Figure 4.

Northern-blot analysis of StGCPRP transcript levels in potato tissues. a, RNA extracted from epidermal fragments, from mature leaves, and from very young leaves (harvested from the shoot apex). Note that epidermal fragments originated from mature leaves. b, RNA isolated from various potato tissues. The northern blot indicates strong expression of the StGCPRP gene in flowers and developing fruits. c, RNA extracted from leaves of different developmental stages. d, RNA from different leaflets of the most developed leaves from a 6-week-old plant. The position of the leaflets is schematically indicated below the autoradiogram. For comparison, signal intensitiy is shown for a leaf harvested from the shoot tip.