Fosfito de potássio não protege plantas de milho contra os efeitos fitotóxicos do glyphosate1

Gomes, Giovanna Larissa Gimenes Cotrick; Velini, Edivaldo Domingues; Carbonari, Caio Antônio

doi:10.1590/1983-40632015v4533791

Cited by 5 publications

(6 citation statements)

References 20 publications

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“…As in the present study ( Figure 7 ), other authors also observed an increase or little change in the concentration of aromatic amino acids after exposure of plants to different concentrations of glyphosate [ 39 , 56 , 58 , 61 , 62 , 63 , 64 , 65 , 66 ]. A possible explanation for the increase in aromatic amino acids after herbicide application would be a possible regulatory mechanism after EPSPS expression that controls the content and changes in metabolic regulations in the biosynthesis of these amino acids and protein hydrolysis [ 61 , 65 , 66 ].…”

Section: Discussionsupporting

confidence: 87%

“…The increase in chemical acid at low doses was also observed in sugarcane [ 21 ], in which the authors characterized this increase as the hormetic effect of glyphosate, where the application of 1.8 g ae ha −1 at 35 DAA presented the highest concentrations. In maize, an increase in quinic acid was observed after application of 72 and 720 g ae ha −1 ; however, higher concentrations were observed at the highest dose [ 56 ].…”

Section: Discussionmentioning

confidence: 99%

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Hormetic Effect of Glyphosate on the Morphology, Physiology and Metabolism of Coffee Plants

Costa

Bevilaqua

Krenchinski

et al. 2023

Plants

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Glyphosate is a nonselective herbicide of systemic action that inhibits the enzyme 5-enolpyruvylshikimate-3-phosphate synthase, thus compromising amino acid production and consequently the growth and development of susceptible plants. The objective of this study was to evaluate the hormetic effect of glyphosate on the morphology, physiology, and biochemistry of coffee plants. Coffee seedlings (Coffea arabica cv Catuaí Vermelho IAC-144) were transplanted into pots filled with a mixture of soil and substrate and subjected to ten doses of glyphosate: 0, 11.25, 22.5, 45, 90, 180, 360, 720, 1440, and 2880 g acid equivalent (ae) ha−1. Evaluations were performed using the morphological, physiological, and biochemical variables. Data analysis for the confirmation of hormesis occurred with the application of mathematical models. The hormetic effect of glyphosate on coffee plant morphology was determined by the variables plant height, number of leaves, leaf area, and leaf, stem, and total dry mass. Doses from 14.5 to 30 g ae ha−1 caused the highest stimulation. In the physiological analyses, the highest stimulation was observed upon CO2 assimilation, transpiration, stomatal conductance, carboxylation efficiency, intrinsic water use efficiency, electron transport rate, and photochemical efficiency of photosystem II at doses ranging from 4.4 to 55 g ae ha−1. The biochemical analyses revealed significant increases in the concentrations of quinic acid, salicylic acid, caffeic acid, and coumaric acid, with maximum stimulation at doses between 3 and 140 g ae ha−1. Thus, the application of low doses of glyphosate has positive effects on the morphology, physiology, and biochemistry of coffee plants.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Hormetic Effect of Glyphosate on the Morphology, Physiology and Metabolism of Coffee Plants

Costa

Bevilaqua

Krenchinski

et al. 2023

Plants

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“…The glyphosate-tolerant soybean expresses two versions of the EPSPs enzyme, one native to the species and the other introduced from Agrobacterium sp., which is tolerant to the herbicide (Bervald et al, 2010). Thus, there is no accumulation of chiquimate-3-phosphate in the plant and no reduction in biomass or other components of agronomic interest in resistant plants (Gomes et al, 2015). Some authors consider that the symbiotic bacterium does not have the same tolerance to the herbicide, which may reduce its efficiency; however, it is also reported that both the plant and the bacterium have the capacity to recover after a few days of application (King et al, 2001).…”

Section: Resultsmentioning

confidence: 99%

Development of RR soybean in function of glyphosate doses and Bradyrhizobium inoculation

Bossolani

Poloni

Lazarini

et al. 2018

Rev. bras. eng. agríc. ambient.

