Table I.

Estimation of time between displacement of pericycle cells from the meristem to the first detected LRPs of three- and four-cell stage (Ti)

Stage of LRP Development	V	Lg	Le	Lp	Te	Tbf	Ti
	μm h−1	μm			h
Three-cell (n = 9)	362 ± 14	1,203 ± 57	826 ± 51	4,402 ± 324	4.6 ± 0.2	8.9 ± 1.0	13.6 ± 0.9
Four-cell (n = 5)	349 ± 17	1,289 ± 51	922 ± 44	5,509 ± 461	5.3 ± 0.2	12.3 ± 1.6	16.0 ± 2.0

Three- and four-cell stages of LRP development can be interpreted as two- and three-cell stages (see legend, Fig. 2). 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. V is the rate of root growth; Lg is the length of the growing part of the root (the sum of the length of the meristem and the length of the elongation zone); Le is the length of the elongation zone; Lp is the distance from the root meristem-root cap junction to the earliest-detected primordium; Te is the duration of cell elongation; Tbf is a time after cells had completed elongation and before a primordium formation. Each variable was determined for an individual root. Data are means ± se.