Absorption and translocation of metobromuron and chlorbromuron
Titel:
Absorption and translocation of metobromuron and chlorbromuron
Auteur:
Hogue, E. J.
Verschenen in:
Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes
Paginering:
Jaargang 13 (1978) nr. 3 pagina's 323-339
Jaar:
1978
Inhoud:
Tomato (Lycopersicum esculentum Mill., 'Heinz 1350'), a crop plant susceptible to both herbicides used, readily absorbed root-fed 3-(p-bromophenyl)-l-methoxy-l-methylurea (metobromuron) and 3-(4-bromo-3-chlorophenyl)-l-methoxy-l-methylurea (chlorbromuron) and translocated them to the foliage. The umbelliferous crop plants, carrot (Daucus carota L., 'Gold Pak') and coriander (Coriandrum sativum L.)., both moderately susceptible and resistant to metobromuron and chlorbromuron respectively, absorbed and translocated metobromuron to the foliage but chlorbromuron, although found in the roots of these plants in high concentration, was not translocated upward appreciably. Neither herbicide applied to the leaves was translocated away from the area of application in significant amounts in either tomato or coriander. The thin layer chromatography of extracts from the various plant parts indicated that neither compound was metabolized appreciably by the resistant coriander. Extracts from roots and tops of the susceptible tomato, however, showed significant amounts of radioactivity remaining at or near the same Rf as 4-bromophenylurea and 3-chloro-4-bromophenylurea. The physiological tolerance of umbelliferous crops to chlorbromuron appeared to be due primarily to lack of translocation of this photosynthetic inhibitior to the tops. The greater tolerance of carrot and coriander to metobromuron than tomato could not be explained on the basis of either differential uptake or metabolism.
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