Aspectos do mecanismo de ação do amônio glufosinato: culturas resistentes e resistência de plantas daninhas

Brunharo, Caio Augusto de Castro Grossi; Christoffoleti, Pedro Jacob; Nicolai, Marcelo

doi:10.7824/rbh.v13i2.293

Cited by 18 publications

(13 citation statements)

References 69 publications

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“…Carfentrazone-ethyl and saflufenacil (inhibitors of the enzyme protoporphyrinogen oxidase), paraquat (inhibitor of photosynthesis -Photosystem I) and diuron (inhibitor of photosynthesis -Photosystem II) are little mobile or immobile through the phloem, so that their actions are basically of contact (Grossmann et al, 2010;Oliveira Júnior, 2011). On the other hand, glufosinate-ammonium, inhibitor of the enzyme glutamine synthetase, is considered as a herbicide of limited translocation in the phloem because its application causes rapid phytotoxicity due to the accumulation of ammonia in plant cells (Brunharo et al, 2014). Thus, the localized action of the herbicides in the shoots of cotton stalks, which showed poorly vigorous vegetative structures, exposed to environments with low water contents in the soil, low relative air humidity, milder temperatures and with dust accumulated on the leaves and regrowths, certainly contributed to the reduction in the metabolic activity of cotton stalks and to the lower effectiveness of the herbicides.…”

Section: Resultsmentioning

confidence: 99%

Chemical control of stalk regrowth in glyphosate-resistant transgenic cotton

Ferreira

Bogiani

Sofiatti

et al. 2018

Rev. bras. eng. agríc. ambient.

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Cotton stalk regrowth must be controlled after harvest to ensure the phytosanitary quality and sustainability of cotton farming systems. Mechanical destruction generally does not conform to the no-tillage system, and the control of cotton stalk regrowth by herbicides is little studied in Brazil. The objective of this study was to evaluate the efficiency of herbicides to control glyphosate-resistant transgenic cotton stalk regrowth. The study was conducted in three environments of the Brazilian Cerrado region, two in Santa Helena de Goiás (SHGO), during 2013 and 2014, and one in Luís Eduardo Magalhães (LEM-BA) in 2014. In each of the three environments, the experiment was carried out in a randomized complete block with four replications. Each experiment consisted of different combinations of herbicides and one untreated control. Cotton stalk regrowth was influenced by the three environments. Two sequential 2,4-D amine applications, each with 1,000 g ha-1 of acid equivalent, resulted in better cotton stalk destruction, albeit with 4.9, 16.9 and 36.9% of cotton stalk regrowth in SHGO 2013 and 2014, and LEM-BA 2014, respectively. A single application of 2,4-D amine and a 2,4-D amine spraying followed by the application of carfentrazone-ethyl, paraquat, saflufenacil, paraquat + diuron or glufosinate-ammonium are not effective to control glyphosate-resistant transgenic cotton stalk regrowth. The best destruction of cotton stalk regrowth occurs with two sequential applications of 2,4-D amine.

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Section: Resultsmentioning

confidence: 99%

Chemical control of stalk regrowth in glyphosate-resistant transgenic cotton

Ferreira

Bogiani

Sofiatti

et al. 2018

Rev. bras. eng. agríc. ambient.

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“…Starting from the 7 until the 21 DAE this treatment kept with good control of the weed, superior than 88%, what is considered suitable, because to present good efficiency the literature indicates to have control superior than 80% (Oliveira et al 2009). According to Brunharo et al (2014) the interaction between herbicides pre-emerging and post-emergent can result in more effective control of the weeds in annual or perennial cultures. The treatment of glyphosate + diuron + sulfentrazone did not differ from the treatment ammonium-glufosinate + diuron + sulfentrazone in all the evaluations of control of U. plantaginea.…”

Section: Resultsmentioning

confidence: 99%

Weed management in soybean using burndown herbicides associated to pre-emergent herbicides

Santin¹,

Peruzzo²,

Galon³

et al. 2019

Commun. Plant Sci.

