Table II.

Lateral root numbers of gpa1 and agb1 mutants and transgenic lines overexpressing GPA1 or AGB1

Lateral roots were counted from 9-d-old, light-grown seedlings. Shown are the average numbers of lateral roots from at least 10 seedlings with associated se. Pairwise Student's t test was used to compare values to the control (1). *, Significant (P = 0.05); **, highly significant (P = 0.01).

Genotype	Lateral Root No.	t Value
No transgene
(1) Col	5.2 ± 0.58	–
(2) gpa1-4	3.4 ± 0.42	2.51*
(3) agb1-2	14.6 ± 1.30	6.61**
(4) gpa1-4 agb1-2	14.2 ± 1.26	6.49**
Overexpression of GPA1:
(5) in Col	7.7 ± 0.80	2.26*
(6) in gpa1-4	5.8 ± 0.60	0.72
(7) in agb1-2	15.1 ± 1.26	7.14**
(8) in gpa1-4 agb1-2	14.7 ± 1.32	6.59**
Overexpression of AGB1:
(9) in Col	3.3 ± 0.52	2.44*
(10) in gpa1-4	3.0 ± 0.44	3.02**
(11) in agb1-2	4.0 ± 0.45	1.63
(12) in gpa1-4 agb1-2	3.5 ± 0.48	2.26*