Table 5. Comparison of root growth and apparent cell division rate under maximal growth rate conditions.

	Root growth (mm/day)	Division rate (cell number increase/day)
		epidermis	cortex	endodermis
WT	6.0	28-44	32-49	43-72
lit-1	0.15	5-14	5-13	6-14
cob-1	0.3	10-23	11-23	15-30
qui-1	1.0	22-46	27-55	34-66
pom1-1	0.65	9-21	12-30	16-43
cud-1	0.1	2-5	3-6	4-8
pom2-1	1.3	16-35	21-42	30-57

Root growth was determined by measuring the root length differences between day 4 and 6 after germination. The apparent cell division rate was calculated by dividing the root growth per day by the cell length (± the standard deviation; see Table 2).