Figure 3.

Characteristics of the earliest LRPs (detected on whole mounts) by their location in the primary root, by number of cells, and by the interval of time between displacement from the meristem and the initiation of LRP formation. The number of cells in the earliest LRP corresponds to the number of cells in a pericycle cell file, but not to the total number of LRP cells. The minimum number of LRP cells in a cell file was three cells, similar to LRPs shown in Figure 2A. This three-cell stage can be interpreted as a two-cell stage (see notes in Fig. 2, A and B).