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A B S T R A C TSoybean has traditionally been produced in systems that include the use of herbicides, often in higher than recommended doses. The process of symbiotic nitrogen fixation in legumes can be hampered by these herbicides, both by direct effects on rhizobia and indirect effects on the host plant. An outdoor experiment was performed to evaluate the effects of different doses of a glyphosate herbicide on Bradyrhizobium strains and biological nitrogen fixation in soybean BMX Potência RR plants. Soybean seeds were inoculated with Bradyrhizobium elkanii (SEMIA 5019) and Bradyrhizobium japonicum (SEMIA 5079) strains in a commercial liquid inoculant. The treatments consisted of the absence and presence of Bradyrhizobium genotypes inoculated via seed and four doses of the herbicide glyphosate applied on the leaves (0, 1.0, 2.0, and 4.0 L ha -1 of the commercial product) at the V 3 stage. The leaf chlorophyll index of inoculated RR soybean plants did not change on the application of glyphosate and, regardless of inoculation, plants had the capacity to recover from the effects of glyphosate application, without impaired development.Desenvolvimento da soja RR em função de doses de glifosato e da inoculação com Bradyrhizobium R E S U M OA soja tem sido produzida, tradicionalmente, em sistemas que incluem a utilização de herbicidas, muitas vezes em doses acima das recomendadas. O processo de fixação simbiótica de nitrogênio em leguminosas pode ser prejudicado por esses herbicidas, tanto por efeitos diretos sobre o rizóbio, como indiretos, sobre a planta hospedeira. Com o objetivo de avaliar o efeito de doses do herbicida glifosato sobre estirpes de Bradyrhizobium e a fixação biológica de nitrogênio em plantas de soja BMX Potência RR, foi realizado um experimento em vasos, conduzido a céu aberto. As sementes de soja foram inoculadas com as estirpes de Bradyrhizobium elkanii (SEMIA 5019) e Bradyrhizobium japonicum (SEMIA 5079). Foi utilizado um inoculante líquido comercial. Os tratamentos constituíram-se na ausência e presença das bactérias do gênero Bradyrhizobium inoculadas via semente e quatro doses do herbicida glifosato via foliar (0; 1,0; 2,0 e 4,0 L ha -1 do produto comercial) e aplicadas no estádio fenológico V 3 . A soja RR inoculada não altera o índice de clorofila foliar pela aplicação de glifosato e independentemente da inoculação, possui a capacidade de se recuperar da aplicação do glifosato, não prejudicando seu desenvolvimento.

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“…Phenolic compounds originate from secondary metabolism. The more importante are tannins, lignans, coumarins, lignins and flavonoids (Gomes et al, 2015). Among the various functions of these metabolites, it is worth noting their antimicrobial and antioxidant action, due to the absorption and neutralization of free radicals, chelating the triplet and singlet oxygen or decomposing peroxides (Olivoto et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Biological Potential of Extracts of Caatinga Plants in the Control of Alternaria alternata f. sp. citri in Citrus

Pinto¹,

Melo²,

Nascimento³

et al. 2018

JAS

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In Brazil the Caatinga biome is formed by endemic species with numerous applications in medicine, cosmetics and agrochemicals. However, only 8% of the country’s plant species are chemically evaluated annually. Thus, the work aimed to determine the free amino acid composition and phenolic substances of Caatinga plant species extracts, their antioxidant activity and the potential use of these compounds in the control of A. alternata in citrus. Leaf extracts from fourteen native plant species were evaluated for free amino acid contents; total and individual polyphenols; total flavonoids and antifungal susceptibility test. The relationship between the contents of the compounds detected in each plant extract with its antioxidant capacity and antifungal activity, has not yet been fully clarified. However, it is a fact that the extract of Cleome hassleriana constitutes a source rich in free amino acids. It is also verified that the extracts of Mimosa tenuiflora and Caesalpinia ferrea are efficient alternatives in the control of Alternaria alternata in citrus, because they present similar results for this purpose, and in the evaluation of their compositions in free amino acids, phenolic substances and antioxidant activity.

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Fosfito de potássio não protege plantas de milho contra os efeitos fitotóxicos do glyphosate1

Cited by 5 publications

References 20 publications

Hormetic Effect of Glyphosate on the Morphology, Physiology and Metabolism of Coffee Plants

Hormetic Effect of Glyphosate on the Morphology, Physiology and Metabolism of Coffee Plants

Development of RR soybean in function of glyphosate doses and Bradyrhizobium inoculation

Biological Potential of Extracts of Caatinga Plants in the Control of Alternaria alternata f. sp. citri in Citrus

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