Penetration, Translocation, and Metabolism of Acifluorfen Following Pretreatment with Mefluidide

Abstract

The penetration, translocation, and metabolism of acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid} in ivyleaf morningglory [Ipomoea hederacea(L.) Jacq. ♯3IPOHE], velvetleaf (Abutilon theophrastiMedic. ♯ ABUTH), common cocklebur (Xanthium pensylvanicumWallr. ♯ XANPE), and soybean [Glycine max(L.) Merr.] were studied. An application to plants of 0.3 kg ai/ha mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamide} 0, 3, 5, or 7 days prior to treatment with14C-acifluorfen often altered one or more of the physiological processes under study. Pretreatment of ivyleaf morningglory with mefluidide 3, 5, or 7 days prior to application of14C-acifluorfen increased penetration of14C and decreased metabolism of acifluorfen, while translocation was unaffected. All mefluidide treatments increased penetration of14C-acifluorfen into velvetleaf, while the 3-, 5-, and 7-day pretreatments decreased acifluorfen metabolism. Penetration of acifluorfen into common cocklebur was unaffected by pretreatment with mefluidide. However, the 7-day mefluidide pretreatment of common cocklebur increased translocation of14C into the upper leaves and decreased acifluorfen metabolism. Penetration and translocation of the radiolabel from14C-acifluorfen in soybean was unaffected by pretreatment with mefluidide. Metabolism of acifluorfen by soybean was decreased by the 0-day mefluidide treatment but was unaffected by the 3-, 5-, or 7-day mefluidide pretreatment.

Absorption and Translocation of Foramsulfuron in Dallisgrass (Paspalum dilatatum) Following Preapplication of MSMA

“…Translocation in barley (Hordeum vulgare L.) and wheat was greater at 6 h after treatment (15 and 10%), respectively, but decreased over time (24 to 96 h), staying at 3.9% in barley and ranging from 4.1 to 8.5% in wheat. Translocation in Italian ryegrass increased over time to 9.4% at 96 h. Hook and Glenn (1984) observed that translocation of 14 C-acifluorfen in common cocklebur increased, with 1.3 or 1.6% of the amount applied found above or below the treated leaf, respectively, with acifluorfen alone and 4.6 or 4.3%, respectively, when mefluidide was applied 7 d earlier.…”

“…Other studies have documented changes in herbicide absorption as a result of earlier herbicide applications. Hook and Glenn (1984) observed an increase in absorption (36, 57, and 50%) of acifluorfen when common cocklebur (Xanthium pensylvanicum Wallr.) received a mefluidide application 3, 5, or 7 d before 14 C-acifluorfen application, respectively.…”

Modeling Xenobiotic Uptake and Movement: A Review

“…In some instances the model predicted more than 3 times the amount of xenobiotic absorbed in comparison to the actual absorption. The model predictions of absorption were overestimated for herbicides such as acifluorfen (135), imazaquin (145), imazethapyr (147), nicosulfuron (150), prosulfuron (152),sethoxydim (153) and Halosulfuron (154). These overestimations of xenobiotic absorption represent only 14% of the simulations ( Table 3).…”

Peace Research

“…), na Europa (a tradição marxiana etc. ), no Japão (Hook;Kan, 1983) e noutros lugares começaram a identificar-se como sendo investigação para a paz e a marcar presença em associações, revistas e congressos. Esta natureza dupla do processo de crescimento teve consequências importantes.…”