EFFECT OF LINURON ON THE UPTAKE OF EXOGENOUS C-14 SUCROSE BY THE DETACHED EARS OF 2 WHEAT GENOTYPES

The effect of a low concentration of linuron (2 x 10(-8) M) on the upt ake of exogenous C-14-sucrose by ears of wheat (Triticum aestivum L.) cut below the internode of the flag leaf was studied on intensive (Obr ii) and extensive farming (Kooperatorka) cultivars of wheat under diff erent light conditions. At certain stages of maturation, linuron stimu lated the uptake of exogenous C-14-sucrose from the nutrient solution into detached ears when the plants were continuously illuminated. In t he dark, this effect was not observed. The ears of the intensive culti var accumulated C-14-sucrose in the presence of linuron more actively than those of the extensive one. It was concluded that the action of l inuron on the C-14-sucrose uptake by the ear was related to the effect of herbicide on the photosynthesis of the flag leaf.