Taking into account the role of potassium in the osmotic cell
adjustment and in the hydration of the plant (Hsiao and Läuchli,1986), it is reasonable to assume that water stress can affect the regulationofpotassiumtransportfromtheroottotheshootaspart
of the plant
’
s general strategy for restoring cell turgidity and plant
growth after a water stress period. Despite its importance, little is
known about this subject matter. However, the results obtained in
this work support the hypothesis that re-watering roots after a
water de
fi
cit favours the transport of K
+
in the root in direct
proportion to the degree of susceptibility to water stress of the
differentcultivars. Inotherwords,thehigher thesusceptibility,the