Reduced Translocation Is the Cause of Antagonism of Glyphosate by MSMA in Browntop Millet (<i>Brachiaria ramosa</i>) and Palmer Amaranth (<i>Amaranthus palmerii</i>)

Burke, Ian C.; Koger, Clifford H.; Reddy, Krishna N.; Wilcut, John W.

doi:10.1614/wt-06-064.1

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…At this growth stage, meristematic regions for shoot and root growth in giant foxtail are very close physically. Similar translocation patterns of glyphosate have been observed in other grass species such as browntop millet [ Urochloa ramosa (L.) Nguyen] and barnyardgrass (Burke et al 2007; Kirkwood et al 2000).…”

Section: Resultssupporting

confidence: 68%

Reduced Translocation Is Associated with Antagonism of Glyphosate by Glufosinate in Giant Foxtail (Setaria faberi) and Velvetleaf (Abutilon theophrasti)

2018

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Previous reports have underscored antagonism that may result from mixing glyphosate and glufosinate across a wide range of application rates and for various broadleaf and grass weed species, but no investigation has been conducted to characterize glyphosate absorption and translocation when combined with glufosinate. The objectives of this study were to evaluate herbicide efficacy and assess herbicide interaction and physiological response with combinations of glyphosate and glufosinate on common lambsquarters, velvetleaf, and giant foxtail. Greenhouse studies to determine interaction resulted in strong and persistent antagonism between glyphosate at 110 and 220 g ae ha−1and glufosinate at 20 or 40 g ae ha−1in giant foxtail, whereas only transient and reduced antagonism was noted for velvetleaf and common lambsquarters. Combining glyphosate and glufosinate increased the maximum absorption of glyphosate by 9% and 23% in velvetleaf and giant foxtail, respectively, compared with glyphosate alone. In velvetleaf, averaged over time, only 2.6% of the applied radioactivity translocated out of the treated leaf when glufosinate was mixed with glyphosate compared with 9.9% when glyphosate was applied alone. In giant foxtail, 21.6% of the [14C]glyphosate translocated out of the treated leaf when glufosinate was mixed with glyphosate compared with 52.4% when glyphosate was applied alone. Conversely, no change in the radioactive pattern of translocation was noted for common lambsquarters. These results suggest that reduced translocation of glyphosate is the physiological mechanism responsible for the antagonism observed between glyphosate and glufosinate in giant foxtail and, to a lesser extent, in velvetleaf.

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Section: Resultssupporting

confidence: 68%

Reduced Translocation Is Associated with Antagonism of Glyphosate by Glufosinate in Giant Foxtail (Setaria faberi) and Velvetleaf (Abutilon theophrasti)

2018

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“…The C1B1 biotype absorbed similar levels of glyphosate (35 to 39% of applied), irrespective of herbicide treatment or harvest time. Burke et al (2007) recorded 57% (of applied) 14 Cglyphosate absorption in Palmer amaranth 48 HAT. Culpepper et al (2006) reported similar levels of absorption of glyphosate between resistant and susceptible biotypes.…”

Section: Control Bmentioning

confidence: 95%

Multiple Resistance to Glyphosate and Pyrithiobac in Palmer Amaranth (Amaranthus palmeri) from Mississippi and Response to Flumiclorac

et al. 2012

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Greenhouse and laboratory studies were conducted to confirm and quantify glyphosate resistance, quantify pyrithiobac resistance, and investigate interaction between flumiclorac and glyphosate mixtures on control of Palmer amaranth from Mississippi. The GR50(herbicide dose required to cause a 50% reduction in plant growth) values for two glyphosate-resistant biotypes, C1B1 and T4B1, and a glyphosate-susceptible (GS) biotype were 1.52, 1.3, and 0.09 kg ae ha−1glyphosate, respectively. This indicated that the C1B1 and T4B1 biotypes were 17- and 14-fold resistant to glyphosate, respectively, compared with the GS biotype. The C1B1 and T4B1 biotypes were also resistant to pyrithiobac, an acetolactate synthase (ALS) inhibitor, with GR50values of 0.06 and 0.07 kg ai ha−1, respectively. This indicated that the C1B1 and T4B1 biotypes were 7- and 8-fold, respectively, more resistant to pyrithiobac compared with the GS biotype, which had a GR50value of 0.009 kg ha−1. Flumiclorac was antagonistic to glyphosate by reducing glyphosate translocation. The C1B1 and T4B1 absorbed less glyphosate 48 h after treatment (HAT) compared with the GS biotype. The majority of the translocated glyphosate accumulated in the shoot above the treated leaf (that contains the apical meristem) in the GS biotype and in the shoot below the treated leaf in the resistant biotypes, C1B1 and T4B1, by 48 HAT. The C1B1 biotype accumulated negligible shikimate levels, whereas the T4B1 and GS biotypes recorded elevated levels of shikimate. Metabolism of glyphosate to aminomethylphosphonic acid was not detected in either of the resistant biotypes or the susceptible GS biotype. The above results confirm multiple resistance to glyphosate and pyrithiobac in Palmer amaranth biotypes from Mississippi and indicate that resistance to glyphosate is partly due to reduced absorption and translocation of glyphosate.

