First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate

Dellaferrera, Ignacio; Cortés, Eduardo; Panigo, Elisa; Christoffoleti, Pedro Jacob; Perreta, Mariel Gladis

doi:10.3390/agronomy8080140

Cited by 22 publications

(31 citation statements)

References 23 publications

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“…Resistance to 2,4-D was confirmed in all the R populations studied for the six dicotyledonous weed species, both thanks to ethylene production and dose-response experiments (Figure 1 and Table 2). The RF (always ≥4) were in the range reported in previous research for A. hybridus [24], P. rhoeas [13,18,27], P. hysterophorus [25] or close relative species to H. incana such as R. raphanistrum [21]. Also, in this work, ethylene biosynthesis supported susceptibility and resistance of all populations; all R plants tested accumulated less ethylene than S plants for each species, as in previous studies [13,28].…”

Section: Discussionsupporting

confidence: 88%

“…It is expected that the number of cases will increase trough the next years due to both new uses of 2,4-D enabled by the introduction of 2,4-D R crops, and also its incremental use due to greater dependence on SAH in response to the emergence of resistance to other herbicides [23]. Among many countries, very important new weeds R to 2,4-D have been cited: Amaranthus hybridus from Argentina [24] and Parthenium hysterophorus from Cuba [25], in which enhanced metabolism seems to be involved, and Papaver rhoeas is now spreading in France and Italy [26]. Other cases have been reported but not yet investigated, including Conyza canadensis from Hungary and C. sumatrensis from France, both found in vineyards, and Hirschfeldia incana from Argentina in winter cereals, reported by the co-author Dr. Vigna [11].…”

Section: Introductionmentioning

confidence: 99%

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Resistance Mechanisms to 2,4-D in Six Different Dicotyledonous Weeds Around the World

et al. 2020

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2,4-D resistance is increasing around the world due to both transgenic crops and resistance to other herbicides. The objective of the this study was to characterize the currently unknown mechanisms of 2,4-D resistance in five weed species from around the globe: Amaranthus hybridus (Argentina), Conyza canadensis (Hungary), Conyza sumatrensis (France), Hirschfeldia incana (Argentina) and Parthenium hysterophorus (Dominican Republic), using Papaver rhoeas (Spain) as a standard resistant (R) species. Dose-response trials using malathion and absorption, translocation and metabolism experiments were performed to unravel the resistance mechanisms. R plants produced at least 3-folds less ethylene than susceptible plants, confirming the resistance to 2,4-D, together with resistance factors >4. A. hybridus, P. hysterophorus and P. rhoeas showed both reduced translocation and enhanced metabolism. In the two Conyza sps., the only resistance mechanism found was enhanced metabolism. Malathion synergized with 2,4-D in all these species, indicating the role of cytochrome P450 in the herbicide degradation. In H. incana, reduced translocation was the only contributing mechanism to resistance. Among the six dicotyledonous weed species investigated, there was a differential contribution to 2,4-D resistance of enhanced metabolism and reduced translocation. Thus, extrapolating 2,4-D resistance mechanisms from one weed species to another is very risky, if even related.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Resistance Mechanisms to 2,4-D in Six Different Dicotyledonous Weeds Around the World

et al. 2020

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“…In the case of glyphosate resistance, it is a triple mutation that confers high levels of resistance and that had not previously been observed in any other species [10,54]. In addition, in Argentina there are also populations of the species with multiple resistance to 2,4-D and dicamba [55]. Therefore, if it is confirmed that the resistant populations of A. hybridus found in Brazil were introduced from Argentina, the scenario faced by Brazilian farmers in the coming years in relation to weed management will be very difficult.…”

Section: History Of Reports Of Herbicide-resistant Weeds In Brazil Pementioning

confidence: 99%

Herbicide Resistance in Brazil: Status, Impacts, and Future Challenges

Cruz¹,

Oliveira²,

Carvalho³

et al. 2020

Pests, Weeds and Diseases in Agricultural Crop and Animal Husbandry Production

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Brazil is a large producer and exporter of crops in global terms. Weeds may be responsible for ~14% of crop losses, depending on the crop system. Herbicides occupy 58% of the Brazilian pesticide market; however, the continuous use of these products and the high selection pressure have led to the emergence of weeds resistant to herbicides. Today, there are 51 weed species reported as being resistant to herbicides in Brazil, of which 17 involves cross and multiple-resistance. Acetolactate synthase (ALS), acetyl coenzyme A carboxylase (ACCase) and 5-enolpiruvylshikimate-3-phosphate synthase (EPSPs) inhibitors are the herbicidal groups with the most resistance cases. Soybean, corn, rice, wheat and cotton present 30, 12, 10, 9 and 8 cases, respectively, occurring mainly in herbicide-resistant crop fields from the Southern and Central West regions of the country. To better understand the dimensions of herbicide resistance, in this chapter, we will explore the size of agricultural activity in Brazil, the pesticide market and the use of herbicides in the main crops. In addition, the agronomic, scientific-technical and economic aspects that have contributed, directly or indirectly, to the selection of resistant weeds will be discussed in order to have an overview of the economic impact of herbicide resistance management.

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“…Amaranthus species are prone to evolve resistance after repeated exposure to herbicides having the same site of action (SoA). To date, monoecious Amaranthus species have evolved multiple resistance to two different SoAs, A. hybridus to ALS and PSII inhibitors (HRAC group C1), to ALS and EPSPS inhibitors, and recently to EPSPS inhibitors and synthetic auxins . A. retroflexus evolved multiple resistance to two classes of PSII (HRAC group C1 and C2), to ALS and PSII inhibitors, whereas another biotype proved to be resistant to ALS and PPO inhibitors .…”

Section: Introductionmentioning

confidence: 99%

“…To date, monoecious Amaranthus species have evolved multiple resistance to two different SoAs, 6 A. hybridus to ALS and PSII inhibitors (HRAC group C1), 7 to ALS and EPSPS inhibitors, 8 and recently to EPSPS inhibitors and synthetic auxins. 9 A. retroflexus evolved multiple resistance to two classes of PSII (HRAC group C1 and C2), 10 to ALS and PSII inhibitors, 11 whereas another biotype proved to be resistant to ALS and PPO inhibitors. 12 Dioecious species evolved a number of complex two-and three-way multiple resistance 6 with A. tuberculatus that became multiple resistant to up to six SoA (ALS, PSII, EPSPS, PPO, HPPD inhibitors and synthetic auxins).…”

Section: Introductionmentioning

confidence: 99%

A family affair: resistance mechanism and alternative control of three Amaranthus species resistant to acetolactate synthase inhibitors in Italy

Milani

Scarabel

Sattin

2019

Pest Management Science

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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 Asp376Glu 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 Trp574Met, 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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First Report of Amaranthus hybridus with Multiple Resistance to 2,4-D, Dicamba, and Glyphosate

Cited by 22 publications

References 23 publications

Resistance Mechanisms to 2,4-D in Six Different Dicotyledonous Weeds Around the World

Resistance Mechanisms to 2,4-D in Six Different Dicotyledonous Weeds Around the World

Herbicide Resistance in Brazil: Status, Impacts, and Future Challenges

A family affair: resistance mechanism and alternative control of three Amaranthus species resistant to acetolactate synthase inhibitors in Italy

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