abstract
Gene mutations conferring herbicide resistance may cause pleiotropic effects on plant fitness. Knowledge of these effects is important for managing the evolution of herbicide-resistant weeds. An Echinochloa crus-galli population resistant to acetolactate synthase (ALS) herbicides was collected in a maize field in north-eastern Italy and the cross-resistance pattern, resistance mechanism and fitness costs associated to mutant-resistant plants under field conditions in the presence or absence of intra-specific competition were determined. The study reports for the first time the Ala-122-Asn amino-acid change in the ALS gene that confers high levels of cross-resistance to all ALS inhibitors tested. Results of 3-year growth analysis showed that mutant resistant E. crus-galli plants had a delayed development in comparison with susceptible plants and this was registered in both competitive (3, 7, and 20 plants m-2) and non-competitive (spaced plants) situations. The number of panicles produced by resistant plants was also lower (about 40% fewer panicles) than susceptible plants under no-intraspecific competition. Instead, with the increasing competition level, the difference in panicle production at harvest time decreased until it became negligible at 20 plants m-2. Evaluation of total dry biomass as well as biomass allocation in vegetative parts did not highlight any difference between resistant and susceptible plants. Instead, panicle dry weight was higher in susceptible plants indicating that they allocated more biomass than resistant ones to the reproductive organs, especially in no-competition and in competition situations at lower plant densities. The different fitness between resistant and susceptible phenotypes suggests that keeping the infestation density as low as possible can increase the reproduction success of the susceptible phenotype and therefore contribute to lowering the ratio between resistant and susceptible alleles. If adequately embedded in a medium or long-term integrated weed management strategy, the presence of R plants with a fitness penalty provides an opportunity to minimize or reverse herbicide resistance evolution through the implementation of integrated weed management, i.e., all possible control tools available.
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Scarabel L, Pernin F, Délye C. Occurrence, genetic control and evolution of non-target-site based resistance to herbicides inhibiting acetolactate synthase (ALS) in the dicot weed Papaver rhoeas. Plant Sci 2015; 238:158-69. [PMID: 26259184 DOI: 10.1016/j.plantsci.2015.06.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 06/01/2015] [Accepted: 06/06/2015] [Indexed: 05/08/2023]
Abstract
Non-target-site resistance (NTSR) to herbicides is a major issue for the chemical control of weeds. Whilst predominant in grass weeds, NTSR remains largely uninvestigated in dicot weeds. We investigated the occurrence, inheritance and genetic control of NTSR to acetolactate synthase (ALS) inhibitors in Papaver rhoeas (corn poppy) using progenies from plants with potential NTSR to the imidazolinone herbicide imazamox. NTSR to imazamox was inherited from parents over two successive generations. NTSR to tritosulfuron (a sulfonylurea) was observed in F1 generations and inherited in F2 generations. NTSR to florasulam (a triazolopyrimidine) emerged in F2 generations. Our findings suggest NTSR was polygenic and gradually built-up by accumulation over generations of loci with moderate individual effects in single plants. We also demonstrated that ALS alleles conferring herbicide resistance can co-exist with NTSR loci in P. rhoeas plants. Previous research focussed on TSR in P. rhoeas, which most likely caused underestimation of NTSR significance in this species. This may also apply to other dicot species. From our data, resistance to ALS inhibitors in P. rhoeas appears complex, and involves well-known mutant ALS alleles and a set of unknown NTSR loci that confer resistance to ALS inhibitors from different chemical families.
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Affiliation(s)
- Laura Scarabel
- Institute of Agro-environmental and Forest Biology (IBAF), CNR, AGRIPOLIS, Viale dell'Università 16, 35020 Legnaro (PD), Italy.
| | - Fanny Pernin
- INRA, UMR1347 Agroécologie, 17 rue de Sully, F-21000 Dijon, France.
| | - Christophe Délye
- INRA, UMR1347 Agroécologie, 17 rue de Sully, F-21000 Dijon, France.
