Figure 2.

NHX2 Promoter-GUS Expression Pattern in Transgenic Arabidopsis Plants.

(A) GUS activity detected in cotyledons.

(B) Strong GUS staining in guard cells of stomata in mature leaves.

(C) to (E) Preferential expression in the vasculature of the main stem (C) and roots (E). Note the strong expression in the root-shoot transition (D) and the point of emergence of secondary roots (E).

(F) Strong GUS staining in the root meristems.

(G) to (L) Expression in reproductive organs was greater in filaments of the stamen ([G] and [I]), stigma ([G] and [H]), mature grain pollen (I), and silique septum (L). Note the high expression in the stomata of anthers in (J), which is a close-up image of (I), and in the elongating pollen tube (marked by arrow) (K).

Bars = 20 μm in (K), 50 μm in (B), 100 μm in (A), (C), to (F), and (I), and 400 μm in (G) and (L).