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