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Quinclorac Absorption and Translocation Characteristics in Quinclorac- and Propanil-Resistant and -Susceptible Barnyardgrass (Echinochloa crus-galli) Biotypes

Published online by Cambridge University Press:  20 January 2017

M.L. Lovelace ,
R.E. Talbert ,
R.E. Hoagland  and
E.F. Scherder
M.L. Lovelace*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 W. Altheimer Drive, Fayetteville, AR 72704
R.E. Talbert
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 W. Altheimer Drive, Fayetteville, AR 72704
R.E. Hoagland
Affiliation:
USDA-ARS, Southern Weed Science Research Unit, P.O. Box 350, Stoneville, MS 38776-0350
E.F. Scherder
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 W. Altheimer Drive, Fayetteville, AR 72704
*
Corresponding author's E-mail: michael.lovelace@usda.gov
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Abstract

Studies were initiated to evaluate absorption, translocation, and distribution of 14C-quinclorac in propanil- and quinclorac-resistant (R-BYG) and -susceptible (S-BYG) barnyardgrass. No differential absorption of 14C-quinclorac was observed between R-BYG and S-BYG, but more 14C remained in the treated leaf of S-BYG (57% of total absorbed) compared with the R-BYG leaf (34% of total absorbed) at 72 h after treatment (HAT). After 12 HAT, 20 and 15% of the amount absorbed had been translocated basipetally by R-BYG and S-BYG, respectively. At 72 HAT, 27 and 17% of the total absorbed 14C had been translocated acropetally by R-BYG and S-BYG, respectively. The levels of 14C above the treated leaf continued to increase throughout the duration of the experiment in R-BYG while levels of 14C above the treated leaf in S-BYG remained relatively constant. Seven percent more of the total absorbed 14C was exuded from roots of R-BYG than S-BYG at 72 HAT. Although differential translocation was observed between R-BYG and S-BYG, it is unclear whether this difference is a cause of quinclorac resistance or an effect of some other physiological process. Further research is needed to determine if differential translocation is due to metabolism or other physiological factors.

Keywords

Quincloracbarnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCGAuxin herbicideauxinic herbicidedifferential translocationherbicide resistance
Type
Research
Information
Weed Technology , Volume 21 , Issue 3 , September 2007 , pp. 683 - 687
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Agronomist, USDA, Agriculture Marketing Service, Livestock and Seed Program, Seed Regulatory and Testing Branch, 801 Summit Crossing Place, Suite C, Gastonia, NC 28054.
Current address: Agronomist, AgriGold Hybrids, RR1 Box 203, St. Francisville, IL 62460-9989.

References

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