Glyphosate

Duke, Stephen O.; Baerson, Scott R.; Rimando, Agnes M.

doi:10.1002/047126363x.agr119

Cited by 43 publications

(24 citation statements)

References 56 publications

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“…Although the photosynthetic process is not the primary target of glyphosate in plants, some studies have shown a reduction in A triggered by this herbicide (Duke et al, 2003;Mateos-Naranjo et al, 2009;Orcaray et al, 2010), which supports the results of this study. Yamada and Castro (2007) postulated that the reduced efficiency of gas exchange due to glyphosate is associated with dysregulation of stomatal closure and thus with changes in the opening and closing of stomata.…”

Section: Discussionsupporting

confidence: 91%

“…Reversible and irreversible changes in plant metabolism can be used as bioindicators for the action of xenobiotics (Boutin et al, 2014). Some of the biomarkers used in biomonitoring are the changes in the structure of nucleic acids (Wang et al, 2016), chlorophyll a fluorescence, gas exchange (Duke et al, 2003;MacFarlane, 2003), chloroplastid pigment content (Prasad et al, 2015), metabolites, proteins (Schrübbers et al, 2014;Dayan et al, 2015;Hattab et al, 2016), and the occurrence of chlorosis and necrosis in leaves (De-Temmerman et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Pouteria torta: a native species of the Brazilian Cerrado as a bioindicator of glyphosate action

et al. 2017

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In Brazil, the expansion of agricultural activity and the associated indiscriminate use of herbicides such as glyphosate is directly related to the loss of biodiversity in the Cerrado. The identification of plant species as bioindicators of herbicide action, especially species native to the area, can help in monitoring the impacts of xenobiotics in the remaining Cerrado. Thus, this study was designed to evaluate the possible use of the native Cerrado species Pouteria torta as a bioindicator of glyphosate action via changes in physiological performance. At 16 months after sowing, the effect of glyphosate was evaluated by applying the following doses: 0 (control), 25, 50, 100, 200, 400, 800, and 1200 g a.e. ha -1 . In response to glyphosate, P. torta exhibited reductions in photosynthesis and chloroplastid pigment content, as well as accumulation of shikimic acid and the occurrence of chlorosis and necrosis. These changes demonstrate the high sensitivity of P. torta to glyphosate and its potential for use as a bioindicator of this herbicide.Keywords: phytotoxicity, photosynthetic processes, biomarker, guapeva, herbicide. Pouteria torta: espécie native do Cerrado Brasileiro como bioindicadora da ação do glyphosate ResumoNo Brasil, a expansão da atividade agrícola, aliada a utilização indiscriminada de herbicidas como o glyphosate, possui relação direta com a perda da biodiversidade no Cerrado. A identificação de espécies vegetais bioindicadoras da ação de herbicidas, particularmente as nativas do Cerrado, pode auxiliar em processos de monitoramento dos impactos desse xenobiótico nas remanescentes do Cerrado. Assim, este estudo foi projetado para avaliar o possível uso de Pouteria torta, espécie nativa do cerrado, como bioindicadora da ação do glyphosate via mudanças na sua performance fisiológica. Após 16 meses de semeadura, o efeito do glyphosate foi avaliado quando aplicadas as seguintes doses: 0 (controle), 25, 50, 100, 200, 400, 800 e 1200 g e. a. ha -1 . Em reposta ao glyphosate, as plantas de P. torta apresentaram redução na sua performance do processo fotossintético e no conteúdo de pigmentos cloroplastídicos, além do acúmulo de ácido chiquímico e da ocorrência de cloroses e necroses. Essas alterações demonstram a alta sensibilidade de P. torta ao glyphosate, o que potencializa a sua utilização como bioindicadora da ação desse herbicida.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Pouteria torta: a native species of the Brazilian Cerrado as a bioindicator of glyphosate action

et al. 2017

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“…However, the extraction of shikimic acid directly from the plant tissue requires a long time and large amounts of reagents, so the methods of extraction in water, using solvent extraction assisted by microwave, have been presented as a simple form of shikimic acid extraction (Matallo et al 2009). Another way to evaluate the resistance to glyphosate is the inhibitory effect of plant photosynthesis (Duke et al, 2003). The photosynthetic rate, transpiration, carboxylation efficiency and water use efficiency are parameters that may indicate the effect of glyphosate on the plant.…”