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Panozzo S, Colauzzi M, Scarabel L, Collavo A, Rosan V, Sattin M. iMAR: An Interactive Web-Based Application for Mapping Herbicide Resistant Weeds. PLoS One 2015; 10:e0135328. [PMID: 26266545 PMCID: PMC4534039 DOI: 10.1371/journal.pone.0135328] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 07/19/2015] [Indexed: 02/05/2023] Open
Abstract
Herbicides are the major weed control tool in most cropping systems worldwide. However, the high reliance on herbicides has led to environmental issues as well as to the evolution of herbicide-resistant biotypes. Resistance is a major concern in modern agriculture and early detection of resistant biotypes is therefore crucial for its management and prevention. In this context, a timely update of resistance biotypes distribution is fundamental to devise and implement efficient resistance management strategies. Here we present an innovative web-based application called iMAR (interactive MApping of Resistance) for the mapping of herbicide resistant biotypes. It is based on open source software tools and translates into maps the data reported in the GIRE (Italian herbicide resistance working group) database of herbicide resistance at national level. iMAR allows an automatic, easy and cost-effective updating of the maps a nd provides two different systems, "static" and "dynamic". In the first one, the user choices are guided by a hierarchical tree menu, whereas the latter is more flexible and includes a multiple choice criteria (type of resistance, weed species, region, cropping systems) that permits customized maps to be created. The generated information can be useful to various stakeholders who are involved in weed resistance management: farmers, advisors, national and local decision makers as well as the agrochemical industry. iMAR is freely available, and the system has the potential to handle large datasets and to be used for other purposes with geographical implications, such as the mapping of invasive plants or pests.
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Affiliation(s)
- Silvia Panozzo
- National Research Council (CNR)—Institute of Agro-environmental and Forest Biology (IBAF), Legnaro (PD), Italy
| | | | - Laura Scarabel
- National Research Council (CNR)—Institute of Agro-environmental and Forest Biology (IBAF), Legnaro (PD), Italy
| | - Alberto Collavo
- National Research Council (CNR)—Institute of Agro-environmental and Forest Biology (IBAF), Legnaro (PD), Italy
| | - Valentina Rosan
- National Research Council (CNR)—Institute of Agro-environmental and Forest Biology (IBAF), Legnaro (PD), Italy
| | - Maurizio Sattin
- National Research Council (CNR)—Institute of Agro-environmental and Forest Biology (IBAF), Legnaro (PD), Italy
- * E-mail:
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Abstract
Robust protocols to test putative herbicide resistant weed populations at whole plant level are essential to confirm the resistance status. The presented protocols, based on whole-plant bioassays performed in a greenhouse, can be readily adapted to a wide range of weed species and herbicides through appropriate variants. Seed samples from plants that survived a field herbicide treatment are collected and stored dry at low temperature until used. Germination methods differ according to weed species and seed dormancy type. Seedlings at similar growth stage are transplanted and maintained in the greenhouse under appropriate conditions until plants have reached the right growth stage for herbicide treatment. Accuracy is required to prepare the herbicide solution to avoid unverifiable mistakes. Other critical steps such as the application volume and spray speed are also evaluated. The advantages of this protocol, compared to others based on whole plant bioassays using one herbicide dose, are related to the higher reliability and the possibility of inferring the resistance level. Quicker and less expensive in vivo or in vitro diagnostic screening tests have been proposed (Petri dish bioassays, spectrophotometric tests), but they provide only qualitative information and their widespread use is hindered by the laborious set-up that some species may require. For routine resistance testing, the proposed whole plant bioassay can be applied at only one herbicide dose, so reducing the costs.
