Table III.

Comparison of the effects of the stp1 mutation, 1 μm zeatin, and 30 nm 2,4-D on elongation and division parameters of the primary root

	Elongation Parameters				Cell Division Parameters
	Root growth rate	Meristem strain rate	Maximal strain rate	Time in elongation zone	Cell production	Cell division rate	Time in meristem	Meristem cell number
Development	⁺ ⁺	0	0	0	⁺ ⁺	0	⁺ ⁺	⁺ ⁺
2,4-D	−	−	0	−−	−	−	⁺ ⁺	0
Zeatin	−−−	−−	−−	0	−−−	−−	0	−−
stp1	−−−	−	−−	0	−−	−	−−	−−

The first row describes the changes in wild-type root growth that occur during development as reported by Beemster and Baskin (1998). The symbols in the table are as follows: 0, no effect; −, slight reduction in the value of the parameter; −−, intermediate reduction; −−−, severe reduction; and ⁺ ⁺, intermediate increase in the parameter.