Mechanisms of glyphosate toxicity in velvetleaf (Abutilon theophrasti medikus)

Fuchs, Mark A.; Geiger, Donald R.; Reynolds, Tracey L.; Bourque, June E.

doi:10.1016/s0048-3575(02)00118-9

Cited by 51 publications

(49 citation statements)

References 38 publications

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“…ha -1 (S3) showed the higher value of Ic and this result was similar to the one found at 7 DAA. In Abutilon theophrasti medikus, Fuchs et al (2002) have shown that the reduction of stomatal conductance was accompanied by the reduction of Ic after application of glyphosate, which at 5 DAA reached zero -results contrary to those observed here. Concenço et al (2008) have observed that the biotype of resistant ryegrass, under competitive conditions, presented higher concentrations of CO 2 in the leaf mesophyll compared to the susceptible biotype, in an …”

Section: Cs Cr Cs Crcontrasting

confidence: 99%

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

et al. 2017

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-In Brazil, ryegrass (Lolium multiflorum) has been identified as resistant to glyphosate, becoming a major problem, especially in crops cultivated in the winter season. This herbicide can indirectly affect photosynthesis by inhibiting biosynthesis of many compounds. Thus, the aim of this study was to investigate the influence of glyphosate on the physiological profile of susceptible and resistant ryegrass populations to the herbicide. The experimental design was completely randomized with two treatments (720 and 1,080 g e.a. ha ) and four replications plus control with no treatment. Two ryegrass populations were sown, one susceptible and another one resistant to glyphosate. After the treatments, evaluations were carried out at 1, 3, 7 and 28 days after application (DAA). Variables analyzed were: CO 2 net assimilation rate, stomatal conductance, CO 2 internal concentration, transpiration, water use efficiency and instantaneous carboxylation efficiency. The glyphosate herbicide caused irreversible damage in a susceptible population which at 28 DAA in all variables analyzed this population was already dead and it was impossible to analyze it, but it was shown that the effects of this herbicide were intensified from the third day after application. In the case of the resistant population, at 3 DAA in all variables, it suffered significant effects comparing to the control, showing that even with a high level of resistance the herbicide can affect its metabolism. Keywords

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Section: Cs Cr Cs Crcontrasting

confidence: 99%

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

et al. 2017

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“…Coincidiendo con ello, Ribeiro et al (2008) hallaron que el glifosato provocó caídas en la fotosíntesis neta de plantas susceptibles de Lolium multiflorum y, conduciendo a valores de la mitad de las tasas registradas en plantas resistentes a 48 HPA. Fuchs et al (2002) demostraron que los niveles de 3-fosfoglicerato y ribulosa bifosfato carboxilasa son sensibles al tratamiento con glifosato y caen significativamente luego de las 24 h de aplicado. Los incrementos de azúca-res libres en las hojas serían responsables por la inhibición en la regeneración de ribulosa-1,5-bifosfato.…”

Section: (A) (B)unclassified

Efecto del glifosato sobre el crecimiento y acumulación de azúcares libres en dos biotipos de lolium perenne de distinta sensibilidad al herbicida

Yanniccari

Istilart²,

Giménez³

et al. 2012

Planta daninha

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El movimiento sistémico del glifosato está determinado por el transporte de fotoasimilados. A su vez, la capacidad de un destino de consumir los asimilados está condicionada por su actividad metabólica. Pese a su importancia, la relación entre el glifosato y la síntesis de azúcares en hojas fuente ha sido poco abordada. El objetivo del presente trabajo fue evaluar los efectos del glifosato sobre el crecimiento y la acumulación de azúcares libres en dos biotipos de Lolium perenne de baja y alta sensibilidad al herbicida. Se trabajó con clones de ambos tipos de plantas, en macollaje, tratados con 1.440 g e.a. ha-1 de glifosato y sin tratamiento herbicida como controles. Se evaluó periódicamente el efecto del glifosato sobre el rebrote de hojas hasta las 50 horas post-aplicación y sobre los niveles de azúcares libres totales, reductores y no reductores en hojas a 1, 2, 3 y 5 días post-aplicación. A partir de las 25 horas post-aplicación, el glifosato provocó una disminución del crecimiento del 58% en el biotipo susceptible, con una acumulación de azúcares libres superior al 90% con relación al control, desde el primer día post-aplicación en adelante. La inhibición del crecimiento, inducida por el glifosato en plantas susceptibles, no depende de la limitación del traslado de fotoasimilados desde la parte aérea. Por tanto, la acumulación de azúcares libres en hojas podría explicarse por la caída en la tasa de crecimiento. En el biotipo de baja sensibilidad, en el que no se detectó inhibición del crecimiento, estos efectos fueron limitados.

