Fig.1. Effect of water stress on water transport in the excised roots (JV) of different
sunflower cultivars. The plants were grown in pots with perlite and watered with a standard nutrient solution for 14 days. Then, 50% of the plants were subjected to water stress by applying de
ficit irrigation for 15 days. At the end of the water stress
period, all plants were de-topped and immediately thereafter, the excised roots were watered with a standard nutrient solution containing 2.5mM RbCl. The exudates of the excised roots were collected for 24 h (control vs. water stress).Forall treatments, values are the mean of 4 replicates standard error. The level of significance of Tukey’s test for each cultivar is shown at the top of each bar; *