Fig. 4.

Activity of the AtMTP11 promoter is tissue-specific. PrAtMTP11::GUS-transformed seedlings were grown for 2–3 weeks on half-strength MS plates and stained for GUS activity. (A) GUS is expressed in roots and shoots. (B) In leaves, expression is more pronounced at the leaf margin. (C) Expression is particularly high in hydathodes. (D) In the epidermal cell layer, only guard cells show GUS staining. (E) Trichomes do not show GUS staining. (F) In roots, staining is strongest at the root tip. Data for line 5 are shown; five other lines gave comparable results.