Physiological Basis for Differential Sensitivity to Sulfentrazone by Sicklepod (<i>Senna obtusifolia</i>) and Coffee Senna (<i>Cassia occidentalis</i>)

Dayan, Franck E.; Weete, John D.; Hancock, H. Gary

doi:10.1017/s0043174500093486

Cited by 51 publications

(73 citation statements)

References 23 publications

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“…The presence of this compound is the evidence that some microbial degradation is occurring in the soil and that either fungi or bacteria can metabolize the herbicide. The formation of this derivative is known to be achieved through a stepwise oxidation of the triazolinone ring methyl group of the parent molecule, and it is known to be less toxic than sulfentrazone (Dayan et al, 1996(Dayan et al, , 1998 with respect to its biological activity (Theodorides et al, 1992). The metabolisms of sulfentrazone in animals and plants are similar; the major plant metabolite being 3-hydroxymethyl sulfentrazone (HMS).…”

Section: Discussionmentioning

confidence: 99%

The effects of moisture and temperature on the degradation of sulfentrazone

Martinez¹,

Silva²,

Fay³

et al. 2008

Geoderma

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This study examined the degradation of sulfentrazone in Arenic Hapludult soil, such soil being representative of regions where sulfentrazone is used in Brazil. Soil samples were supplemented with the herbicide [0.7 µg active ingredient (a.i.) g − 1 soil] and maintained at 27°C. The soil moisture content was corrected to 30, 70 or 100% of water holding capacity (WHC). Herbicide-free soil samples were used as controls. Aliquots were taken after 14, 30, 60, 120, 180 and 255 days of incubation for the quantitative analysis of sulfentrazone residues by gas chromatography. Another experiment was conducted using soil samples with and without herbicide, submitted to different temperatures of 15, 30 and 40°C, and kept at a constant value for WHC of 70% . The sulfentrazone residues were quantified by gas chromatography after 14, 30, 60 and 120 days of incubation. The potential degrader microorganisms were isolated and identified. A half-life of 172.4 days was estimated at 27°C and 70% WHC. The microorganisms identified as potential degraders of the herbicide were Acinetobacter calcoaceticus, Chrysosporium sp., Eupenicillium sp., Metarhizium sp. and Paecilomyces sp. After 120 days, temperature had no further effect (P b 0.16) on sulfentrazone degradation, and the soil moisture content had no effect on degradation at any time.

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Section: Discussionmentioning

confidence: 99%

The effects of moisture and temperature on the degradation of sulfentrazone

Martinez¹,

Silva²,

Fay³

et al. 2008

Geoderma

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“…Similar results were reported by Thomas et al (2005) in peanut and prickly sida (sulfentrazone-tolerant and -susceptible species, respectively). Dayan et al (1996) also reported that sulfentrazone-tolerant and -susceptible weed species did not differ in root uptake of sulfentrazone. Therefore, the uptake and translocation of sulfentrazone observed in tobacco was consistent with other research and is apparently not the mechanism of tolerance in tobacco.…”

Section: Resultsmentioning

confidence: 89%

Uptake, Translocation, and Metabolism of Root Absorbed Sulfentrazone and Sulfentrazone plus Clomazone in Flue-Cured Tobacco Transplants

Fisher¹,

Burke²,

Price³

et al. 2006

Weed technol.

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Research was conducted to evaluate root uptake, translocation, and metabolism of14C-sulfentrazone alone or in a mixture with clomazone in solution in flue-cured tobacco transplants. Uptake and translocation of sulfentrazone was rapid and was not affected by the addition of clomazone. Fifty-nine and 65% of the14C absorbed by the plant was translocated to the leaves within 24 h with sulfentrazone alone and in the clomazone plus sulfentrazone mixture, respectively. Differences in plant metabolism were observed between sulfentrazone alone and sulfentrazone plus clomazone. After 3 h, 66% of the14C recovered from the leaves was metabolized when sulfentrazone was applied alone, compared to 91% when sulfentrazone was applied with clomazone. The difference could indicate that metabolism of sulfentrazone by tobacco transplants was enhanced by the presence of clomazone.

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“…In treatments with M, M was added at 0.5% (v/v). Treatments were applied as 10 Table 1), on the biomass of conventional canola. Data are expressed as a percent of untreated controls.…”

Section: Resultsmentioning

confidence: 99%

Bases for Interactions between Saflufenacil and Glyphosate in Plants

Ashigh

Hall

2010

J. Agric. Food Chem.

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Buckwheat (Fagropyrum esculentum Moench.), cabbage (Brassica oleracea L), and conventional and glyphosate-resistant varieties of canola (Brassica napus L.) were used to study the bases of saflufenacil and glyphosate interactions. Compared to the addition of Merge (surfactant), the addition of both Transorb (i.e., commercial product, Transorb formulation with glyphosate) and Merge increased the cuticular absorption of [(14)C] saflufenacil in cabbage plants with thick epicuticular wax layers. However, in all cases, the addition of glyphosate reduced the translocation of [(14)C]saflufenacil in glyphosate-susceptible plants, while translocation was not affected in glyphosate-resistant canola. Moreover, the phytotoxicity of saflufenacil reduced the activity of glyphosate, possibly by reducing its translocation in all plant species studied. Increased absorption of saflufenacil by the addition of Transorb (i.e., Transorb formulation with glyphosate) plus Merge appears to increase its contact activity, thus the interaction of saflufenacil and glyphosate involves two separate processes, absorption and translocation.

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Physiological Basis for Differential Sensitivity to Sulfentrazone by Sicklepod (Senna obtusifolia) and Coffee Senna (Cassia occidentalis)

Cited by 51 publications

References 23 publications

The effects of moisture and temperature on the degradation of sulfentrazone

The effects of moisture and temperature on the degradation of sulfentrazone

Uptake, Translocation, and Metabolism of Root Absorbed Sulfentrazone and Sulfentrazone plus Clomazone in Flue-Cured Tobacco Transplants

Bases for Interactions between Saflufenacil and Glyphosate in Plants

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