Multiple resistance to glyphosate, paraquat and ACCase‐inhibiting herbicides in Italian ryegrass populations from California: confirmation and mechanisms of resistance

Tehranchian, Parsa; Nandula, Vijay K.; Jugulam, Mithila; Putta, Karthik; Jasieniuk, Marie

doi:10.1002/ps.4774

Cited by 25 publications

(36 citation statements)

References 41 publications

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“…It is common knowledge that nature and location of one or more mutations in the gene encoding for an herbicidal target site determine the cross‐resistance profiles of herbicides belonging to different chemical classes but with the same mode of action, as realized with ALS inhibitors, ACCase inhibitors, and other herbicide modes of action. The I1781L mutation conferred resistance to sethoxydim and cross‐resistance to clethodim, fluazifop, fenoxaprop, and cyhalofop in Italian ryegrass from California . Further, Italian ryegrass plants homozygous for mutant alleles at the 1781 loci were resistant to several ‘fop’ and ‘dim’ herbicides, and pinoxaden .…”

Section: Discussionsupporting

confidence: 91%

“…The NC22 biotype was cross‐resistant to at least one ACCase inhibitor from each of the ‘dims’, ‘fops’, and ‘den’ families. Similar cases of Italian ryegrass cross‐resistance to ACCase inhibitors were documented in Idaho and California . In Idaho, 12% of populations tested had cross‐resistance to several ACCase inhibitors including sethoxydim, clethodim, quizalofop, and pinoxaden .…”

Section: Discussionmentioning

confidence: 59%

“…In Idaho, 12% of populations tested had cross‐resistance to several ACCase inhibitors including sethoxydim, clethodim, quizalofop, and pinoxaden . Two Italian ryegrass populations from California that had multiple resistance sethoxydim, paraquat and glyphosate, were cross‐resistant to fluazifop, fenoxaprop, and cyhalofop, with one population also resistant to clethodim displaying only a 14% reduction in above‐ground biomass dry weight . While cross‐resistance studies were not conducted on any of the Mississippi resistant biotypes, expected results from treatment with other ACCase inhibitors may be assessed from the nature of mutations discovered from the sequencing studies described below.…”

Section: Discussionmentioning

confidence: 99%

“…Some of the mutations discovered in the Mississippi and North Carolina biotypes have been reported previously in Italian ryegrass. Tehranchian et al (2017) documented presence of an I1781L in two resistant biotypes from California . In an ACCase inhibitor‐resistant Italian ryegrass population from Oregon, two mutations, I2041N and D2078G, were found .…”

Section: Discussionmentioning

confidence: 99%

“…Similar cases of Italian ryegrass cross-resistance to ACCase inhibitors were documented in Idaho and California. 27,28 In Idaho, 12% of populations tested had cross-resistance to several ACCase inhibitors including sethoxydim, clethodim, quizalofop, and pinoxaden. 27 Two Italian ryegrass populations from California that had multiple resistance sethoxydim, paraquat and glyphosate, were cross-resistant to fluazifop, fenoxaprop, and cyhalofop, with one population also resistant to clethodim displaying only a 14% reduction in above-ground biomass dry weight.…”

Section: Discussionmentioning

confidence: 99%

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Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Nandula

Giacomini

Lawrence

et al. 2019

Pest Management Science

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BACKGROUND Clethodim, an acetyl‐CoA carboxylase (ACCase)‐inhibiting herbicide, is one of the few postemergence chemical control options available to growers of Mississippi to manage glyphosate and/or other herbicide resistant Italian ryegrass populations. Recently, clethodim failed to adequately control Italian ryegrass populations across Mississippi. A sethoxydim, also an ACCase inhibitor, ‐resistant Italian ryegrass population from North Carolina was cross‐resistant to clethodim. This research characterized the magnitude and mechanisms of clethodim resistance in the Mississippi and North Carolina Italian ryegrass populations via whole‐plant herbicide dose response, cross resistance, and metabolism studies, and molecular analysis. RESULTS Two clethodim‐resistant biotypes from Mississippi, MS24 and MS37, were 10‐ and 4‐fold resistant, respectively, relative to a susceptible (SUS1) biotype. A North Carolina biotype, NC21, was 40‐fold resistant to clethodim compared to SUS1. Two additional biotypes from North Carolina, NC22 and NC 23, recorded shoot dry weight reduction of only 17–30% of nontreated at the highest clethodim dose of 2.17 kg ha−1, (8×). The NC22 biotype was cross‐resistant to sethoxydim, fluazifop, quizalofop, and pinoxaden. Metabolic inhibitors such as piperonyl butoxide and 4‐chloro‐7‐nitrobenzofurazan did not affect resistance of MS37, MS51, and NC22 biotypes to fenoxaprop, clethodim, or pinoxaden. The MS37 biotype had three target site mutations, I2041N, C2088R, and G2096A. Another clethodim‐resistant biotype from Mississippi, MS51, had only the C2088R substitution. The NC22 and NC23 biotypes had I1781L, I2041N, and D2078G replacements. CONCLUSION This study shows that the mechanism of resistance to clethodim in Italian ryegrass from Mississippi and North Carolina is due to target site modifications in the ACCase gene leading to broad cross‐resistance to other ACCase‐inhibiting herbicides. Published 2019. This article is a U.S. Government work and is in the public domain in the USA.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Nandula

Giacomini

Lawrence

et al. 2019

Pest Management Science

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Plant Cell Technology

2021

Advanced Fermentation and Cell Technology

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Hierarchical cluster analysis of herbicide modes of action reveals distinct classes of multiple resistance in weeds

Hulme

2021

Pest Management Science

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BACKGROUND: The number of weed species resistant to multiple herbicide modes of action (MoAs) has increased over the last 30 years and may in the future render existing herbicide MoAs obsolete for many cropping systems. Yet few predictive tools exist to manage this risk. Using a worldwide dataset of weed species resistant to multiple herbicide MoAs, hierarchical clustering was used to classify MoAs into similar groups in relation to the suite of resistant weed species they have in common. Network analyses then were used to explore the relative importance of species prevalence and similarity in cluster patterns.RESULTS: Hierarchical clustering identified three similarly sized clusters of herbicide MoAs that were linked by the co-occurrence of resistant weeds: Herbicide Resistance Action Committee (HRAC) groups 2, 4, 5 and 9; HRAC groups 12, 14 and 15; and HRAC groups 1, 3 and 22. Cluster membership was consistent with similarities in the physiological or biochemical target of the herbicide MoAs. Network analyses revealed that the number of weed species resistant to two different MoAs was related to the number of weeds known to be resistant to each individual herbicide MoA. CONCLUSIONS: Hierarchical cluster analysis provided new insights into the risk of weeds becoming resistant to more than one herbicide MoA. By clustering herbicide MoAs into three distinct groups, the potential exists for farmers to manage resistance by rotating herbicides between rather than within clusters, as far as crop, weed and environmental conditions allow.

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Multiple resistance to glyphosate, paraquat and ACCase‐inhibiting herbicides in Italian ryegrass populations from California: confirmation and mechanisms of resistance

Abstract: This study shows that multiple herbicide resistance in Italian ryegrass populations in California, USA, is due to both target-site and non-target-site resistance mechanisms. © 2017 Society of Chemical Industry.

Cited by 25 publications

References 41 publications

Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Resistance to clethodim in Italian ryegrass (Lolium perenne ssp. multiflorum) from Mississippi and North Carolina

Plant Cell Technology

Hierarchical cluster analysis of herbicide modes of action reveals distinct classes of multiple resistance in weeds

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