Figure 2.

Sulfate transport increases with water stress. (A) Root xylem sap sulfate concentration for well-watered (open bars) and water-stressed (closed bars) Zea mays plants 7, 10 and 12 days after water was withheld. Values are the mean ± SE of 12 plants for each treatment each day. Significant differences between treatments are indicated as ***p < 0.001. (B) Fold change in gene expression of a sulfate transporter in the elongation region (1–6 cm distal to the root tip) of water-stressed maize roots relative to well-watered controls as water stress increases.