Fig. 4. Cortical microtubules of wild type, rsw4 and rsw7 in the elongation zone (wild type) or swollen region of the root. (A-C) Cortical microtubules in epidermal cells imaged with confocal microscopy. (D-F) Cortical microtubules in root cortex imaged in longitudinal methacrylate sections. (A,D) Wild type, (B,E) rsw4 and (C,F) rsw7 plants grown at 19°C for 6 days and transferred to 30°C for 2 days. Bars: 10 µm.