Figure 2.

Earliest stages of LRP development detected on whole mounts of three different roots by using Nomarski optics. A, Three-cell stage 4.51 mm from the root tip. B, Four-cell stage 4.61 mm from the root tip. Note that LRPs on plates A and B also can be considered as two- and three-cell stages, respectively, because their right or left cell walls (arrowheads) can separate a founder cell from a neighbor pericycle cell. C, Five-cell stage at 6.71 mm from the root tip. pc, Pericycle; px, protoxylem. Bar = 25 μm.