Abstract
Absorption, translocation and metabolism of DTP [4-(2, 4-dichlorobenzoyl)-1, 3-dimethyl-5-hydroxypyrazole], the hydrolysate and herbicidal entity of pyrazolate, in rice plants was studied by using 14C-preparations labeled either at the pyrazole ring or at the benzene ring under a water-culture condition. DTP was readily absorbed into the roots, rapidly metabolized and part of the radioactivity was translocated into the foliages. The metabolism of DTP involved hydroxylation of the 3-methyl group and subsequent oxidation to carboxyl group, demethylation of the 1-methyl group, cleavage of 2, 4-dichlorobenzoyl linkage, and conjugation.
