Selectivity of Dicamba in Wheat and Wild Buckwheat

Author:

Quimby P. C.,Nalewaja John D.

Abstract

The uptake, translocation, and fate of14C-labeled 3,6-dichloro-o-anisic acid (14C-dicamba) were studied in wheat (Triticum aestivumL., 'Selkirk’) and wild buckwheat (Polygonum convolvulusL.) as resistant and susceptible species, respectively. Selectivity could not be explained by interspecific differences in uptake of14C-dicamba by leaf sections submerged in exogenous solutions.14C-dicamba accumulated in meristems of wild buckwheat but not in the youngest tillers of wheat. Moreover, wheat main culms conjugated or metabolized14C-dicamba more quickly than did wild buckwheat meristems. Therefore, selectivity of dicamba apparently was related to interspecific differences in translocation and metabolism.

Publisher

Cambridge University Press (CUP)

Subject

Plant Science,Agronomy and Crop Science

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