Análises fisiológicas e morfoanatômicas de cenostigma macrophyllum tul. (fabaceae) submetida a diferentes concentrações de glifosato

Santos, Vanessa Ribeiro de Sousa; Filho, Ailton José Crispim; Santana, Marinna Maciel; Costa, Ana Letícia Rodrigues; Silva, Kellen Lagares Ferreira

doi:10.6008/cbpc2179-6858.2020.005.0017

Cited by 5 publications

(9 citation statements)

References 18 publications

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“…There was a signifi cant reduction in thickness, in the adaxial epidermis and in the palisade and spongy parenchyma, and in higher doses the tissues were collapsed, the palisade and spongy parenchyma disorganized, with a twisted aspect. Santos et al (2020), found similar symptoms in the Cenostigma macrophyllum species, mainly in the highest dose of glyphosate applied. For these authors, the reduction of observed leaf tissues may have contributed to the defi ciency of CO 2 diff usion in the mesophyll, a fact also observed in the present study.…”

Section: Discussionmentioning

confidence: 59%

“…Brazilian agriculture has grown at an accelerated pace, infl uenced by the exploration of new arable areas, associated with the modernization of machinery and implements, and the strengthening of the input sector (Belchior et al, 2014). In the last four decades, the expansion of agriculture in the Cerrado was the one that most contributed to the increase of the sector in the country, standing out in the production of soybeans, corn, cotton, sugar cane, sorghum and rice (Santana et al, 2020). However, even though it is of great importance for the Brazilian economy, agribusiness has caused several impacts to natural resources, mainly due to the exacerbated use of pesticides, which directly aff ect the soil, water resources and biodiversity (Gomes, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Among the most widely used herbicides worldwide, glyphosate (N-phosphonomethyl glycine) stands out (Benbrook, 2016). This herbicide acts directly on the enzyme 5 enolpyruvyl-shikimate-3phosphatesynthase (EPSPS), inhibiting it, aff ecting the metabolic route of shikimic acid, which reduces the synthesis of essential aromatic amino acids, such as phenylalanine, tyrosine and tryptophan (Kirkwood and Mckay, 1994;Freitas-Silva et al, 2020;Santos et al, 2020). One of the most expressive characteristics of glyphosate is its rapid translocation, resulting in total destruction of plants in a short period, also having action on seeds in the soil, thus expressing its high degree of toxicity (Yamada and Castro, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Some research has evaluated the damage caused by glyphosate drift on native species in controlled environments, Silva et al (2016), demonstrated that this herbicide aff ected all photosynthetic variables of the species Caryocar brasiliense Camb., as well as Batista et al (2018), in Pouteriatorta. Santos et al (2020), found that in the species Cenostigma macrophyllum Tul., gliphosate caused photosynthetic and anatomical damage, the same was described by Freitas- , in the species Handroanthus chrysotrichus and Garcinia gardneriana, and Cruz et al (2021), in Eugenia unifl ora L. However, there is still a lack of studies on the potential damage to forest species caused by the application of herbicides (Brancalion et al, 2009). Therefore, prior knowledge of the morphoanatomical and physiological responses of native plants exposed to herbicides, acquired in controlled environments is essential, as they will serve as a tool to support the monitoring of the eff ects of glyphosate drift in natural vegetation.…”

Section: Introductionmentioning

confidence: 99%

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PHYSIOLOGICAL AND MORPHOANATOMIC RESPONSES OF Bowdichia virgilioides KUNTH. (FABACEAE) TO GLYPHOSATE

Oliveira¹,

Filho

Santos

et al. 2021

Rev. Árvore

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The expansion of agribusiness in Brazil is partly due to the expansion of arable areas in the Cerrado biome, which, consequently, leads to an increase in the use of herbicides, including glyphosate. Therefore, the objective of this study was to evaluate the physiological and morphoanatomic responses of Bowdichia virgilioides Kunth. (Fabaceae), when exposed to the herbicide glyphosate, under controlled greenhouse conditions. In addition, the study proposed to identify possible response patterns of the studied species and provide subsidies for the study of the species in areas affected by the drift of the herbicide. The experimental design was in randomized blocks, with seven doses of the herbicide: 25, 50, 100, 200, 400, 800, and 1200 g i.a ha-1 besides the control (0), with four repetitions each. Gas exchange, chlorophyll a fluorescence emission, chloroplast pigment content, membrane permeability, and visual and anatomical features were analyzed. The results showed that glyphosate is phytotoxic to B. virgilioides because, even at low doses, this herbicide was able to affect all parameters analyzed. There was also confirmation of the presence of phenolic compounds, mainly in the palisade parenchyma. The metabolic alterations presented demonstrated the sensitivity of B. virgilioides to glyphosate. Thus, the observed responses can serve as a tool for diagnosing the effects of glyphosate exposure on this species, present in native areas affected by the drift of this herbicide. Its indiscriminate use poses a risk to Cerrado biodiversity.

