Abstract
The effects of different concentrations of ethrel (2-chloroethane phosphonic acid) on theabsorption and transport of Rb+ in wheat seedlings grown in low salt (0.2 mM CaCl2) or high salt (dilute nutrient) solutions were studied. The presence of ethrel (20 ppm) was found to be very inhibitory to both the absorption and transport of Rb+ during a 24 hours absorption period, in general. A time course uptake pattern revealed that the rate of inhibition increased with time. Pretreatment of the roots with ethrel (20 ppm) for 48 hours was also effective in reducing the absorption and transport particularly in seedlings grown in low salt medium. It is suggested that ethrel resembles the respiratory inhibitors in their action on ion uptake.
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