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Micrographs showing that exposure of the seedlings to 0°C for 6 min depolymerized cortical microtubules to the same extent for transverse, oblique, and longitudinal orientations in well-watered and water-stressed roots. A to D, Well-watered roots; E to H, water-stressed roots. Examples of transverse (A and E), oblique (B and F; right-handed helical), longitudinal (C and G), and oblique (D and H; left-handed helical) microtubule orientations. Bar = 20 μm.
