It is known that water stress reduces the availability of
potassium in the soil (Parra et al., 2003), and K+ starvation in
sunflower plants promotes hydraulic conductivity in excised roots
(Quintero et al.,1998) as well as water uptake in transpiring plants
(Fournier et al., 2005). According to these findings, it seems that
water stress could cause K+ starvation in the plant, which could
increase water transport in the root. However, it cannot be ruled
out that water stress itself could induce a specific action on the
hydraulic behaviour of the root, which could lead to water stress
recovery in the plant after re-watering. The results obtained in this
study, based on excised roots in which the main route for radial
water transport is the cell-to-cell path (Steudle,1994),
It is known that water stress reduces the availability ofpotassium in the soil (Parra et al., 2003), and K+ starvation insunflower plants promotes hydraulic conductivity in excised roots(Quintero et al.,1998) as well as water uptake in transpiring plants(Fournier et al., 2005). According to these findings, it seems thatwater stress could cause K+ starvation in the plant, which couldincrease water transport in the root. However, it cannot be ruledout that water stress itself could induce a specific action on thehydraulic behaviour of the root, which could lead to water stressrecovery in the plant after re-watering. The results obtained in thisstudy, based on excised roots in which the main route for radialwater transport is the cell-to-cell path (Steudle,1994),
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