Table II.

⁶⁵Zn partitioning in intact wheat seedlings

Time	Bread	Durum
h	Shoot [Zn]:root [Zn]a
2	8.2  (1.3)	8.1  (0.8)
4	14.2  (1.3)	14.7  (1.2)
8	17.1  (2.1)	16.0  (3.1)
12	24.6  (5.0)	19.7  (1.8)
24	45.7  (6.8)	42.1  (1.9)

Roots were immersed in a solution containing 4 μm ⁶⁵ZnSO₄, 2 mm Mes-Tris (pH 6.0), 0.2 mm CaSO₄, and 12.5 μm H₃BO₃. After the given uptake period, roots were desorbed for 15 min in a 2°C solution containing 5 mm Mes-Tris (pH 6.0), 5 mm CaSO₄, 12.5 μm H₃BO₃, and 100 μm ZnSO₄. Shoot:root concentration data represent means and se values (in parentheses) of four replications.

^aShoot [Zn] is in nmol g fresh wt⁻¹ × 10³; root [Zn] is in nmol g fresh wt⁻¹.