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Section: Discussionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PHYSIOLOGICAL AND MORPHOANATOMIC RESPONSES OF Bowdichia virgilioides KUNTH. (FABACEAE) TO GLYPHOSATE

Oliveira¹,

Filho

Santos

et al. 2021

Rev. Árvore

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“…Entre os principais impactos relacionados ao avanço do agronegócio no Cerrado, destaca-se o uso de produtos químicos, como fertilizantes e agrotóxicos que têm como objetivo maximizar a produção e proteger o cultivo (DUTRA; SANTOS et al, 2020).…”

Section: Introductionunclassified

Análises Fisiológicas de Genipa americana L. (Rubiaceae), Quando Exposta A Diferentes Concentrações de Glifosato

et al. 2022

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Considerado como a última fronteira agrícola do Brasil, o domínio Cerrado, um dos hotspots mundiais de biodiversidade, sofre com a pressão exercida pelo agronegócio. Entre as ameaças está o uso de agrotóxicos, que chega a regiões não alvo através da deriva, como as áreas nativas. Entre as espécies atingidas está a Genipa americana L., sendo essa uma espécie nativa, com características medicinais e de relevante interesse comercial. Objetivou-se caracterizar os parâmetros fisiológicos da G. americana, quando exposta a diferentes concentrações de glifosato, visando identificar a sensibilidade da espécie ao herbicida. A simulação da deriva foi realizada aplicando-se o herbicida glifosato nas doses 0 (controle), 25, 100, 200, 400 e 800 g i.a.h-1. Para avaliação das trocas gasosas foram realizadas quatro medições, 2º, 5º, 11º e 14º dias após a aplicação (DAA) do herbicida. Os parâmetros fisiológicos avaliados foram: taxa fotossintética (A), transpiratória (E), condutância estomática (gs), relação entre a concentração interna e externa de CO2 (Ci/Ca), eficiência instantânea de carboxilação (A/Ci), o conteúdo de pigmentos cloroplastídicos e a permeabilidade de membranas. Os parâmetros de trocas gasosas em G. americana apresentaram efeitos negativos e progressivos, conforme o aumento das doses do herbicida glifosato. Foi possível observar uma diminuição em gs, A, E, Ci/Ca e A/Ci, no primeiro dia de avaliação, nas doses 400 e 800 g i.a ha-1 em relação ao controle. O conteúdo de pigmentos cloroplastídicos e a permeabilidade de membranas não foram significativos e não são bons parâmetros para efeitos fitotóxicos de glifosato em G. americana. Palavras-chave: Herbicida. Jenipapo. Trocas Gasosas. Abstract Considered as the last agricultural frontier in Brazil, the Cerrado domain, one of the world's biodiversity hotspots, suffers from the pressure exerted by agribusiness. Among the threats is the use of pesticides, which reach non-target regions through drift, such as native areas. Among the affected specie is the Genipa americana L., a native species, with medicinal characteristics and relevant commercial interest. The objective was to characterize the physiological parameters of G. americana, when exposed to different concentrations of glyphosate, in order to identify the species’ sensitivity to the herbicide. Drift simulation was performed by applying the herbicide glyphosate at doses 0 (control), 25, 100, 200, 400 and 800 g a.i.h-1. To assess gas exchange, four measurements were performed, 2nd, 5th, 11th and 14th days after the application (AAH) of the herbicide. The physiological parameters evaluated were: photosynthetic rate (A), transpiration (E), stomatal conductance (gs), relationship between internal and external CO2 concentration (Ci/Ca), instantaneous carboxylation efficiency (A/Ci), content of chloroplast pigments and the permeability of membranes. The gas exchange parameters in Genipa americana showed negative and progressive effects, as the doses of the herbicide glyphosate increased. It was possible to observe a decrease in gs, A, E, Ci/Ca and A/Ci, on the first day of evaluation, at doses 400 and 800 g ai ha-1 compared to the control. The chloroplast pigment content and membrane permeability were not significant and are not good parameters for phytotoxic effects of glyphosate on G. americana. Keywords: Herbicide. Jenipapo. Gas Exchange

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Plant exposure to glyphosate-based herbicides and how this might alter plant physiological and structural processes

Freitas-Silva

Araújo

Meireles

et al. 2022

Botany

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Chemical weed control is essential to ensure high levels of productivity in agricultural areas, and glyphosate-based herbicides (GBHs) are the most widely used herbicides at a global scale. GBHs inhibit the 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPS) enzyme, which impairs the shikimate pathway and often leads to plant death. However, indirect effects of GBHs on plant physiology can also lead to plant death. The objectives of this review are to discuss the biochemical, physiological and structural changes GBH application produces in plant species, in addition to inhibiting EPSPS (EC 2.5.1.19), and to reveal how these changes contribute to plant death. We conclude that GBHs promote plant death not only because of EPSPS inhibition but also due to biochemical, physiological and structural changes. Some changes are recurrent and can be used as biomarkers of GBH sensitivity, which can contribute to future works that monitor the presence of these herbicides in plant communities near agricultural areas.

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Análises fisiológicas e morfoanatômicas de cenostigma macrophyllum tul. (fabaceae) submetida a diferentes concentrações de glifosato

Cited by 5 publications

References 18 publications

PHYSIOLOGICAL AND MORPHOANATOMIC RESPONSES OF Bowdichia virgilioides KUNTH. (FABACEAE) TO GLYPHOSATE

PHYSIOLOGICAL AND MORPHOANATOMIC RESPONSES OF Bowdichia virgilioides KUNTH. (FABACEAE) TO GLYPHOSATE

Análises Fisiológicas de Genipa americana L. (Rubiaceae), Quando Exposta A Diferentes Concentrações de Glifosato

Plant exposure to glyphosate-based herbicides and how this might alter plant physiological and structural processes

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