Basis for the Differential Response of Quackgrass (Elytrigia repens) Biotypes to Primisulfuron

Gillespie, Greg R.

doi:10.1017/s0043174500084083

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…Plants were not presprayed with commercial glyphosate before application of 14 C-glyphosate to minimize stress during the exposure period. Furthermore, pretreated (Camacho and Moshier 1991) and nontreated (Gillespie 1994) plants have produced similar absorption and translocation trends when radiolabeled herbicides were spotted on the leaves.…”

Section: C-glyphosate Absorption and Translocation Studymentioning

confidence: 91%

Role of absorption and translocation in the mechanism of glyphosate resistance in horseweed (Conyza canadensis)

Koger¹,

2005

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Greenhouse and laboratory experiments were conducted to investigate mechanisms of glyphosate resistance in horseweed populations from Mississippi, Arkansas, Delaware, and Tennessee. A nondestructive leaf-dip bioassay was developed to confirm resistance and susceptibility in individual test plants. A single leaf was excised from each plant, and the petiole and bottom one-fourth of leaf was dipped in a 600 mg ae L−1 glyphosate solution for 2 d followed by visually estimating the injury on a scale of 0 to 10. Plants were classified as resistant (R) if the score was 2 to 3 and susceptible (S) if the score was 5 to 6. 14C-glyphosate solution was applied on the adaxial surface of a fully expanded leaf of the second whorl of four-whorl rosette plants. Plants were harvested 48 h after treatment and radioactivity was determined in treated leaf, other leaves, crown, and roots. Absorption of 14C-glyphosate was similar (47 to 54%) between R and S plants from within and among the four states, suggesting absorption is not involved in glyphosate resistance. The amount of radioactivity translocated from the treated leaf was reduced in R plants compared with S plants. The reduction in translocation of 14C-glyphosate ranged from 28% in Mississippi-R biotype to 48% in Delaware-R biotype compared with their respective S biotypes. Epicuticular wax mass ranged from 6 to 80 μg cm−2 among horseweed biotypes, with no differences between R and S biotypes within each state. Treating two leaves with glyphosate solution at the field use rate (0.84 kg ae ha−1) killed S plants but not R plants (38 to 58% control) regardless of state origin. These results suggest that a simple bioassay can be used to screen biotypes for suspected resistance and that reduced translocation of glyphosate plays a major role in glyphosate resistance in R biotypes of horseweed.

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Section: C-glyphosate Absorption and Translocation Studymentioning

confidence: 91%

Role of absorption and translocation in the mechanism of glyphosate resistance in horseweed (Conyza canadensis)

Koger¹,

2005

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“…Plants were not sprayed with nonradiolabeled herbicide in these experiments. Both pretreated (Camacho and Moshier 1991) and nontreated (Gillespie 1994) plants have produced similar absorption and translocation trends when radiolabeled sulfonylurea herbicides were spotted on the leaves. We chose not to spray plants with the nonradiolabeled herbicide to avoid dilution effects where the nonlabeled herbicide competes with the radioactive compound for the active sites.…”

Section: Absorption and Translocationmentioning

confidence: 97%

Absorption, translocation, and metabolism of foliar-applied CGA 362622 in cotton, peanut, and selected weeds

Askew

Wilcut²

2002

Weed Science

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Studies were conducted to evaluate absorption, translocation, and metabolism of 14C-CGA 362622 when foliar applied to cotton, peanut, jimsonweed, and sicklepod. Differential metabolism is the basis for tolerance in cotton and jimsonweed. In addition, cotton absorbs less herbicide compared with the other three species, thus aiding in tolerance. Only jimsonweed translocated appreciable herbicide (25%) out of treated leaves and acropetally to the meristematic tissue where the herbicide was quickly metabolized. No plant species translocated over 2% of applied radioactivity below the treated leaves. Most of the metabolites formed by the four species were more polar than CGA 362622 and averaged 51, 48, 30, and 25% of the radioactivity detected in the treated leaves of cotton, jimsonweed, peanut, and sicklepod, respectively. The half-life of CGA 362622 was estimated to be 0.8, 1.9, 4, and 6 d in treated leaves of cotton, jimsonweed, sicklepod, and peanut, respectively.

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“…Plants were not presprayed with formulated trifloxysulfuron before application of 14 C-trifloxysulfuron to minimize stress during the exposure period. Pretreated (Camacho and Moshier 1991) and nontreated (Gillespie 1994) plants have produced similar absorption and translocation trends when sulfonylurea herbicides were spotted on the leaves.…”

Section: Plant Materialsmentioning

confidence: 93%

Spray carrier pH effect on absorption and translocation of trifloxysulfuron in Palmer amaranth (Amaranthus palmeri) and Texasweed (Caperonia palustris)

et al. 2006

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Spray carrier pH affects the solubility of sulfonylurea herbicides and, therefore, could affect absorption and subsequent translocation of these compounds in weeds. Trifloxysulfuron is a sulfonylurea herbicide developed for POST weed control in cotton, sugarcane, and turfgrass with a pKa of 4.81. The objective of this study was to evaluate the absorption and translocation of foliar-applied 14C-trifloxysulfuron in Palmer amaranth and Texasweed at pH 5, 7, and 9 over a period of 4 to 72 h after treatment (HAT). For absorption, effects of time, species, and pH were significant. Absorption averaged over species and pH increased logarithmically from 4 to 72 HAT. Absorption was greater for Palmer amaranth (88%) than for Texasweed (29%) when averaged over time and pH. Absorption averaged over species and time increased in the order of pH 5 (52%) < pH 9 (60%) = pH 7 (61%). Consequently, this translated into greater translocation of 14C-trifloxysulfuron in Texasweed when sprayed with the higher pH spray solutions. These data indicate that absorption and translocation of trifloxysulfuron in some weed species may be enhanced by increasing the pH of the spray solution by 2 pH units above the pKa.

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Basis for the Differential Response of Quackgrass (Elytrigia repens) Biotypes to Primisulfuron

Cited by 8 publications

References 12 publications

Role of absorption and translocation in the mechanism of glyphosate resistance in horseweed (Conyza canadensis)

Role of absorption and translocation in the mechanism of glyphosate resistance in horseweed (Conyza canadensis)

Absorption, translocation, and metabolism of foliar-applied CGA 362622 in cotton, peanut, and selected weeds

Spray carrier pH effect on absorption and translocation of trifloxysulfuron in Palmer amaranth (Amaranthus palmeri) and Texasweed (Caperonia palustris)

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