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Affiliation(s)
- Silvia Panozzo
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy
| | - Laura Scarabel
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy
| | - Alberto Collavo
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy
| | - Maurizio Sattin
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy;
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Abstract
Robust protocols to test putative herbicide resistant weed populations at whole plant level are essential to confirm the resistance status. The presented protocols, based on whole-plant bioassays performed in a greenhouse, can be readily adapted to a wide range of weed species and herbicides through appropriate variants. Seed samples from plants that survived a field herbicide treatment are collected and stored dry at low temperature until used. Germination methods differ according to weed species and seed dormancy type. Seedlings at similar growth stage are transplanted and maintained in the greenhouse under appropriate conditions until plants have reached the right growth stage for herbicide treatment. Accuracy is required to prepare the herbicide solution to avoid unverifiable mistakes. Other critical steps such as the application volume and spray speed are also evaluated. The advantages of this protocol, compared to others based on whole plant bioassays using one herbicide dose, are related to the higher reliability and the possibility of inferring the resistance level. Quicker and less expensive in vivo or in vitro diagnostic screening tests have been proposed (Petri dish bioassays, spectrophotometric tests), but they provide only qualitative information and their widespread use is hindered by the laborious set-up that some species may require. For routine resistance testing, the proposed whole plant bioassay can be applied at only one herbicide dose, so reducing the costs.
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Affiliation(s)
- Silvia Panozzo
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy
| | - Laura Scarabel
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy
| | - Alberto Collavo
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy
| | - Maurizio Sattin
- Institute of Agro-environmental and Forest Biology (IBAF), National Research Council (CNR), Italy;
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Scarabel L, Panozzo S, Varotto S, Sattin M. Allelic variation of the ACCase gene and response to ACCase-inhibiting herbicides in pinoxaden-resistant Lolium spp. Pest Manag Sci 2011; 67:932-41. [PMID: 21413142 DOI: 10.1002/ps.2133] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2010] [Revised: 10/09/2010] [Accepted: 11/16/2010] [Indexed: 05/13/2023]
Abstract
BACKGROUND The repeated use of acetyl-coenzyme A carboxylase (ACCase) inhibiting herbicides to control grass weeds has selected for resistance in Lolium spp. populations in Italy. The efficacy of pinoxaden, a recently marketed phenylpyrazoline herbicide, is of concern where resistance to ACCase inhibitors has already been ascertained. ACCase mutations associated with pinoxaden resistance were investigated, and the cross-resistance pattern to clodinafop, haloxyfop, sethoxydim, clethodim and pinoxaden was established on homo/heterozygous plants for four mutant ACCase alleles. RESULTS Seven different mutant ACCase alleles (1781-Leu, 1999-Leu, 2041-Asn, 2041-Val, 2078-Gly, 2088-Arg and 2096-Ala) and 13 combinations with two types of mutation were detected in the pinoxaden-resistant plants. The 1781-Leu allele appears to confer a dominant resistance to pinoxaden, clodinafop, haloxyfop, sethoxydim and clethodim at 60 g AI ha(-1) . The 2041-Asn and 2041-Val alleles are associated with dominant or partially dominant resistance to FOPs, no substantial resistance to DIMs and a moderate resistance to pinoxaden. The 2088-Arg allele endows a partially dominant resistance to clodinafop, sethoxydim and most likely to pinoxaden. In addition, non-target-site resistance mechanisms seem to be involved in pinoxaden resistance. CONCLUSION Almost all the ACCase mutations selected in the field by other ACCase inhibitors are likely to confer resistance to pinoxaden. Although pinoxaden is sometimes able to control FOP-resistant populations, it should not be considered as a sustainable ACCase resistance management tool. The presence of non-ACCase-based resistance mechanisms that could confer resistance to herbicides with different modes of action further complicates the resistance management strategies.
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Affiliation(s)
- Laura Scarabel
- Istituto di Biologia Agroambientale e Forestale-CNR, Agripolis, Legnaro (PD), Italy.
