Cellular expression of GAPCp1 under the control of its native promoter or the PHT promoter. A, GAPCp1-GFP expression under the control of the PHT promoter at the root tip (top left), at 3.15 mm from the root tip (top middle and right), and in epidermal leaf cells (bottom). B, GUS expression under the control of the GAPCp1 promoter (ProG1:GUS) in seedlings (left), cotyledons (middle), and root meristem (right). C, GFP expression under the control of the GAPCp1 promoter (ProG1:GFP) in leaf epidermal cells (left), root columella (middle), and root epidermal cells (right).