Current status in herbicide resistance in Lolium rigidum in winter cereal fields in Spain: Evolution of resistance 12 years after

Loureiro, Íñigo; Escorial, Concepción; Plaza, Eva Hernández; Andújar, José Luis González; Chueca, María Cristina

doi:10.1016/j.cropro.2017.08.001

Cited by 19 publications

(20 citation statements)

References 25 publications

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“…Failures in the control of L. rigidum with chlorsulfuron (ALS inhibiting herbicide) were subsequently reported in the river Duero region in Castilla-León ( de la Carrera et al, 1999 ). ACCase, ALS, and PSII inhibitors resistance is now widespread throughout the Spanish winter cereal cropping system ( Loureiro et al, 2017 ), with 75% of L. rigidum populations in Catalonia exhibiting HR to these SoA ( Loureiro et al, 2010 , 2017 ). The resistance problem is becoming even more complex, with HR reported toward other graminicides used in canola, including clethodim and fluazifop-butyl ( Cirujeda and Taberner, 2003 ).…”

Section: Introductionmentioning

confidence: 99%

Target-Site and Non-target-Site Resistance Mechanisms Confer Multiple and Cross- Resistance to ALS and ACCase Inhibiting Herbicides in Lolium rigidum From Spain

et al. 2021

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Lolium rigidum is one the worst herbicide resistant (HR) weeds worldwide due to its proneness to evolve multiple and cross resistance to several sites of action (SoA). In winter cereals crops in Spain, resistance to acetolactate synthase (ALS)- and acetyl-CoA carboxylase (ACCase)-inhibiting herbicides has become widespread, with farmers having to rely on pre-emergence herbicides over the last two decades to maintain weed control. Recently, lack of control with very long-chain fatty acid synthesis (VLCFAS)-inhibiting herbicides has been reported in HR populations that are difficult to manage by chemical means. In this study, three Spanish populations of L. rigidum from winter cereals were confirmed as being resistant to ALS- and ACCase-inhibiting herbicides, with broad-ranging resistance toward the different chemistries tested. In addition, reduced sensitivity to photosystem II-, VLCFAS-, and phytoene desaturase-inhibiting herbicides were confirmed across the three populations. Resistance to ACCase-inhibiting herbicides was associated with point mutations in positions Trp-2027 and Asp-2078 of the enzyme conferring target site resistance (TSR), while none were detected in the ALS enzyme. Additionally, HR populations contained enhanced amounts of an ortholog of the glutathione transferase phi (F) class 1 (GSTF1) protein, a functional biomarker of non-target-site resistance (NTSR), as confirmed by enzyme-linked immunosorbent assays. Further evidence of NTSR was obtained in dose-response experiments with prosulfocarb applied post-emergence, following pre-treatment with the cytochrome P450 monooxygenase inhibitor malathion, which partially reversed resistance. This study confirms the evolution of multiple and cross resistance to ALS- and ACCase inhibiting herbicides in L. rigidum from Spain by mechanisms consistent with the presence of both TSR and NTSR. Moreover, the results suggest that NTSR, probably by means of enhanced metabolism involving more than one detoxifying enzyme family, confers cross resistance to other SoA. The study further demonstrates the urgent need to monitor and prevent the further evolution of herbicide resistance in L. rigidum in Mediterranean areas.

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Section: Introductionmentioning

confidence: 99%

Target-Site and Non-target-Site Resistance Mechanisms Confer Multiple and Cross- Resistance to ALS and ACCase Inhibiting Herbicides in Lolium rigidum From Spain

et al. 2021

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“…638 Escorial et al: Glyphosate sensitivity values should be only compared when the experiments have been carried out under similar conditions of plant growth (temperature, relative humidity, and light intensity), phenological stage of the plants, herbicide products used, or the timing of evaluation of the experiment. Herbicide resistance is increasing worldwide, with an increasing number of cases of cross-and multiple resistance (Hicks et al 2018;Loureiro et al 2017;Peterson et al 2018;Powles 2014), thereby limiting the number of available herbicide options for weed control for farmers. Glyphosate resistance is not an exception.…”

Section: Resultsmentioning

confidence: 99%

“…Husnot.] in the United Kingdom (Hicks et al 2018;Hull et al 2014) and ripgut brome (Bromus diandrus Roth) (Escorial et al 2011) or rigid ryegrass (Lolium rigidum Gaudin) in Spain (Loureiro et al 2017). Accordingly, farmers are now compelled to use other strategies for weed control before sowing the crop, such as false seedbeds and delayed sowing to promote the early emergence of weed (van der Weide and Bleeker 1998), commonly followed by glyphosate application.…”