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The soybean crop has been playing a very important role in the agribusiness worldwide, including in Brazil. Among the pests that cause major problems to the crop are the weeds, because they are responsible by the reduction of the productivity and of the grain quality. On the face of it, this work aimed to evaluate the application of burndown herbicides associated to pre-emerging herbicides to the management of the soybean weeds. The experiment was carried out in the field, in area with no soil cover with fallow during the winter, in the randomized block design, with four replicates. The treatments used were: diuron + sulfentrazone (490 + 245), [glyphosate + (diuron + sulfentrazone)-1,440 + (420 + 210)], [glyphosate + (diuron + sulfentrazone)-1,440 + (490 + 245)], glyphosate + 2,4-D (1,440 + 806), glyphosate + diclosulam (1,440 + 25.2), [glyphosate + (imazethapyr + flumioxazin)-1,440 + (100 + 50)], glyphosate + saflufenacil (1,440 + 35), [ammonium-glufosinate + (diuron + sulfentrazone)-400 + 490 + 245 g ha-1 de i.a], and two herbicide-free controls, weedy and weed-free. At the 7, 14, 21 and 28 days after the emergency of the crop (DAE) the variables were evaluated, herbicide phytotoxicity on soybean and the weeds control, Digitaria ciliaris and Urochloa plantaginea. In the soybean harvest, the number of pods per plant was determined, the number of grains per pods, the mass of a thousand grains (g) and the grain productivity (kg ha-1). The phytotoxicity caused by herbicides to the soybean it was not over to 8% in all the evaluations realized. The control of the weeds, D. ciliaris and U. plantaginea were over to 90%, highlighting the effect of the pre-emerging herbicides in the maintaining of the control until the evaluation of the 28 DAE. In general, all the treatments involving the herbicides did not cause changes in the components of soybean crop yield, being statistically equal the weed-free control higher than the weedy control. The soybean presented an increase of 859.48% in grain yield when Digitaria ciliaris and of the Urochloa plantaginea was controlled. Highlighted Conclusions 1. The control of Digitaria ciliaris and Urochloa plantaginea is more efficient with the use of pre-emerging herbicides, mainly diuron + sulfentrazone and imazethapyr + flumioxazin. 2. The toxicity of herbicides to the soybean 'NA 5909' is low, with no visual intoxication symptoms from 28 days after emergency, and do not reduce the crop grain yield. 3. Digitaria ciliaris and Urochloa plantaginea can reduce by up to 88% the soybean grain yield if not controlled. 4. The soybean grain productivity can be increased by 859% when Digitaria ciliaris and Urochloa plantaginea are controlled.

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“…No entanto, o posicionamento da indústria é desenvolver culturas com várias resistência a herbicidas (Grenn, 2009). Há além das culturas RRs, a introdução no mercado de inúmeras alternativas de transgenias e dentre estas, muitas relacionadas com a introdução de genes com capacidade de detoxificar ou metabolizar herbicidas, como a resistência ao 2,4-D, amônio glufosinato, dicamba dentre outros (Brunharo et al, 2014;Queiroz e Vidal, 2014). Em adição, há a formação de culturas resistentes aos herbicidas através de mutagênese, como é o exemplo da cultura do arroz resistente a imidazolinonas, pertencente ao mecanismo de ação dos herbicidas inibidores da enzima ALS.…”

Section: Culturas Resistentes a Herbicidasunclassified

Biologia molecular aplicada à ciência das plantas daninhas

et al. 2018

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Resumo -As plantas daninhas possuem elevada variabilidade genética, e principalmente por este motivo, são adaptadas a ambientes com intensa atividade humana. Embora o controle de plantas daninhas tenha evoluído de maneira positiva nos últimos anos, elas continuam a interferir na produção agrícola. O objetivo desta revisão bibliográfica é apresentar a contribuição da biologia molecular nos estudos aplicados a herbologia. Há lacunas entre o que aprendemos sobre genômica de plantas daninhas e como esses conhecimentos poderiam nos auxiliar no manejo e melhorar a competividade de culturas agrícolas frente às plantas daninhas. Muitos estudos na área da ciência das plantas daninhas podem ser realizados com o emprego de técnicas de biologia molecular, sendo eles: caracterização do genoma de espécies de plantas daninhas, visando à identificação destes com maior acurácia, identificação de espécies resistentes a herbicidas e seu mecanismo de resistência, variabilidade e similaridade genética entre populações de plantas daninhas, identificação de genes envolvidos nos processos de interação entre plantas, dentre outros. Palavras-chave: herbicidas, variabilidade genética, genômica, DNA, biotecnologia Abstract -The weeds have high genetic variability, mainly for this, they are adapted to environments disturbed by humans. Although weed control has evolved positively in recent years, they continue to interfere with agricultural production. The objective of this bibliographic review is to present the contribution of molecular biology in the studies applied to herbology. There area gap in what we learn about weed genomics, which could help us manage and improve the competitiveness of weed crops. Many studies in the field of weed science can be carried out using molecular biology techniques. The characterization of the genome of weed species, aiming to identify species with higher accuracy, identification of herbicide resistant species and its mechanism of resistance, genetic variability and similarity among weed populations, identification of genes involved in the interaction processes between plants, among other.

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Aspectos do mecanismo de ação do amônio glufosinato: culturas resistentes e resistência de plantas daninhas

Cited by 18 publications

References 69 publications

Chemical control of stalk regrowth in glyphosate-resistant transgenic cotton

Chemical control of stalk regrowth in glyphosate-resistant transgenic cotton

Weed management in soybean using burndown herbicides associated to pre-emergent herbicides

Biologia molecular aplicada à ciência das plantas daninhas

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