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1 July 2007 Quinclorac Absorption and Translocation Characteristics in Quinclorac- and Propanil-resistant and -susceptible Barnyardgrass (Echinochloa Crus-galli) Biotypes
M.L. Lovelace, R.E. Talbert, R.E. Hoagland, E.F. Scherder
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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.

Nomenclature: Quinclorac, barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCG

M.L. Lovelace, R.E. Talbert, R.E. Hoagland, and E.F. Scherder "Quinclorac Absorption and Translocation Characteristics in Quinclorac- and Propanil-resistant and -susceptible Barnyardgrass (Echinochloa Crus-galli) Biotypes," Weed Technology 21(3), 683-687, (1 July 2007). https://doi.org/10.1614/WT-06-060.1
Received: 27 March 2006; Accepted: 1 February 2007; Published: 1 July 2007
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