For the exudate collection,the excised roots were maintained in
a fresh standard nutrient solution without PEG to measure water
and K+ transport. Again, bothcultivars showed different behaviour.
The roots of Olimpia subjected to water stress using PEG showed
higher water and K+ transport than the roots of the control plants.
In contrast, this water stress treatment did not affect the water or
K
+
transport in the excised roots of Jazzy (
Fig. 4
). In addition, PEG
did not have a signi
fi
cant effect on the total xylem solute
concentration (mM) in Olimpia, i.e., 15.15
1.00 (control) vs.
16.25
0.92(PEG).Theseresultssupportthoseobtainedinthe
fi
rst
experiment.