Section: Introductionmentioning

confidence: 99%

Glyphosate sensitivity of selected weed species commonly found in maize fields

et al. 2019

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Glyphosate resistance has evolved worldwide. Glyphosate is also the most used herbicide in Spain, and current changes in herbicide usage patterns can increase the risk of glyphosate resistance development. The objective of this study was to assess the glyphosate sensitivity of different selected weed species important in Spanish maize (Zea mays L.) fields. To this end, dose–response experiments were conducted under controlled conditions in a growth chamber to examine variation in glyphosate sensitivity among populations of five grass weed species and eight broadleaf weed species that are commonly found in the maize fields in Castilla y León, the biggest maize-growing region in Spain. The glyphosate doses that caused growth reduction by 50% (GR50) were calculated for each weed population. No populations were resistant to glyphosate. In addition, baseline values of glyphosate sensitivity were determined for each weed species. The GR50 baseline values ranged from 10.25 to 53.23 g ai ha−1 for the dicotyledonous weed species and from 16.05 to 66.34 g ai ha−1 for the monocotyledonous weed species. The ratio between the GR50 values of the least and most sensitive populations was used to determine the SI50 (sensitivity index at 50% growth reduction) for each weed species. The SI50 values showed a 1.4- to 3.3-fold difference in sensitivity for dicotyledonous weed species and 1.4- to 2.4-fold difference for monocotyledonous weed species. The sensitivity index was also calculated as the ratio between the GR50 values of the least sensitive population and the baseline GR50 value estimated for a range of susceptible populations (SI50b). SI50b values showed a 1.2- to 1.6-fold difference in sensitivity for dicotyledonous weed species and 1.1- to 1.2-fold difference for monocotyledonous weed species. The sensitivity data generated in this study provide a reference for determining time-dependent changes in glyphosate sensitivity in the commonly found weeds in the maize fields of Castilla y Léon.

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“…Resistance in rigid ryegrass is one of the most economically important examples of herbicide resistance in world agriculture. The mechanisms of resistance in rigid ryegrass have been demonstrated to be i) target site mutations within ACCase (acetyl coenzyme A carboxylase) and ALS (acetolactate synthase) and ii) enhanced herbicide metabolism of ACCase-, ALS-, and PS II-inhibiting herbicides (Délye, 2005;Scarabel et al, 2011;Malone et al, 2014;Yu & Powles, 2014;Saini et al, 2015;Han et al, 2016;Loureiro et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effective Preemergence Herbicides for Rigid Ryegrass (Lolium rigidum Gaud.) Control in Irrigated Bread Wheat (Triticum aestivum L.)

Tanji¹,

Boutfirass²

2018

JAS

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Three on-farm weed control experiments were conducted in irrigated bread wheat in the Doukkala perimeter, Morocco, in 2015-16 and 2016-17 in order to study the efficacy of 4 pre-emergence herbicide treatments for controlling rigid ryegrass that is resistant to 13 post-emergence herbicides. Results showed that 3 pre-emergence herbicides [i) chlorotoluron, 2000 g/ha + isoxaben, 74.8 g/ha; ii) prosulfocarb, 4000 g/ha; iii) prosulfocarb, 2000 g/ha + s-metolachlor, 300 g/ha] reduced rigid ryegrass shoot biomass by > 90% 1 to 3 months after treatments (MAT). Pendimethalin (1320 g ha-1) achieved 83-99% rigid ryegrass control 1 to 3 MAT. The four herbicide treatments were safe on wheat in one experiment, but reduced wheat density in 2 other experiments due to heavy rain (about 100 mm) after herbicide treatments and before crop emergence. Grain yields in sprayed plots ranged from 6.6 to 9.8 t ha-1, 4.4 to 7.4 t ha-1, 7.3 to 8.9 t ha-1 in experiments 1 to 3, respectively. Straw yields were 11.4 to 15.4, 9.6 to 15.8, and 10.1 to 14.5 t ha-1 in the 3 experiments, respectively. These preemergence herbicides need to be used by wheat growers as part of an integrated weed management program. Further research is needed to explore ways to avoid wheat injury, that could be occasionally caused by heavy rain or irrigation, after preemergence herbicide application and before crop emergence.

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Current status in herbicide resistance in Lolium rigidum in winter cereal fields in Spain: Evolution of resistance 12 years after

Cited by 19 publications

References 25 publications

Target-Site and Non-target-Site Resistance Mechanisms Confer Multiple and Cross- Resistance to ALS and ACCase Inhibiting Herbicides in Lolium rigidum From Spain

Target-Site and Non-target-Site Resistance Mechanisms Confer Multiple and Cross- Resistance to ALS and ACCase Inhibiting Herbicides in Lolium rigidum From Spain

Glyphosate sensitivity of selected weed species commonly found in maize fields

Effective Preemergence Herbicides for Rigid Ryegrass (Lolium rigidum Gaud.) Control in Irrigated Bread Wheat (Triticum aestivum L.)

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