Basis for Antagonism in Mixtures of Bromoxynil Plus Quizalofop-P Applied to Yellow Foxtail (<i>Setaria glauca</i>)

Culpepper, A. Stanley; York, Alan C.; Jordan, David L.; Corbin, F. T.; Sheldon, Yvonna S.

doi:10.1017/s0890037x00046121

Cited by 24 publications

(28 citation statements)

References 19 publications

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“…Esse resultado mostra uma interação antagonística entre esses dois herbicidas, pois verifica-se que o resultado final da dessecação é muito inferior ao resultado observado quando esses compostos foram aplicados isoladamente. Herbicidas que causam destruição da membrana celular, como o MSMA e o paraquat, frequentemente reduzem a absorção e a translocação de outros herbicidas aplicados em mistura (Olson & Nalewaja, 1982;Pereira & Crabtree, 1986;Croon et al, 1989;Culpepper et al, 1999;Burke et al, 2007), fato que pode ter sido a causa do efeito antagônico observado, porém isso não ocorreu nas demais associações envolvendo os herbicidas MSMA e paraquat.…”

Section: Resultsunclassified

Avaliação de diferentes herbicidas para erradicação química de coqueiros infectados com resinose

et al. 2009

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RESUMO -Objetivou-se neste trabalho selecionar herbicidas que possam ser utilizados na erradicação química de coqueiros infectados com resinose. O experimento foi instalado no município de Neópolis -SE, no período de junho a julho de 2007. Utilizou-se uma população de coqueiros da variedade anão-verde, implantada há 11 anos. O delineamento experimental foi o inteiramente casualizado, em parcelas subdivididas no tempo, com cinco repetições (cada unidade experimental foi composta por um coqueiro infectado). Os tratamentos foram formados pela combinação de dez tratamentos herbicidas {MSMA (36 g por planta); glyphosate (18 g por planta); paraquat (10 g por planta); ; tratamento controle (testemunha) sem aplicação} e de quatro épocas de avaliação (7, 14, 21 e 28 dias após a aplicação dos tratamentos herbicidas). Os herbicidas foram injetados no estipe dos coqueiros em um furo de 25 cm de profundidade, 5 cm de diâmetro e inclinação de 45 o , localizado a 1,0 m de altura. A aplicação foi realizada por intermédio de uma seringa graduada, imediatamente após a abertura dos furos, sendo os herbicidas aplicados sem diluição. Foram realizadas quatro avaliações da dessecação dos coqueiros, aos 7, 14, 21 e 28 dias após a aplicação dos tratamentos (DAA). O herbicida MSMA foi o que resultou na dessecação mais rápida dos coqueiros doentes, além de promover a morte de todas as plantas avaliadas, sendo por isso o tratamento mais indicado na continuação dos estudos visando à proposição de uma técnica para a erradicação química de coqueiros infectados com resinose.Palavras-chave: Cocos nucifera, Ceratocystis paradoxa, MSMA, paraquat, glyphosate.ABSTRACT -The objective of this work was to select herbicides that can be used to chemically eradicate coconut palms infected with stem-bleeding. The experiment was carried out in Neopolis, Sergipe, from June to July 2007. The area had been cultivated with the coconut variety green-dwarf for 11 years. The experiment was laid out in a completely randomized design, in split-plots and five replicates (each experimental unit was composed by one coconut tree). Treatments comprised combinations of ten herbicides {MSMA (36 g per plant); glyphosate (18 g ; control treatment with no application} and four evaluation times (7, 14, 21 and 28 days after herbicide application). The herbicides were injected in the stem of the palm plants through a hole 25 cm deep x 5 cm in diameter and 45 o inclination, located at 1 m height. The application was made with a graded syringe immediately after drilling of the holes using undiluted herbicide. The herbicide MSMA resulted in the quickest desiccation of infected coconut trees and killed all the tested plants. Given these results, MSMA was chosen to be tested in further studies aiming to elaborate a technique for the chemical eradication of coconut trees infected with stem-bleeding.

