Absorção, translocação e metabolismo do glyphosate por plantas tolerantes e suscetíveis a este herbicida

Monquero, Patrícia Andréa; Christoffoleti, Pedro Jacob; Osuna, María Dolores; Prado, Rafael A. De

doi:10.1590/s0100-83582004000300015

Cited by 81 publications

(85 citation statements)

References 12 publications

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“…However, weed tolerance to this compound has been identified in monocot weed Commelina benghalensis, where 41% of the applied glyphosate has been converted to metabolite AMPA at 72 hours after the treatment (Monquero et al, 2004). It is possible that some resistant weed species may have the ability to metabolize glyphosate as a resistance mechanism.…”

Section: Enhanced Metabolismmentioning

confidence: 99%

A Modified phosphate-carrier protein theory is proposed as a non-target site mechanism For glyphosate resistance in weeds

Roso

Vidal

2010

Planta daninha

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-Glyphosate is an herbicide that inhibits the enzyme 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPs) (EC 2.5.1.19). EPSPs is the sixth enzyme of the shikimate pathway, by which plants synthesize the aromatic amino acids phenylalanine, tyrosine, and tryptophan and many compounds used in secondary metabolism pathways. About fifteen years ago it was hypothesized that it was unlikely weeds would evolve resistance to this herbicide because of the limited degree of glyphosate metabolism observed in plants, the low resistance level attained to EPSPs gene overexpression, and because of the lower fitness in plants with an altered EPSPs enzyme. However, today 20 weed species have been described with glyphosate resistant biotypes that are found in all five continents of the world and exploit several different resistant mechanisms. The survival and adaptation of these glyphosate resistant weeds are related toresistance mechanisms that occur in plants selected through the intense selection pressure from repeated and exclusive use of glyphosate as the only control measure. In this paper the physiological, biochemical, and genetic basis of glyphosate resistance mechanisms in weed species are reviewed and a novel and innovative theory that integrates all the mechanisms of non-target site glyphosate resistance in plants is presented.Keywords: membrane carrier proteins, herbicide, weed resistance.RESUMO -Glyphosate é uma glicina fosfonada e inibe a enzima 5-enolpiruvil-shikimato-3-fosfato sintase (EPSPS) (EC 2.5.1.19). EPSPS é a sexta enzima da rota do shikimato, na qual são sintetizados os compostos do metabolismo secundário e os aminoácidos aromáticos fenilalanina, tirosina e triptofano. Alguns autores hipotetizaram que seria improvável a evolução de plantas daninhas resistentes a este herbicida. As justificativas estariam relacionadas à limitada metabolização de glyphosate nas plantas, ao baixo nível de resistência obtido com a superexpressão do gene EPSPS e à alta penalidade de adaptação oriunda de mutações no gene EPSPS. Mas, atualmente estão descritas 18 espécies com biótipos resistentes distribuídas em 17 países. A sobrevivência e adaptação estão relacionadas aos mecanismos de resistência que ocorrem nas plantas daninhas selecionadas em função da intensa pressão de seleção do herbicida. Esta revisão objetiva apresentar e discutir evidências fisiológicas, bioquímicas e genéticas que fundamentam os principais mecanismos envolvidos na resistência ao herbicida glyphosate em plantas daninhas.Palavras-chave: herbicida, proteínas carregadoras de membrana, planta daninha.

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Section: Enhanced Metabolismmentioning

confidence: 99%

A Modified phosphate-carrier protein theory is proposed as a non-target site mechanism For glyphosate resistance in weeds

Roso

Vidal

2010

Planta daninha

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“…After continuous applications of an herbicide with a single action mechanism, there is a natural selection of plants that are poorly affected by its use (Christoffoleti, 2008). Worldwide, many weed species have been described as glyphosate-tolerant, such as Ambrosia artemisiifolia (Kapusta et al, 1994), Sesbania exaltatta (Jordan et al, 1997), Commelina benghalensis (Monquero et al, 2004), Richardia brasiliensis, Borreria latifolia and Tridax procumbens (Galon et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Ipomoea species are among the most glyphosate-tolerant ones (Monquero et al, 2004). Intraspecies differences in glyphosate tolerance may also occur in some species, such as Convolvulus arvensis (Degennaro and Weller, 1984).…”

