Fig. 5.

Detail of the model dynamics within three selected phytomers on two consecutive days with different environmental conditions. During this timeframe, phytomers 6 and 7 were already fully grown (with the exception of radial internode growth), while phytomer 8 was still in its growth phase. Simulated transpiration rates (A) showed only minor differences for the three leaves, but strong differences between the two days. Due to differences in cumulative xylem flow resistance from soil to respective phytomer internodes (B), daily decline in turgor pressure in response to transpiration was stronger in phytomers higher in the plant (C and D). Turgor pressure in phytomer 8 showed a decline during night-time hours (as opposed to the fully grown phytomers) resulting from cell relaxation under its irreversible growth.