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A family affair: resistance mechanism and alternative control of three Amaranthus species resistant to acetolactate synthase inhibitors in Italy
- Source :
- Pest management science (Online) (2019). doi:10.1002/ps.5667, info:cnr-pdr/source/autori:Milani A., Scarabel L., Sattin M./titolo:A family affair: resistance mechanism and alternative control of three Amaranthus species resistant to acetolactate synthase inhibitors in Italy/doi:10.1002%2Fps.5667/rivista:Pest management science (Online)/anno:2019/pagina_da:/pagina_a:/intervallo_pagine:/volume
- Publication Year :
- 2019
-
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.
- Subjects :
- 0106 biological sciences
Amaranthus hybridus
01 natural sciences
chemistry.chemical_compound
Metribuzin
Molecular marker
Botany
Acetolactate synthase
Amaranthus
biology
Herbicides
Bentazon
General Medicine
biology.organism_classification
010602 entomology
Acetolactate Synthase
chemistry
Italy
Insect Science
Glyphosate
Acetolactate-synthase resistance
waterhemp
smooth pigweed
redroot pigweed
point mutations
sympatry
Amaranthus tuberculatus
biology.protein
Lactates
Weed
Agronomy and Crop Science
010606 plant biology & botany
Herbicide Resistance
Subjects
Details
- ISSN :
- 15264998
- Volume :
- 76
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Pest management scienceREFERENCES
- Accession number :
- edsair.doi.dedup.....f75dd96d934049ccd005ebca4a8a3996