Figure 2.

Changes in rates of elongation of primary roots (A) and in the water potentials of agar blocks (B) after agar blocks had been applied to the root tip. Eight to 10 agar blocks from four or five roots were used for each measurement. Bars represent sds (n = 3 in A and n = 3–5 in B). Closed and open circles represent water potentials of −0.03 and −1.6 MPa, respectively, for agar blocks applied to roots at the beginning of the treatment.