Alleles Contributing to ACCase-Resistance in an Italian Ryegrass (<i>Lolium perenne</i>ssp.<i>multiflorum</i>) Population from Oregon

Martins, Bianca Assis Barbosa; Sanchez-Olguin, Elena; Perez‐Jones, Alejandro; Hulting, Andrew Gerald; Mallory‐Smith, Carol

doi:10.1614/ws-d-13-00169.1

Cited by 22 publications

(23 citation statements)

References 30 publications

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“…Further studies are needed to verify this, since the same population could harbor individuals with different point mutations conferring resistance to ACCase herbicides from different groups, or individual plants could carry two different mutant sites that endow resistance to more than one ACCase herbicide group. Also, populations from different geographical areas could harbor different mutations (Yu et al, 2007;Liu et al, 2007;Cruz-Hipolito et al, 2011;Délye et al, 2010;Gherekhloo et al, 2012;Marshall et al, 2013;Li et al, 2013Li et al, , 2014Malone et al, 2014;Martins et al, 2014). In addition, the level of resistance depends on the number of resistant alleles in individual plants (Cha et al, 2014;Martins et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…Also, populations from different geographical areas could harbor different mutations (Yu et al, 2007;Liu et al, 2007;Cruz-Hipolito et al, 2011;Délye et al, 2010;Gherekhloo et al, 2012;Marshall et al, 2013;Li et al, 2013Li et al, , 2014Malone et al, 2014;Martins et al, 2014). In addition, the level of resistance depends on the number of resistant alleles in individual plants (Cha et al, 2014;Martins et al, 2014). Cha et al (2014) have demonstrated that an E. indica biotype containing homozygous 2027-Cys allele could endow a higher level of resistance to fluazifop-P-butyl than a mix (heterozygous) Trp-and Cys-2027 allele biotype.…”

Section: Resultsmentioning

confidence: 99%

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Molecular Basis for Resistance to Fluazifop-P-Butyl in Itchgrass (Rottboellia cochinchinensis) from Costa Rica

Castillo-Matamoros¹,

Brenes-Angulo²,

Murillo

et al. 2016

Planta daninha

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Rottboellia cochinchinensis is an annual grass weed species known as itchgrass, or "caminadora" in America´s Spanish speaking countries, and has become a major and troublesome weed in several crops. The application of fluazifop-P-butyl at recommended rates (125 g a.i. ha-1) was observed to be failing to control itchgrass in a field in San José, Upala county, Alajuela province, Costa Rica. Plants from the putative resistant R. cochinchinensis population survived fluazifop-P-butyl when treated with 250 g a.i. ha-1 (2X label rate) at the three- to four-leaf stage under greenhouse conditions. PCR amplification and sequencing of partial carboxyl transferase domain (CT) of the acetyl-CoA carboxylase (ACCase) gene were used to determine the molecular mechanism of resistance. A single non-synonymous point mutation from TGG (susceptible plants) to TGC (putative resistant plants) that leads to a Trp-2027-Cys substitution was found. This Trp-2027-Cys mutation is known to confer resistance to all aryloxyphenoxyproprionate (APP) herbicides to which fluazifop-P-butyl belongs. To the best of our knowledge, this is the first report of fluazifop-P-butyl resistance and a mutation at position 2027 for a Costa Rican R. cochinchinensis population.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Molecular Basis for Resistance to Fluazifop-P-Butyl in Itchgrass (Rottboellia cochinchinensis) from Costa Rica

Castillo-Matamoros¹,

Brenes-Angulo²,

Murillo

et al. 2016

Planta daninha

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“…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 . A population from the UK, RG3, had a C2088R mutation …”

Section: Discussionmentioning

confidence: 99%

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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“…Aryloxyphenoxypropionate (APP) and cyclohexanedione (CHD) herbicides are potent inhibitors of acetyl coenzyme A carboxylase (ACCase; EC 6.4.1.2) and are commonly used for the control of various grass weeds. Resistance to ACCase‐inhibiting herbicides in most cases has been attributed to insensitivity of the target enzyme . However, metabolism‐based resistance to ACCase inhibitors has been identified in a comparatively small number of weed species .…”

Section: Introductionmentioning

confidence: 99%

Inheritance of evolved clethodim resistance in Lolium rigidum populations from Australia

Saini

Malone

Gill

et al. 2017

Pest Management Science

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Alleles Contributing to ACCase-Resistance in an Italian Ryegrass (Lolium perennessp.multiflorum) Population from Oregon

Cited by 22 publications

References 30 publications

Molecular Basis for Resistance to Fluazifop-P-Butyl in Itchgrass (Rottboellia cochinchinensis) from Costa Rica

Molecular Basis for Resistance to Fluazifop-P-Butyl in Itchgrass (Rottboellia cochinchinensis) from Costa Rica

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

Inheritance of evolved clethodim resistance in Lolium rigidum populations from Australia

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