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“…The leaf abscission observed must have occurred probably due to the increase on the ethylene production through an indirect action of glyphosate (FUCHS et al, 2002;GRAVENA, 2006). According to Yamada and Castro (2007), ethylene increases the cellulase activity, which makes the leaves more susceptible to abscission, in addition to promoting the loss of chlorophyll; therefore, it is one of the factors responsible for the chlorosis.…”

Section: Resultsmentioning

confidence: 98%

MORPHOLOGICAL AND PHYSIOLOGICAL CHANGES ON Schizolobium parahyba VAR. Amazonicum (HUBER EX DUCKE) BARNEBY PLANTS INTOXICATED BY GLYPHOSATE

Pereira

Viana

Trindade

et al. 2017

CERNE

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ABSTRACT:The objective of this study was to evaluate the morphological and physiological changes in paricá plants (Schizolobium parahyba var. amazonicum) intoxicated by glyphosate. The experiment was conducted in a protected environment using paricá plants during their planting stage, which were intoxicated with increasing doses of glyphosate: 0 (control); 43.2; 86.2; 129.6 and 172.8 g . ha -1 . At 7 and 21 days after the application of the herbicide, the photosynthesis, transpiration, stomatal conductance and leaf temperature were measured. The visual intoxication degree and the growth of the shoot and the root of the plants were evaluated 21 days after the application. Paricá shows symptoms of visual intoxication characterized by chlorosis/winding, evolving to necrosis/abscission of the youngest leaflets. The growth of the stem and the roots of the intoxicated plants is preserved; however, an expressive leaf loss occurs, and paricá may have adaptation mechanisms to tolerate the action of the herbicide molecule. The photosynthesis decrease promoted by an indirect action of glyphosate represents the main reduction on the growth of plants. The decrease on the stomatal conductance, which was the most sensitive physiological variable to glyphosate, resulted in lower transpiration rates, which, consequently, caused increases on the leaf temperature. MODIFICAÇÕES MORFOLÓGICAS E FISIOLÓGICAS EM PLANTAS DE Schizolobium parahyba VAR. amazonicum (HUBER EX DUCKE) BARNEBY INTOXICADAS POR GLYPHOSATERESUMO: Objetivou-se avaliar as variações morfofisiológicas em plantas de paricá (Schizolobium parahyba var. amazonicum) intoxicadas por glyphosate. O experimento foi realizado em ambiente protegido utilizando plantas de paricá em idade de plantio, as quais foram intoxicadas com doses crescentes de glyphosate: 0 (testemunha); 43,2; 86,2; 129,6 e 172,8 g . ha -1 . Aos 7 e 21 dias após a aplicação do herbicida, foram realizadas medições da fotossíntese líquida, transpiração, condutância estomática e temperatura da folha. O grau de intoxicação visual e crescimento da parte aérea e da raiz das plantas foram avaliados aos 21 dias após a aplicação. O paricá manifesta sintomas de intoxicação visual caracterizados por clorose/enrolamento e evolução para necrose/abscisão dos foliolulos mais novos. O crescimento do caule e da raiz das plantas intoxicadas é conservado, contudo, há expressiva perda foliar, podendo o paricá possuir mecanismos de adaptação para tolerar a ação da molécula do herbicida. O decréscimo promovido na fotossíntese por ação indireta do glyphosate representa a principal causa da redução no crescimento das plantas. O decréscimo na condutância estomática, a qual demonstrou ser a variável fisiológica mais sensível ao glyphosate, resultou em menores taxas de transpiração, que, consequentemente, ocasionou elevações na temperatura da folha.

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Mechanisms of glyphosate toxicity in velvetleaf (Abutilon theophrasti medikus)

Cited by 51 publications

References 38 publications

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

Influence of Glyphosate on Susceptible and Resistant Ryegrass Populations to Herbicide

Efecto del glifosato sobre el crecimiento y acumulación de azúcares libres en dos biotipos de lolium perenne de distinta sensibilidad al herbicida

MORPHOLOGICAL AND PHYSIOLOGICAL CHANGES ON Schizolobium parahyba VAR. Amazonicum (HUBER EX DUCKE) BARNEBY PLANTS INTOXICATED BY GLYPHOSATE

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