Distribution and analysis of the mechanisms of resistance of barnyardgrass (<i>Echinochloa crus-galli</i>) to imidazolinone and quinclorac herbicides

Matzenbacher, F.O.; Bortoly, E. D.; Kalsing, Augusto; Merotto, Aldo

doi:10.1017/s0021859614000768

Cited by 48 publications

(60 citation statements)

References 38 publications

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“…In Brazil, imidazolinones and/ or quinclorac resistant Echinochloa populations are widespread over flooded rice fields in the southern region of the country (MATZENBACHER et al, 2015). This problem requires a changing attitude from rice farmers and technicians, not only on alternative herbicide usage, but also on attention towards good practices for the use of these products.…”

Section: Discussionmentioning

confidence: 99%

“…In the phenology trial, the five populations evaluated were from the specie E. crus-galli and differences were observed among them in the response to increased herbicide rates (Table 1). This may be related to populations' adaptations in metabolizing cyhalofop-butyl at higher level and/or speed velocity (RUIZ-SANTAELLA et al, 2006b;MATZENBACHER et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Among the available herbicide options for this situation, cyhalofop-butyl stands out, since its action mechanism is different from imidazolinones (MATZENBACHER et al, 2015). However, in some cases, rice farmers are not satisfied with cyhalofopbutyl results, mainly when Echinochloa plants emerge at different times and are in variable growth stages at the application.…”

Section: Resumo: Cyhalofop-butyl Destaca-se Dentre Os Herbicidas Usadmentioning

confidence: 99%

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Susceptibility of Echinochloa populations to cyhalofop-butyl in Southern region of Brazil and impact of the weed phenology on its efficacy of control

Kalsing¹,

Tronquini²,

Mariot³

et al. 2017

Cienc. Rural

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Cyhalofop-butyl stands out among the herbicides in the control of imidazolinone-resistant Echinochloa species; but, rice farmers are not always satisfied with the control achieved with this herbicide. The objectives were to evaluate in regional scale the susceptibility of Echinochloa populations to cyhalofop-butyl, and quantify the effect of the weed phenology on its efficacy of control. For this, three trials were carried out under greenhouse conditions with a fully random design, using Echinochloa populations collected in rice fields in the southern region of Brazil. In two trials, the susceptibility level of 156 (2012/13 growth season) and 103 (2013/14 growth season) populations were evaluated with the application of cyhalofop-butyl at 360g ha-1. In other trial, in which treatments were arranged in a bi-factorial design (A = 6 x B = 5), it was evaluated six cyhalofop-butyl rates and five phenological stages of E. crus-galli populations. Echinochloa populations had showed differential susceptibility to cyhalofop-butyl, especially in the 2013/14 growth season, where 20 out of the 103 populations had control lower than 90%. The efficacy of this herbicide was inversely proportional to the phenological stage, and the application timing delay contributed directly to the decrease of susceptibility to the herbicide. Cyhalofop-butyl is an effective alternative to control imidazolinone-resistant Echinochloa populations, as long as the application timing occurs in the early phenological stages (2 to 4 leaves).

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Resumo: Cyhalofop-butyl Destaca-se Dentre Os Herbicidas Usadmentioning

confidence: 99%

See 1 more Smart Citation

Susceptibility of Echinochloa populations to cyhalofop-butyl in Southern region of Brazil and impact of the weed phenology on its efficacy of control

Kalsing¹,

Tronquini²,

Mariot³

et al. 2017

Cienc. Rural

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“…The availability of imidazolinone-resistant rice cultivars (Clearfield® rice) have allowed the repetitive use of these herbicides, selecting resistant barnyardgrass populations. In southern Brazil, the mechanism of resistance of these populations involves both types: mutations in the ALS enconding gene and increased metabolism by detoxifying enzymes (Matzenbacher, Bortoly, Kalsing, & Merotto Jr., 2015). In this study the effect of degradation enhancement as the mechanim of resistance was inferred through P450 inhibitors.…”

Section: Introductionmentioning

confidence: 91%

Differential Expression of Genes Associated With Degradation Enhancement of Imazethapyr in Barnyardgrass (Echinochloa crus-galli)

