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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | McCarty, L. B.;
Corbin, F. T.;
Higgins, J. M. |
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| Author Affiliation: | University of Florida, Gainesville, FL., N.C. State University, Raleigh, N.C., and Monsanto Chemical Co. Hays, KN.; respectively |
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| Title: | Sethoxydim Absorption, Translocation, and Metabolism in Centipedegrass and Goosegrass. |
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| Meeting Info.: | Held: January 18-20, 1988, Tulsa, OK. |
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| Source: | Southern Weed Science Society Proceedings. Vol. 41, January 1988, p. 122. |
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| Publishing Information: | Nashville, TN: Southern Weed Science Society. |
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| Keywords: | TIC Keywords: Sethoxydim; Adsorption; Translocation; Metabolism; Eremochloa ophiuroides; Eleusine indica
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| Abstract/Contents: | "Sethoxydim [2-1(ethoxyimino)-5-(2-ethylthio)propyl -3-hydroxy-2-cyclohexen-1-one] is a foliarly applied, systemic herbicide that selectively controls many monocotyledonous weeds. Centipedegrass (Eremochloa ophiuroides), a widely utilized fine-lawn turf species in southern states, is tolerant of sethoxydim, while goosegrass (Eleusine indica) is not. Research was therefore undertaken with the objective of determining the fate of 14C-sethoxydim in the differential responses of these grass species. 14C-sethoxydim was applied on the adaxial side of the 2nd leaf of 4 leaf stage centipedegrass and 3rd leaf of 6 leaf stage goosegrass. Plants were harvested 2 and 6 h after application and sectioned into 4 components: treated leaf, shoots above treated leaf, below treated leaf, and roots. External 14C was extracted by washing the 14C treated areas in water and then in chloroform. Internal 14C was extracted according to established procedures for sethoxydim and assayed for radioactivity by LSS and translocation by X-ray photography. To quantify metabolites, extracts were chromatographed with 14C-sethoxydim on TLC plates and developed to a 15 cm solvent front in a chloroform:methyl alcohol:water (65:25:4 v/v) solvent system. Three replications were used for each treatment and the experiment was repeated. Three times more 14C-sethoxydim remained in the goosegrass leaf water wash 2 h after application compared to the centipedegrass, suggesting that sethoxydim-tolerant centipedegrass does not selectively prevent herbicide absorption. The sethoxydim-sensitive goosegrass apparently adsorbs sethoxydim much more slowly than does centipedegrass. Greater amounts of 14C herbicide were found throughout plant fractions of centipedegrass versus goosegrass 2 and 6 h after treatment except in roots 6 h after treatment. Autoradiographs showed extensive translocation of 14C-sethoxydim throughout both grass species, with accumulation in the roots. Thin layer chromatography of the plant fractions indicated sethoxydim remained in parent form in goosegrass, whereas in centipedegrass, only trace amounts of parent sethoxydim were found. Evidently, sethyoxdim is absorbed and translocated throughout both plant species, but centipedegrass metabolizes it into a non-phytotoxic material, therefore, tolerance is observed." |
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| Language: | English |
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| References: | 0 |
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| See Also: | This publication is part of a reprint binder; search as MCODE=IFAS2 to view all records appearing within the University of Florida Vol. 2 binder, or: see records related to IFAS2 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCarty, L. B., F. T. Corbin, and J. M. Higgins. 1988. Sethoxydim Absorption, Translocation, and Metabolism in Centipedegrass and Goosegrass.. South. Weed Sci. Soc. Proc. 41:p. 122. |
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