Figure 1.

Stolon Tips of Potato (cv Desire) Showing Regions Taken for Analysis of Phloem Unloading and Sucrose Metabolism.

(A) Note the prominent stolon hook, which marks a clear distinction between apical and subapical regions. Segments taken for analyses are indicated on the stolon.

(B) Tuberizing stolon tips taken from a single plant. A number of distinct stages in the swelling process are apparent, ranging from no swelling (1) to prominent subapical swelling (4). Note the progressive incorporation of the apical bud into the growing tuber.

Bars in (A) and (B) = 1 mm.