Dalazen¹,

Markus²,

Merotto³

2018

JAS

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The understanding of mechanism of herbicide resistance in weeds is essential for adequate or innovative weed management practices. The aim of this study was to identify and analyze the expression of genes related to degradation enhancement of imazethapyr in barnyardgrass (Echinochloa crus-galli L. Beauv.). One susceptible (SUSSP01) and two populations previouslly identified as resistant to imazethapyr (ARRGR01 and PALMS01) were used. Gene expression of CYP and GST, the translation initiating factor eIF4B, and ALS genes were evaluated after imazethapyr spraying. A reference gene stability analysis was carried out, wherein the genes 18S and actin showed to be more stable in response to the population and herbicide treatment. The gene expression analysis was performed by qRT-PCR. There was no difference in the relative expression of the ALS gene. The CYP81A6 and GSTF1 genes showed higher relative expression in the resistant populations. The CYP81A6 gene had expression 9.61 and 8.44 higher in the resistant populations ARRGR01 and PALMS01, respectively, in comparison with the untreated susceptible population. The expression of this gene was induced by spraying the herbicide imazethapyr. The GSTF1 gene showed higher relative expression in PALMS01 population, reaching 12.30 times higher in plants treated with imazethapyr in relation to untreated susceptible population. The expression of eIF4B gene in the resistant populations treated with imazethapyr was about six times higher than observed in susceptible population. The high relative expression of CYP81A6 and GSTF1 genes indicate the importance of degradation enhancement for the resistance of barnyargrass to imazethapyr.

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“…Matzenbacher et al (2015) evaluated 624 populations of E. crus-galli in southern Brazil and found frequency of plants with resistance to imidazolinones of 0.81, and to quinclorac of 0.19. These authors also reported that barnyardgrass resistance is due to its multiple resistance mechanisms and multiple mutations in the ALS enzyme gene, however, Barnyardgrass with multiple resistance to synthetic auxin, ALS ...…”

Section: Resultsmentioning

confidence: 99%

Barnyardgrass with Multiple Resistance to Synthetic Auxin, ALS and Accase Inhibitors

et al. 2016

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-The objective of this research was to confirm the resistance of a barnyardgrass biotype (Echinochloa crus-galli) to herbicides quinclorac (synthetic auxin), penoxsulam (ALS inhibitor) and cyhalofop-butyl (ACCase inhibitor). Two experiments were carried out in a greenhouse located in Itajaí, State of Santa Catarina, Brazil. One experiment evaluating the biotype ECH 18 (known as susceptible) and one with the ECH 141 biotype (suspected to be multiple resistant). The experimental design used was completely randomized, in a 4 x 7 factorial arrangement with four replications. The first factor was the herbicide: cyhalofopbutyl (Clincher ® ), penoxsulam (Ricer ® ), quinclorac (Facet ® ) and propanil (Grassaid ® ) and the second factor consisting of seven rates of each herbicide (0.00; 0.25; 0.50; 1; 2; 4 and 8 times the label rate). The evaluations of percentage of control, plant density per pot and dry mass of shoots were performed 35 days after treatments. The rates to control 50% and 80% and the dose to provide 50% and 80% of the weed biomass accumulation and the resistance factor were estimated based on data analysis. The initial hypothesis was confirmed; the biotype ECH 141 presented multiple resistance (synthetic auxin, ALS and ACCase inhibitor). However, the herbicide propanil controlled biotype ECH 141 adequate.Keywords: Paddy rice, Echinochloa crus-galli, chemical control, herbicide resistance. (0,00, 0,25, 0,50, 1,00, 2,00, 4,00 RESUMO -Este estudo teve como objetivo confirmar a resistência múltipla de um biótipo de capimarroz (Echinochloa crus-galli) aos herbicidas auxínicos (quinclorac), inibidores da ALS (penoxsulam) e ACCase (cyhalofop-butyl). Foram conduzidos dois experimentos em casa de vegetação localizada no município de Itajaí/SC: um com o biótipo ECH 18 (sabidamente suscetível) e outro com o biótipo ECH 141 (com suspeita de resistência múltipla). O delineamento experimental utilizado foi o inteiramente casualizado (DIC), organizado em arranjo fatorial 4 x 7, com quatro repetições. O primeiro fator avaliado foram os herbicidas: cyhalofop-butyl, penoxsulam, quinclorac e propanil (Clincher ® , Ricer ® , Facet ® e Grassaid ® , respectivamente). O segundo fator consistiu de sete doses de cada herbicida

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Distribution and analysis of the mechanisms of resistance of barnyardgrass (Echinochloa crus-galli) to imidazolinone and quinclorac herbicides

Cited by 48 publications

References 38 publications

Susceptibility of Echinochloa populations to cyhalofop-butyl in Southern region of Brazil and impact of the weed phenology on its efficacy of control

Susceptibility of Echinochloa populations to cyhalofop-butyl in Southern region of Brazil and impact of the weed phenology on its efficacy of control

Differential Expression of Genes Associated With Degradation Enhancement of Imazethapyr in Barnyardgrass (Echinochloa crus-galli)

Barnyardgrass with Multiple Resistance to Synthetic Auxin, ALS and Accase Inhibitors

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