From tolerance to resistance: mechanisms governing the differential response to glyphosate in <i>Chloris barbata</i>

Bracamonte, Enzo; Silveira, Hellen Martins da; Cruz, Ricardo Alcántara‐de la; Domínguez-Valenzuela, José Alfredo; Cruz-Hipólito, Hugo; Prado, Rafael De

doi:10.1002/ps.4874

Cited by 31 publications

(36 citation statements)

References 43 publications

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“…Differential accumulation of shikimic acid between R and S plants may occurs when glyphosate does not inhibit the EPSPS enzyme mechanisms [13,26,27], due to either target site or non-target site resistance mechanisms [28]. Glyphosate resistant C. canadensis plants could accumulate more shikimic acid; however, larger amounts of herbicide would be needed, i.e., an increase in glyphosate doses.…”

Section: Shikimic Acid Accumulationmentioning

confidence: 99%

First Case of Conyza canadensis from Hungary with Multiple Resistance to Glyphosate and Flazasulfuron

et al. 2018

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Conyza canadensis is a species invading large areas throughout the world, mainly due to its ability to evolve herbicide resistance. In Hungary, extensive areas have been infested by this species due to the difficulty in controlling it with glyphosate. To determine whether poor control was a result of misapplication or glyphosate resistance, eight suspected glyphosate-resistant C. canadensis populations from different Hungarian regions were studied. In whole-plant dose-response assays with glyphosate, the LD50 and GR50 values (survival and fresh weight reduction at 50% relative to the untreated control, respectively) indicated that resistance was confirmed in five of the eight populations (H-5 population being the most resistant). Additionally, the shikimic acid accumulation tests corroborated the results observed in the dose–response assays. 11 alternative herbicides from six different modes of action (MOA) were applied at field doses as control alternatives on populations H-5 and H-6 (both in the same regions). The H-5 population showed an unexpected resistance to flazasulfuron (ALS-inhibitor). The ALS enzyme activity studies indicated that the I50 for H-5 with flazasulfuron was 63.3 times higher compared to its correspondent susceptible population (H-6). Therefore, the H-5 population exhibited multiple-resistance to flazasulfuron and glyphosate, being the first case reported in Europe for these two MOA.

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Section: Shikimic Acid Accumulationmentioning

confidence: 99%

First Case of Conyza canadensis from Hungary with Multiple Resistance to Glyphosate and Flazasulfuron

et al. 2018

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“…In addition, the genus Chloris species is the main focus of many farms, since it is naturally tolerant of glyphosate herbicide [8][9][10][11]. Authors, such as Nunes et al [7] and Moraes de Aguiar et al [8], report concerns about the presence of C. distichophylla and its ability to spread to other crops where they survive from glyphosate herbicide applications.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, 48 species of glyphosate-resistant weeds have been confirmed [21], of which four belong to the genus Chloris. Most glyphosate-resistant Chloris species have been detected in Australia [22,23], Brazil [24,25], Cuba and the Dominican Republic [10], and Mexico [11].…”

Section: Introductionmentioning

confidence: 99%

New Case of False-Star-Grass (Chloris distichophylla) Population Evolving Glyphosate Resistance

et al. 2020

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Chloris distichophylla, suspected of glyphosate resistance (GR), was collected from areas of soybean cultivation in Rio Grande do Sul, Brazil. A comparison was made with a susceptible population (GS) to evaluate the resistance level, mechanisms involved, and control alternatives. Glyphosate doses required to reduce the dry weight (GR50) or cause a mortality rate of 50% (LD50) were around 5.1–3 times greater in the GR population than in the GS population. The shikimic acid accumulation was around 6.2-fold greater in GS plants than in GR plants. No metabolized glyphosate was found in either GR or GS plants. Both populations did not differ in the enzyme 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) basal activity or in vitro inhibition of EPSPS activity by glyphosate (I50). The maximum glyphosate absorption was observed at 96 hours after treatment (HAT), which was twofold higher in the GS plants than in the GR plants. This confirms the first case of glyphosate resistance in C. distichophylla. In addition, at 96 HAT, the GS plants translocated more 14C-glyphosate than the GR ones. The best options for the chemical control of both C. distichophylla populations were clethodim, quizalofop, paraquat, glufosinate, tembotrione, diuron, and atrazine. The first case of glyphosate resistance in C. distichophylla was due to impaired uptake and translocation. Chemical control using multiple herbicides with different modes of action (MOA) could be a tool used for integrated weed management (IWM) programs.

