Fig. 4
Four typical curves and segment of flow rate to time during measurement. Different segments were marked with different color. A, B Non-steady curves identified as the slope of last 15 min segment was not equal to zero. C Non-steady curve identified as measurement time corresponding to the last segment was less than 15 min. D Steady curve, the last segment was longer than 15 min and the slope of last 15 min segment was equal to 0. P represents the P-value of in the last 15 min segment (see details in “Materials and methods” section). ψfinal is the initial leaf water potential