Section: Introductionmentioning

confidence: 99%

Glyphosate influence on the physiological parameters of Conyza bonariensis biotypes

et al. 2014

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-The objective of this study was to determine changes in gas exchange and inhibition of EPSPs, based on the accumulation of shikimic acid in horseweed biotypes resistant and sensitive to glyphosate. Two experiments were conducted in a factorial model. The first one evaluated horseweed biotypes (one resistant and one susceptible to glyphosate), and herbicide rates (0 and 1,080 g a.e. ha 1 ) applied on the weed. In the second experiment, the horseweed biotypes (susceptible and resistant to glyphosate) were evaluated in five periods as following: 0, 3, 7, 10, and 14 days after herbicide application (DAH). The photosynthetic rate, transpiration, carboxylation efficiency, and water efficiency were determined using an infrared gas analyzer (IRGA), and shikimic acid concentration by HPLC. The application of glyphosate damaged the photosynthetic parameters of the susceptible biotype, causing complete inhibition of the photosynthetic rate, transpiration rate, carboxylation efficiency and water use efficiency, starting from the 7 DAH. On the other hand, total inhibition of the photosynthetic parameters was not observed for the resistant biotype. Shikimic acid accumulation occurred in both biotypes after glyphosate application but the susceptible biotype had the highest concentrations, indicating greater sensitivity of the enzyme EPSPs. The accumulation of shikimic acid in the resistant biotype indicates that the mechanism of resistance is not related to the total insensitivity of the enzyme EPSPs to glyphosate and/or that other resistance mechanisms may be involved.Keywords: hairy fleabane, resistance, photosynthesis, EPSPs, shikimic acid. RESUMO -Objetivou-se neste trabalho determinar alterações na fotossíntese e na inibição da EPSPs

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“…Thus, shikimic acid accumulation in plants can be used to determine if plants are resistant to glyphosate when the resistance mechanism is insensitivity of EPSPs (Carvalho et al 2012). Another way to evaluate resistance is by means of the inhibitory effect of photosynthesis in plants after glyphosate application (Duke et al 2003). Thus, the aim of this study was to determine changes in the photosynthetic process and inhibition of EPSPs, through shikimic acid accumulation, after glyphosate application in four biotypes of C. sumatrensis collected in the state of Rio Grande do Sul, southern Brazil.…”

Section: Introductionmentioning

confidence: 99%

Effect of glyphosate on the physiological parameters of horseweed

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Christoffoleti

et al. 2014

Agraria

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The aim of this study was to determine changes in the photosynthetic process and the inhibition of 5-enolpyruvylshikimate-3-phosphate synthase (EPSPs) by shikimic acid accumulation, after application of the herbicide glyphosate in four biotypes of C. sumatrensis collected in the state of Rio Grande do Sul. Therefore, the experiments were conducted under greenhouse and laboratory, assessing plant biomass, photosynthesis rate, transpiration and water use efficiency; the amount of shikimic acid was calculated for each treatment. Glyphosate application reduced growth and affected the photosynthesis rate and water use efficiency of the biotypes differentially, and the resistant biotype had small interference from glyphosate, while physiological parameters of the susceptible biotype were deeply affected by the herbicide. Susceptible biotypes had higher shikimic acid accumulation than the resistant biotype, indicating differential sensitivity of EPSPs to glyphosate between resistant and sensitive biotypes. Key words: Conyza sumatrensis, EPSPs, resistance, shikimic acidEfeito do glyphosate sobre parâmetros fisiológicos de buva RESUMO O objetivo do trabalho foi determinar alterações no processo fotossintético e na inibição da 5-enolpiruvilchiquimato-3-fosfato sintase (EPSPs), por meio do acúmulo de ácido chiquímico, após a aplicação do herbicida glyphosate, em quatro biótipos de C. sumatrensis coletados no Estado do Rio Grande do Sul. Para isto foram conduzidos experimentos em casa-de-vegetação e em laboratório avaliando fitomassa seca da parte aérea, taxa de fotossíntese, transpiração e eficiência do uso da água; a quantidade de ácido chiquímico foi calculada para cada tratamento. A aplicação do glyphosate reduziu o crescimento e afetou a taxa de fotossíntese a eficiência do uso da água dos biótipos de forma diferencial, sendo que o biótipo resistente teve pequena interferência do glyphosate enquanto os parâmetros fisiológicos do biótipo suscetível foram profundamente afetados pelo herbicida. Nos biótipos suscetíveis o acúmulo de ácido chiquímico foi maior que no biótipo resistente evidenciando sensibilidade diferencial da EPSPs dos biótipos resistente e sensíveis ao glyphosate. Palavras

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Glyphosate

Cited by 43 publications

References 56 publications

Pouteria torta: a native species of the Brazilian Cerrado as a bioindicator of glyphosate action

Pouteria torta: a native species of the Brazilian Cerrado as a bioindicator of glyphosate action

Glyphosate influence on the physiological parameters of Conyza bonariensis biotypes

Effect of glyphosate on the physiological parameters of horseweed

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