Abstract
SummaryExudation by excised roots of eleven Lolium varieties has been studied. Data on the rate of potassium translocation, the rate of water movement through the roots, the concentration of potassium in the xylem exudate, the electrical potential gradient across the roots, and the electrochemical potential difference for potassium across the roots is reported. Each parameter showed significant variation among the varieties with only water flux grouped according to species. It is suggested that the variation in rate of potassium translocation can be attributed partly to differences in the rate of water movement through roots and partly to differences in the intensity of transport to the xylem.
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