Abstract
Eleven- to twenty-day-old intact sunflower plants ( Helianthus annuus L. cv. Sun-Gro 380) grown in nutrient solutions with different K + levels were used to study the effect of K + status and abscisic acid (ABA) on water flow. Changes in nutrient potassium levels prompted no significant changes in growth, although there were evident differences in internal K + content and water uptake capacity. Water uptake was greater, and water use less efficient, in moderately K + deficient plants than in controls. Addition of 4 μM ABA to the external medium induced a differential effect between the two types of plant, inhibiting water uptake more effectively in plants with normal K + status. The effect of internal K + content on xylem sap pH was also studied, pH was more acidic in moderately K + deficient plants than in controls. These results suggest that water flux regulation could be impaired in K +-starved plants.
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