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Délye C, Pernin F, Scarabel L. Evolution and diversity of the mechanisms endowing resistance to herbicides inhibiting acetolactate-synthase (ALS) in corn poppy (Papaver rhoeas L.). Plant Sci 2011; 180:333-342. [PMID: 21421378 DOI: 10.1016/j.plantsci.2010.10.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 10/05/2010] [Accepted: 10/07/2010] [Indexed: 05/27/2023]
Abstract
We investigated the diversity of mechanisms conferring resistance to herbicides inhibiting acetolactate synthase (ALS) in corn poppy (Papaver rhoeas L.) and the processes underlying the selection for resistance. Six mutant ALS alleles, Arg₁₉₇, His₁₉₇, Leu₁₉₇, Ser₁₉₇, Thr₁₉₇ and Leu₅₇₄ were identified in five Italian populations. Different alleles were found in a same population or a same plant. Comparison of individual plant phenotype (herbicide sensitivity) and genotype (amino-acid substitution(s) at codon 197) showed that all mutant ALS alleles conferred dominant resistance to the field rate of the sulfonylurea tribenuron and moderate or no resistance to the field rate of the triazolopyrimidine florasulam. Depending on the allele, dominant or partially dominant resistance to the field rate of the imidazolinone imazamox was observed. Putative non-target-site resistance mechanisms were also likely present in the populations investigated. The derived Cleaved Amplified Polymorphic Sequence assays targeting ALS codons crucial for herbicide sensitivity developed in this work will facilitate the detection of resistance due to mutant ALS alleles. Nucleotide variation around codon 197 indicated that mutant ALS alleles evolved by multiple, independent appearances. Resistance to ALS inhibitors in P. rhoeas clearly evolved by redundant evolution of a set of mutant ALS alleles and likely of non-target-site mechanisms.
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Affiliation(s)
- Christophe Délye
- INRA, UMR1210 Biologie et Gestion des Adventices, 17 rue Sully, F-21000 Dijon, France.
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Scarabel L, Locascio A, Furini A, Sattin M, Varotto S. Characterisation of ALS genes in the polyploid species Schoenoplectus mucronatus and implications for resistance management. Pest Manag Sci 2010; 66:337-44. [PMID: 19921713 DOI: 10.1002/ps.1883] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Accepted: 09/03/2009] [Indexed: 05/28/2023]
Abstract
BACKGROUND The polyploid weed Schoenoplectus mucronatus (L.) Palla has evolved target-site resistance to ALS-inhibiting herbicides in Italian rice crops. Molecular and genetic characterisation of the resistance mechanism is relevant to the evolution and management of herbicide resistance. The authors aimed (a) to study the organisation of the target-site loci in two field-selected S. mucronatus populations with different cross-resistance patterns, (b) to identify the mutations endowing resistance to ALS inhibitors and determine the role of these mutations by using transgenesis and (c) to analyse the implications for the management of the S. mucronatus populations. RESULTS Two complete ALS genes (ALS1 and ALS2) having an intron and a third partial intronless ALS gene (ALS3) were identified. The presence of multiple ALS genes was confirmed by Southern blot analyses, and ALS loci were characterised by examining cytosine methylation. In S. mucronatus leaves, the transcripts of ALS1, ALS2 and ALS3 were detected. Two mutations endowing resistance (Pro(197) to His and Trp(574) to Leu) were found in both resistant populations, but at different frequencies. Tobacco plants transformed with the two resistant alleles indicated that the Pro(197)-to-His substitution conferred resistance to SU and TP herbicides, while the allele with the Trp(574)-to-Leu substitution conferred cross-resistance to SU, TP, IMI and PTB herbicides. CONCLUSION Schoenoplectus mucronatus has multiple ALS genes characterised by methylated sites that can influence the expression profile. The two mutated alleles proved to be responsible for ALS resistance. At population level, the resistance pattern depends on the frequency of various resistant genotypes, and this influences the efficacy of various ALS-inhibiting herbicides.
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Affiliation(s)
- Laura Scarabel
- Istituto di Biologia Agroambientale e Forestale-CNR, Agripolis, Legnaro (PD), Italy.
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