Translocation of 14CO2 and 14C- deoxyglucose in bracken (Pteridium esculentum Forst. f. Cockayne): Implications for herbicide efficacy

Abstract

The translocation of photoassimilates and foliarly applied chemicals in glasshouse-grown Australian bracken (Pteridium esculentum Forst. f. Cockayne) was investigated using two radiotracer techniques: (1) pulse labeling of 14CO2 in enclosed fronds and (2) application of 14C-deoxyglucose using a microsyringe in fully expanded frond. In the first experiment, the translocation and distribution of 14CO 2 was determined in the different parts of 4-mo-old bracken, where either the young or old frond was pulse-labeled with 14CO 2. In the second experiment, the effects of pretreatment application of plant hormones (kinetin or ethephon) in the translocation and distribution of 14C-deoxyglucose and me..