p-Hydroxyphenylpyruvate dioxygenase is a herbicidal target site for β-triketones from Leptospermum scoparium

Dayan, Franck E.; Duke, Stephen O.; Sauldubois, Audrey; Singh, Nidhi; McCurdy, Christopher R.; Cantrell, Charles L.

doi:10.1016/j.phytochem.2007.01.026

Cited by 111 publications

(100 citation statements)

References 34 publications

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“…This herbicide inhibits the activity of 4-hydroxyphenylpyruvate dioxygenase (4-HPPD, EC 1.13.11.27), an enzyme catalyzing the catabolism of the common to essentially all aerobic forms of life amino acid tyrosine (Moran, 2005). Inhibition of the activity of 4-HPPD disrupts the biosynthesis of carotenoid pigments in susceptible plants, thus resulting in bleaching (chlorophyll loss) of the foliage, cessation of growth, and ultimately death of the treated plants (Dayan et al, 2007). Maize tolerance to topramezone is due to rapid metabolism of the herbicide to non-active substances and also due to a lower sensitivity of the target site enzyme (Grossmann & Ehrhardt, 2007).…”

Section: Introductionmentioning

confidence: 99%

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Damalas

Gitsopoulos²,

Koutroubas

et al. 2015

Planta daninha

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Panicoid grasses are major weeds of maize and sugarcane as well as of several other important grains, including sorghum, pearl millet, and foxtail millet. Pot trials were conducted to study the activity and potential interactions of topramezone in mixture with recommended rates of rimsulfuron or nicosulfuron on three annual panicoid grasses (i.e. Echinochloa oryzoides,E.phyllopogon, and Panicum miliaceum). Target weeds were treated at the four- to five-leaf growth stage. On the basis of fresh weight reduction, topramezone alone provided 78% control of E.oryzoides, 68% control of E.phyllopogon, and 99% control of P.miliaceum. Topramezone plus rimsulfuron or nicosulfuron provided decreased control of both Echinochloa spp. compared with topramezone alone. The decreased control of E.oryzoidesand E.phyllopogon was more pronounced with rimsulfuron as a companion herbicide in the mixtures. Slightly decreased control of P.milaceum was observed with topramezone plus rimsulfuron compared with topramezone alone, but this was not the case for topramezone plus nicosulfuron. Increased topramezone rates mixed with rimsulfuron or nicosulfuron did not improve control of E.oryzoides and E.phyllopogon compared with the lowest topramezone rate. Also, increased topramezone rates mixed with rimsulfuron or nicosulfuron showed decreased control of both Echinochloa spp. when compared with either rimsulfuron or nicosulfuron alone, suggesting a two-way interaction between topramezone and the ALS-inhibiting herbicides. The above-mentioned interaction was not observed in P.miliaceum, probably related with species sensitivity to the herbicides tested. Newly introduced or naturalized panicoid grasses in maize fields may complicate selection of companion herbicides and rates for effective weed control.

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Section: Introductionmentioning

confidence: 99%

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Damalas

Gitsopoulos²,

Koutroubas

et al. 2015

Planta daninha

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“…These symptoms are evident and characteristic because clomazone acts on the inhibition of carotenoid biosynthesis, reducing the ability of 5 these compounds to dissipate the excess of energy in the aerial part of plants (Dayan et al, 2007). Dan Hess (2000) reports that these pigments are essential in energy dissipation and, when excessive, they may cause the destruction of chlorophyll molecules by oxidation reactions.…”

Section: Resultsmentioning

confidence: 99%

Clomazone Leaching Estimate in Soil Columns Using the Biological Method

et al. 2017

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-The chemical control of weed is a necessary practice in large-scale agriculture. However, when herbicides are used in the wrong way, they can remain into soil for long periods and/or be leached in its profile, and they may even contaminate groundwater. In this research, clomazone leaching in soil samples collected from different Brazilian regions was estimated by biological method. To do so, columns containing soils were used, and samples were collected every 5 cm. After preparing columns and applying a 1,500 g a.i. ha -1 clomazone dose, rain simulation was performed. Sorghum was used in order to detect the herbicide. More than 60% similarity was found for the studied variables; it was chosen to use only data referring to toxicity percentage. Clomazone did not cause reduction in sorghum cultivated in Organosol, thus indicating a strong herbicide sorption in this soil. Increased pH in Oxisol reduced leaching. More rainfall caused increased herbicide leaching in Oxisol (pH 5.1) and Quartzarenic Neosol. The highest leaching occurred in soils with lower pH and lower organic matter content. It is possible to conclude that, in soils with higher organic matter content, clomazone has lower risks of being leached.Keywords: herbicide, mobility in soil, environmental impact. RESUMO -O controle químico das plantas daninhas é prática consolidada na

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“…La leptospermona, tricetona más abundante de este aceite, provoca el blanqueo de las hojas de arvenses tanto de hoja ancha como de hoja estrecha (Knudsen et al, 2000). Las tricetonas naturales tienen una estructura similar a algunos herbicidas sintéticos, como sulcotrione y mesotrione, y actúan sobre la p-hidroxifenilpiruvato dioxigenasa (Lee et al, 1997;Dayan et al, 2007).…”

Section: Potencial Herbicida De Aceites Esencialesunclassified

Fitotoxicidad De Aceites Esenciales Y Extractos Acuosos De Plantas Mediterráneas Para El Control De Arvenses

Sancho¹,

Mercedes²

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p-Hydroxyphenylpyruvate dioxygenase is a herbicidal target site for β-triketones from Leptospermum scoparium

Cited by 111 publications

References 34 publications

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Clomazone Leaching Estimate in Soil Columns Using the Biological Method

Fitotoxicidad De Aceites Esenciales Y Extractos Acuosos De Plantas Mediterráneas Para El Control De Arvenses

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