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“…Chloris barbata conhecida popularmente como capim-roxo ou capim pé-degalinha-roxo, está presente em vários estados das regiões, Centro-Oeste, Nordeste e Sudeste, possui capacidade de se desenvolver em condições desfavoráveis estando presente tanto em ambientes agrícolas como urbanos (MOREIRA; BRAGANÇA, 2011). Pode se tornar um problema em áreas agrícolas, pois, apresenta biótipos resistentes aos herbicidas Ametryne, Diuron (CABI, 2018) e Glifosato (BRACAMONTE et al, 2018). Os dados de IVI e IR desta espécie bem como o fato de estar presente em ambas as áreas se deve a sua ampla distribuição na região e a facilidade de dispersão das sementes pelo vento.…”

Section: Resultsunclassified

Fitossociologia Em Pomares De Mangueira Irrigados Por Gotejamento E Microaspersão Em Condições Semiáridas

Mesquita¹,

Soares²

2019

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RESUMOSistemas de irrigação pertencentes a um mesmo método podem exercer diferentes impactos sobre a ocorrência e distribuição das plantas daninhas, portanto, objetivouse avaliar o efeito dos diferentes sistemas de irrigação localizada (microaspersão e gotejamento), sobre índices fitossociológicos das plantas daninhas em duas áreas de um pomar de mangueira 'Palmer'. As coletas foram em novembro de 2017 utilizando-se o método do quadrado inventário, de forma aleatória e em caminhamento zigue-zague nas respectivas áreas. Avaliou-se a massa seca (MS), frequência (F), frequência relativa (FR), densidade (D), densidade relativa (DR), dominância relativa (Dor), índice de valor de importância (IVI), importância relativa (IR) das espécies encontradas, e o índice de similaridade ( SJ ij ¿ entre as áreas. No pomar de mangueira irrigado por microaspersão os maiores valores de IVI e IR foram obtidos por Sorghum arundinaceum (137,63; 45,88% respectivamente) e Cyperus rotundus (98,98; 32,99%). Já no pomar irrigado por gotejamento os maiores valores de IVI e IR foram obtidos por Cyperus rotundus (119,54; 39,85% respectivamente) e Chloris barbata, (90,51; 30,17%). A densidade total de plantas daninhas foi semelhante entre as áreas, e o índice de similaridade, baixo (27,27%). Estes resultados sugerem que os sistemas de irrigação avaliados influenciaram a ocorrência de diferentes espécies de plantas daninhas nas áreas em estudo, o que pode implicar em diferentes estratégias de manejo dessas plantas a depender do sistema de irrigação utilizado. PALAVRAS-CHAVE: irrigação, Mangifera indica L., plantas daninhas. PHYTOSOCIOLOGY IN HOSE ORCHARDS IRRIGATED BY DRIP AND MICRO SPRINKLER IN SEMI-ARID CONDITIONSABSTRACT Different irrigation systems may influence the occurrence and distribution of weeds. Therefore, the objective of this study was to evaluate the influence of different irrigation systems (micro sprinkler and drip) on weed phytosociological indexes in two areas of a mango orchard 'Palmer'. Samplings were performed in November 2017, using the inventory square method. The quadrat measured 0.4 m x 0.4 m and was randomly thrown on the field in zigzag. The following data were assessed: dry matter (DM), frequency (F), relative frequency (RF), density (D), relative density (RD),

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From tolerance to resistance: mechanisms governing the differential response to glyphosate in Chloris barbata

Cited by 31 publications

References 43 publications

First Case of Conyza canadensis from Hungary with Multiple Resistance to Glyphosate and Flazasulfuron

First Case of Conyza canadensis from Hungary with Multiple Resistance to Glyphosate and Flazasulfuron

New Case of False-Star-Grass (Chloris distichophylla) Population Evolving Glyphosate Resistance

Fitossociologia Em Pomares De Mangueira Irrigados Por Gotejamento E Microaspersão Em Condições Semiáridas

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