Table II. Histological analysis of the hairy and elongation regions in the primary root of 4- and 9-d-old gte4 and wild-type seedlings.

Mean length, mean cell area, and mean cell number (±se) of cortical cells in the hairy region and in the elongation region are shown at days 4 and 9 (100 cells randomly chosen in 10 specimens per genotype). Values followed by no letter are not significantly different between genotypes in the same region on the same day.

Parameter		Wild-Type Hairy Region	Wild-Type Elongation Region	gte4 Hairy Region	gte4 Elongation Region
Day 4	Length (μ m)	2,342.3 ± 210.5a	565 ± 45.5a	594.8 ± 82.9	308.8 ± 39.2
	Cell area (μ m2)	1,571.4 ± 151	587.6 ± 122.1	1,861.5 ± 131.5	369.9 ± 95.8
	Cell no. per region	202.4 ± 19a	118.7 ± 15.3b	66.6 ± 6.3	95.3 ± 20.6
Day 9	Length (μ m)	15,406.3 ± 1,181.4a	509.7 ± 30a	6,419.5 ± 1,023.9	342.5 ± 23.4
	Cell area (μ m2)	1,467.8 ± 66.9	384.9 ± 11.7	1,654.7 ± 258	577.8 ± 113.2
	Cell no. per region	1,265.4 ± 109.9a	155.3 ± 12a	479.6 ± 145.7	68.7 ± 15.5

^aValues statistically different (P < 0.01) with respect to the corresponding region in the gte4 genotype on the same day.

^bValues statistically different (P < 0.05) with respect to the corresponding region in the gte4 mutant on the same day.