Section: Introductionmentioning

confidence: 99%

Evolution of Natural Resistance to Glyphosate in Morning Glory Populations

et al. 2017

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-Tolerance, also referred to as natural resistance, is a feature that exists in the plant even before herbicide application in an area. I. grandifolia, I. indivisa and I. purpurea are among the tolerant species most commonly found over fields in southern Brazil. We hypothesized that the intensive use of glyphosate results in increasing levels of tolerance to glyphosate, and in pronounced response variability in populations of the same Ipomoea species. This study aimed at identifying tolerance variations to glyphosate among I. grandifolia, I. indivisa and I. purpurea morning glory species and among populations of these species. In crops over Paraná and Santa Catarina states (Brazil) 31 biotypes were collected (20 I. grandifolia, 7 I. indivisa and 4 I. purpurea), on which were applied 0, 216, 432, 864, 1,296, 1,728 and 2,160 g a.e. ha -1 of glyphosate and the dose required to reduce 50% of dry matter (GR 50 ) was determined. Biotypes of all tested Ipomoea species showed variability of glyphosate tolerance. Tolerance factors had greater amplitude among biotypes of I. gradifolia and I. indivisa species (between 1.7 and 33.6 and between 3.3 and 34.2, respectively) than in I. purpurea (between 3.7 and 4.9). Especially within I. gradifolia e I. indivisa species, some biotypes required a much higher dose than the recommended one to control the wild biotype, indicating progress in the level of glyphosate tolerance; this proves the initial hypothesis of this work. Keywords

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“…Rhizomes increase the ability of weeds, like wandering jew, to persevere in agricultural areas when combined with their underground fruiting bodies (BLANCO, 2010). Moreover, glyphosate-resistant populations of wandering jew have been evolutionarily selected through their differential tolerance to glyphosate (MACIEL et al, 2011) that may be caused by differences in their glyphosate absorption and metabolism rates (MONQUERO et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Variation in the Sensitivity of Wandering Jew Plants to Glufosinate Ammonium

et al. 2017

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-This study aimed to identify the response of wandering jew (Commelina benghalensis L.) plants to different doses of glufosinate ammonium and the sensitivity of plants populations to the herbicide. Two studies were conducted, both in a greenhouse, and were repeated at different times. In the first study, two experiments were conducted to examine the dose-response curve using seven different doses of the glufosinate ammonium herbicide (0, 50, 100, 200, 400, 800, and 1600 g a.i. ha -1 ) with four replicates each. In the second study, which examined the range in sensitivity of wandering jew plants to glufosinate ammonium, 26 plants were sprayed with a dose of 200 g a.i. ha -1 herbicide. Visual assessments of percent injury and measurements of leaf tissue ammonium content were conducted. The use of untreated wandering jew control plants allowed for the correlation of glufosinate ammonium treatment with the ammonium concentrations in treated plant tissues; the ammonium concentration increased as a function of herbicide application, albeit not linearly with the dose. Ammonium content varied among individuals of the wandering jew plant population.Keywords: Ammonia. Commelina benghalensis L.. Glutamine synthetase. Weed. VARIAÇÃO DA SENSIBILIDADE DE PLANTAS DE TRAPOERABA AO AMÔNIO GLUFOSINATERESUMO -Esse trabalho teve como objetivo identificar a resposta de plantas de trapoeraba (Commelina benghalensis L.) a diferentes doses de amônio glufosinate e a sensibilidade de uma população de plantas ao herbicida. Foram realizados dois estudos, ambos implantados em casa de vegetação e repetidos em diferentes momentos. No primeiro, referente à curva de dose-resposta, realizou-se dois experimentos, tendo como tratamentos sete doses do herbicida amônio glufosinate (0; 50; 100; 200; 400; 800; 1600 g i.a. ha -1 ), com quatro repetições cada. Já no segundo, referente à variação da sensibilidade da trapoeraba ao amônio glufosinate, 26 plantas foram pulverizadas com a dose de 200 g i.a. ha -1 do herbicida. Realizou-se avaliações visuais de injúria e análises do teor de amônia nos tecidos foliares. O controle de plantas de trapoeraba pelo amônio glufosinate pode ser correlacionado ao teor de amônia nos tecidos vegetais, que aumenta em função da aplicação do herbicida, porém não de forma linear em função da dose. Houve variabilidade quanto ao teor de amônia entre indivíduos de uma população de trapoeraba.Palavras-chave: Amônia. Commelina benghalensis L.. Glutamina sintetase. Planta daninha.

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Absorção, translocação e metabolismo do glyphosate por plantas tolerantes e suscetíveis a este herbicida

Cited by 81 publications

References 12 publications

A Modified phosphate-carrier protein theory is proposed as a non-target site mechanism For glyphosate resistance in weeds

A Modified phosphate-carrier protein theory is proposed as a non-target site mechanism For glyphosate resistance in weeds

Evolution of Natural Resistance to Glyphosate in Morning Glory Populations

Variation in the Sensitivity of Wandering Jew Plants to Glufosinate Ammonium

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