Table I.

Gravity response of Arabidopsis roots in the presence of ATP 24 h after reorientation

	Growth	Curvature	P Value
	mm	degrees
Control	3.60 ± 0.33	63.5 ± 5.8
1 mm ATP	4.10 ± 0.35	56.3 ± 3.9	0.32
3 mm ATP	3.93 ± 0.37	40.0 ± 4.6	0.0054
5 mm ATP	3.05 ± 0.24	34.9 ± 4.6	0.0011
5 mm ADP	3.36 ± 0.20	47.1 ± 5.5	0.058

Each value is the average and se of 10 separate plants and the P values for gravity response were determined by Student's t test. For all samples, the growth differences had P > 0.15.