Figure 2.

Change in L of C. corallina internode cells when P was changed rapidly with a P pulse. P pulses were given for 10 s with a pressure probe (A) and L was recorded (B). During each pulse, L increased rapidly at first and then more slowly to give the total length increase ΔL_T. When the P was returned to the original level, L decreased rapidly to give the reversible component ΔL_r. The ΔL_i was a small, irreversible component seen whenever P increased rapidly. The variations in P (after it was returned to the original level) were generated intentionally to test for continuity between the probe contents and the cell contents. Temperature was 23°C. This cell was 13 mm long and growing at 0.014 μm s⁻¹ for 20 min before the experiment. L is shown as the length beyond L_o at the beginning of the trace.