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Section: Resultsunclassified

Avaliação de diferentes herbicidas para erradicação química de coqueiros infectados com resinose

et al. 2009

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“…However, in both biotypes, the level of quizalofop was similar regardless of time, indicating that differential sensitivity of acetyl-CoA carboxylase, which is the molecular target of quizalofop, could be involved in determining the overall response of the biotypes to quizalofop. De-esterification of quizalofop-P-ethyl into quizalofop-P acid was rapid in the treated leaf of yellow foxtail (Setaria glauca) [21]. Further metabolism resulted in a glucose conjugate and a phenolic metabolite.…”

Section: Metabolism and Selectivity Of Accase Inhibitor Aryloxyphenoxmentioning

confidence: 99%

Herbicide Metabolism in Weeds — Selectivity and Herbicide Resistance

Jablonkai¹

2015

Herbicides, Physiology of Action, and Safety

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The metabolic detoxication/bioactivation pathways, the levels and activity of enzymes, and endogenous cofactors mediating these reactions in crops have been well documented; however, much less evidence has been accumulated in weed species. The herbicide metabolism as a selectivity factor is summarized with special attention to acetyl-CoA carboxylases (ACCase)-inhibiting aryloxyphenoxypropionate, protoporphyrinogen IX oxidase (PPO) inhibitor, carotenoid biosynthesis inhibitor clomazone, and acetolactate synthase (ALS) inhibitor imidazolinone and sulfonylurea herbicides in various weed species. The metabolism-based herbicide resistance related to these herbicide classes is also discussed along with the role and level of metabolizing enzymes and cofactors in weed species.

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“…In the case of Setaria glauca (L.) Beauv. (yellow foxtail), the antagonism of quizalofop‐ethyl activity by bromoxynil seemed to be caused primarily by a decreased absorption of quizalofop‐ethyl, with only minor effects on translocation and metabolism (Culpepper et al. , 1999b,c).…”

Section: Introductionmentioning

confidence: 99%

Physiological basis for antagonism induced by mixtures of quizalofop‐ethyl and bromoxynil in maize (Zea mays)

Kim¹,

Won²,

Lee³

et al. 2006

Weed Research

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In this study, the physiological basis for antagonism induced by mixtures of quizalofop-ethyl and bromoxynil was investigated in maize seedlings. In sequential applications, antagonism was observed when bromoxynil was applied before quizalofop-ethyl or in a mixture with quizalofop-ethyl, but was minimal when bromoxynil was applied afterwards. The degree of antagonism differed with application rates of bromoxynil and with the timing of the treatment. When test herbicides were applied locally to the second leaf, the inhibition of photosystem II (PS-II) in the herbicide-treated leaf was higher with the mixture than with bromoxynil or quizalofop-ethyl alone. Subsequent growth of the untreated third leaf inhibited by quizalofop-ethyl alone then recovered, depending on the dose of bromoxynil. There was no evidence that bromoxynil affected absorption of quizalofop-ethyl. In local applications at different positions on the second leaf, antagonism was only observed when quizalofopethyl was applied to the distal part of the leaf and bromoxynil applied to the proximal part. The antagonism of bromoxynil + quizalofop-ethyl did not occur at the level of acetyl CoA carboxylase and Hill reaction, as revealed by in vitro assays. These results suggest that bromoxynil inhibits the phloem transport of quizalofopethyl and thus antagonises its whole-plant activity in maize.

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Basis for Antagonism in Mixtures of Bromoxynil Plus Quizalofop-P Applied to Yellow Foxtail (Setaria glauca)

Cited by 24 publications

References 19 publications

Avaliação de diferentes herbicidas para erradicação química de coqueiros infectados com resinose

Avaliação de diferentes herbicidas para erradicação química de coqueiros infectados com resinose

Herbicide Metabolism in Weeds — Selectivity and Herbicide Resistance

Physiological basis for antagonism induced by mixtures of quizalofop‐ethyl and bromoxynil in maize (Zea mays)

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