Fig. 3. Expression of the RpoT;2-mGFP5 in stably transformed Arabidopsis plants. (A) Fluorescence in root hair cells using the FITC-filter set. Under tissue culture conditions, some of the root plastids (arrowheads) accumulate photosynthetic pigments as evident by their yellowish color. (B–D) Counterstain of root tissue with MitoTracker-Red. GFP (B), and red MitoTracker (C) fluorescence were detected separately and merged (D) using Photoshop 5.0 software. Images were taken by epifluorescence microscopy using filter sets 488013 (B) and 488015 (C). Bars equal 10 µm.