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Light micrographs showing gravitropic curvature of apical cells in different media. A, Control. Upright cell in water for 1 h, then reoriented to the horizontal for 4 h. B, As in A, except in 60% (w/v) iodixanol throughout. C, Horizontal for 8 h in 50% (w/v) BSA, starch stained with IK2I. The gravity vector (arrow) is toward the bottom of all micrographs. Arrowheads show regions of plastid sedimentation. Scale bars = 20 μm.