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“…Only 0.08 and 1.89% of the glyphosate translocated by brachiaria went to the roots of the weed, when associated to sugarcane and citrus, respectively, at 12 days after the application (Figures 2 and 3, respectively). In another Urochloa species, such as U. ramosa, only 10.8% of the applied radioactivity was translocated from the treated leaf to the rest of the plant (including the root) when glyphosate was applied in isolation 72 hours after treatment (Burke et al, 2007). These results show the small amount of the herbicide that reaches the root system of brachiaria.…”

Section: Resultsmentioning

confidence: 91%

Translocation and Root Exudation of Glyphosate by Urochloa brizantha and its Transport on Sugarcane and Citrus Seedlings

Viti

Alves²,

Mendes

et al. 2019

Planta daninha

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Glyphosate is easily exuded by the roots of plants. However, there is still some lack of information in the scientific literature as to whether Urochloa brizantha is capable of exuding glyphosate to influence the growth of crops such as sugarcane and citrus. Thus, the objective of this research was to evaluate the translocation and root exudation of 14 C-glyphosate by U. brizantha and its transport in sugarcane and citrus. Sugarcane seedlings, varieties SP80-1842, and citrus 'Limão Rosa' (Citrus limonia L. Osbeck) were cultivated with U. brizantha around the seedlings. Using a microsphere, 14 C-glyphosate was applied on the leaves of U. brizantha. The plants were cultured for 12 days after treatment (DAT). The radioactivity of the herbicide was evaluated by liquid scintillation spectrometer, after oxidizing the soil and parts of the plants (leaves, culms and roots) of U. brizantha, sugarcane and citrus. The highest amount of glyphosate was detected in the U. brizantha leaves, where the applications were carried out, regardless of the culture studied. Only traces of glyphosate (0.001%) were detected in soil cultivated with sugarcane. On the other hand, in citrus, U. brizantha exuded 9.46% of the glyphosate by the root system in the soil. The total amount of herbicide found in sugarcane and citrus seedlings was only 0.006 and 0.095%, respectively, in all parts of the plant. These concentrations are lower than those required to cause intoxication in those crops. Considering the results, it is possible to state that the translocation of glyphosate in young plants of U. brizantha associated with citrus was higher in relation to sugarcane, and it was not exuded by the root system of the weed with sugarcane, but presented root exudation with citrus, however, the amount did not reach what is necessary to affect the dry mass of the agricultural crops.Keywords: behavior in the plant, radioisotope, chemical sensitivity. RESUMO-O glyphosate é facilmente exsudado pelas raízes das plantas. No entanto, ainda falta informação na literatura científica sobre a braquiária (Urochloa brizantha) é capaz de exsudar o glyphosate a ponto de influenciar o crescimento de culturas, como cana-de-açúcar e citros. Assim, o objetivo desta pesquisa foi avaliar a translocação e exsudação radicular do 14 C-glyphosate por U. brizantha e seu transporte em mudas de cana-de-açúcar e citros. Foram cultivadas mudas de cana-de-açúcar, variedade SP80-1842, e citros 'Limão Rosa' (Citrus limonia L. Osbeck) com a braquiária ao redor das mudas. Utilizando uma microsseringa, foi aplicado 14 C-glyphosate nas folhas de braquiária. As plantas foram cultivadas por 12 dias após o tratamento (DAT). A radioatividade do herbicida foi avaliada por espectrômetro de cintilação líquida, depois de oxidado o solo e as partes das Planta Daninha 2019; v37:e019183334 VITI, M.L. et al. Translocation and root exudation of glyphosate by Urochloa brizantha and its transport on sugarcane ...2 plantas (folhas, colmos e raízes) de braquiária, cana-de-açúcar e citros. A maior quantida...

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Reduced Translocation Is the Cause of Antagonism of Glyphosate by MSMA in Browntop Millet (Brachiaria ramosa) and Palmer Amaranth (Amaranthus palmerii)

Cited by 8 publications

References 13 publications

Reduced Translocation Is Associated with Antagonism of Glyphosate by Glufosinate in Giant Foxtail (Setaria faberi) and Velvetleaf (Abutilon theophrasti)

Reduced Translocation Is Associated with Antagonism of Glyphosate by Glufosinate in Giant Foxtail (Setaria faberi) and Velvetleaf (Abutilon theophrasti)

Multiple Resistance to Glyphosate and Pyrithiobac in Palmer Amaranth (Amaranthus palmeri) from Mississippi and Response to Flumiclorac

Translocation and Root Exudation of Glyphosate by Urochloa brizantha and its Transport on Sugarcane and Citrus Seedlings

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