Analysis of <i>Arabidopsis PSY</i> promoter activity in roots.

<p>Representative images from transgenic <i>PSY:GUS-GFP</i> (A, C, D, G–J) and control <i>35S:GUS-GFP</i> (B, E, F) seedlings are shown. (A) GUS staining of <i>PSY:GUS-GFP</i> seedlings. (B) GUS staining of <i>35S:GUS-GFP</i> seedlings. (C) Bright field image of the region boxed in blue in A. (D) GFP fluorescence of the root shown in C. (E) Bright field image of the region boxed in blue in B. (F) GFP fluorescence of the root shown in E. (G) GUS staining of the upper region of the root shown in C. (H) Cross-section of the root region shown in G. (I) Magnification of the region boxed in G. (J) Close up of the stele area in a GUS-stained and resin-embedded section. ep, epidermis; c, cortex; s, stele; en, endodermis; pe, pericycle; p, phloem; pc, phloem companion cells; x, xylem.