Behavior of¹⁴C-Haloxyfop-Methyl in Intact Plants and Cell Cultures

Abstract

Behavior of 14 C-haloxyfop-methyl {methyl 2-[4-[(3-chloro-5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoate} was examined in intact plants of soybean [ Glycine max (L.) Merr. ‘Mead’], shattercane [ Sorghum bicolor (L.) Moench. ♯ SORVU], and yellow foxtail [ Setaria glauca (L.) Beauv. ♯ SETLU] and in cell cultures of soybean and yellow foxtail. Foliar absorption of 14 C-haloxyfo-methyl by intact plants was almost complete within 48 h. Significant translocation occurred within 48 h of treatment, with soybean and shattercane plants translocating more 14 C than yellow foxtail. Metabolism of 14 C-haloxyfop-methyl in intact plants was similar among species. Haloxyfop-methyl was rapidly hydrolyzed to haloxyfop in treated leaves and then translocated to metabolically active areas within the plants. Significant quantities of polar products were also isolated. Soybean cells in suspension culture contained higher levels of 14 C than did yellow foxtail cells. Most of the 14 C in soybean cells was haloxyfop-methyl, while yellow foxtail contained mostly haloxyfop.