Free space binding and uptake of ions by excised roots of grapevines

The uptake of of potassium and sulphate ions by excised roots of two species of Vitis (V. vinifera cv Verduzzo trevigiano and the hybrid rootstock V. berlandieri x V. rupestris 1003 P) was studied and compared. It si shown that important differences between genotypes can occur in the binding of ions in the free space