Lj. Newsom et al., ABSORPTION, TRANSLOCATION, AND METABOLISM OF AC-263,222 IN PEANUT (ARACHIS-HYPOGAEA), SOYBEAN (GLYCINE-MAX), AND SELECTED WEEDS, Weed science, 41(4), 1993, pp. 523-527
The C-14-AC 263,222 was foliar applied to common cocklebur, johnsongra
ss, peanut, sicklepod, and soybean in order to study translocation and
metabolism characteristics in each species. Differential absorption o
f C-14-AC 263,222 between species was evident 4 h after application. A
t 48 h after application, sicklepod and peanut absorbed more C-14-AC 2
63,222 than johnsongrass, common cocklebur, or soybean. Translocation
of C-14-AC 263,222 and its metabolites out of the treated leaves incre
ased with time for all species. The C-14-AC 263,222 and its metabolite
s appear to be both xylem- and phloem-mobile based on patterns of move
ment. Absorption and translocation differences occurred between specie
s; however, they did not appear to explain differential species respon
se. Metabolism of C-14-AC 263,222 differed greatly among species. Comm
on cocklebur metabolized less C-14-AC 263,222 than any other species 9
6 h after application. Johnsongrass and sicklepod metabolized 24 and 2
8% of the C-14-AC 263,222, respectively, 96 h after application. Peanu
t and soybean metabolized 76 and 62%, respectively, of the C-14-AC 263
,222 96 h after treatment. The half-life of C-14-AC 263,222 was 1.1, 2
.5, 7.7, 11.6, and 34.5 d in peanut, soybean, sicklepod, johnsongrass,
and common cocklebur, respectively. Differential tolerance of species
appears to be directly related to the half-life of AC 263,222 in the
plant.