Biodegradação de glifosato pela microbiota de solos cultivados com macieira

Andrighetti, Marília Scopel; Nachtigall, G. R.; Queiroz, S. C. do N. de; Ferracini, V. L.; Ayub, Marco Antônio Záchia

doi:10.1590/s0100-06832014000500029

Cited by 15 publications

(13 citation statements)

References 19 publications

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“…Glyphosate is one of the most used herbicides in agriculture, and several authors consider it to be one of the least toxic herbicides for nodulation and subsequent BNF (Böhm & Rombaldi, 2010;Santos, 2015). Some studies indicate that soil microorganisms possess the ability to adapt to the application of this herbicide, obtaining, over time, low sensitivity to its presence, and growing suitably for symbiosis even at higher product concentrations (Galli & Montezuma, 2005;Andrighetti et al, 2014).…”

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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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 possible explanation is the effect of some by-product that remained active in the soil from the interaction between the two herbicides, which may have provided an increase in the residual of the 2,4-D herbicide. Furthermore, microbial degradation is the key process in the degradation of most herbicides in the soil, being valid for both glyphosate (Andrighetti et al, 2014) and 2,4-D (Araújo and Orlanda, 2014). When these herbicides are applied in combination, there may be a possible overload of the soil microbiota, which slows down the degradation of the herbicides and provides greater persistence, mainly of 2,4-D; which can affect sowed soybean plants at different times after application.…”

Section: And the Adjustedmentioning

confidence: 99%

Carryover of herbicides used in cotton stalk control on soybean cultivated in succession

et al. 2020

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“…Another important factor associated with decomposition is the relationship between herbicide use and soil microbial biomass since herbicides interfere with the dynamics of edaphic microorganisms, altering decomposition rates. According to Andrighetti et al (2014), glyphosate may have deleterious effects on bacterial communities. However, as reported in the literature, glyphosate application following the recommended doses does not lead to negative changes in microbial populations (Giesy et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

Productivity, Control, and Decomposition of Irrigated Forage Species under Glyphosate Doses and Shading

et al. 2018

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Light intensity available in growing environments may influence the susceptibility of plants to glyphosate and decomposition of their residues. This study aimed to assess the productivity, control, and decomposition of forage straw submitted to glyphosate doses and exposed to full sun and 50% shade. Two experiments were carried out, one for Piatã grass (Urochloa brizantha cv. Piatã) and other for Tanzania grass (Megathyrsus maximus cv. Tanzania). The experimental design was a randomized block design with strip-plot and four replications. Two growing environments (at full sun and under 50% shade) were installed in strips in the growing area, combined with six doses of glyphosate (0, 360, 720, 1,080, 1,440, and 1,800 g a.e. ha-1) used for forage desiccation. Shade did not change Tanzania grass productivity (p<0.05), but it reduced Piatã grass productivity (p>0.05), suggesting its low tolerance to light restriction. Tanzania grass is more tolerant to glyphosate when compared to Piatã grass, especially at full sun conditions. In general, the evaluated forages present a high susceptibility to glyphosate as incident radiation is reduced, which allows using lower doses to desiccate them in shaded environments. Straw decomposition of Piatã and Tanzania grasses was slower under shading. In this environment with light restriction, straw is more durable and has a better quality for the no-tillage system.

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Biodegradação de glifosato pela microbiota de solos cultivados com macieira

Cited by 15 publications

References 19 publications

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

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

Carryover of herbicides used in cotton stalk control on soybean cultivated in succession

Productivity, Control, and Decomposition of Irrigated Forage Species under Glyphosate Doses and Shading

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