TABLE 3.

Elongation rate, final cell length, and cell production rate of the primary root in the B73 oxalate oxidase transgenic and wild-type lines at 48 or 72 h after transplanting to well-watered or water-stressed (−1.6 MPa) conditions, respectively.

	B73, well-watered			B73, water-stressed
	Wild-type	Transgenic	Change compared to wild-type (%)	Wild-type	Transgenic	Change compared to wild-type (%)
Root elongation rate (mm h–1)	1.86 ± 0.03	2.56 ± 0.04**	38	1.24 ± 0.01	0.96 ± 0.06**	−23
Final cell length (μm)	187 ± 1	210 ± 2**	13	142 ± 2	132 ± 4	−7
Cell production rate (cells h–1)	10.0 ± 0.1	12.2 ± 0.2**	22	8.8 ± 0.2	7.2 ± 0.2*	−17

Elongation rates were calculated for the preceding 12 h (well-watered) or 24 h (water-stressed) periods. Values are means ± SE of three to four roots. Asterisks denote significant differences between the transgenic and wild-type lines (t-test; * P < 0.05; ** P < 0.01).