Table I.
Rates of cell production in the primary root of gpa1 and agb1 mutants and transgenic lines overexpressing GPA1 or AGB1
Root elongation rate and cortical root cell length were collected from at least 10 seedlings. se is indicated. Pairwise Student's t test was used to compare values to the control (1). *, Significant (P = 0.05); **, highly significant (P = 0.01).
| Genotype | Root Elongation Rate | Cortex Cell Length | Cell Production Rate |
|---|---|---|---|
| μm/h | μm/cell | cell/h | |
| No transgene | |||
| (1) Col | 176.67 ± 12.11 | 175.43 ± 18.34 | 1.01 ± 0.05 |
| (2) gpa1-4 | 180.00 ± 14.15 | 171.66 ± 20.22 | 1.05 ± 0.06 |
| (3) agb1-2 | 290.83 ± 16.68 | 176.53 ± 19.48 | 1.65 ± 0.10** |
| (4) gpa1-4 agb1-2 | 309.67 ± 21.52 | 180.50 ± 21.13 | 1.72 ± 0.12** |
| Overexpression of GPA1: | |||
| (5) in Col | 128.62 ± 10.20 | 151.24 ± 18.13 | 0.85 ± 0.04* |
| (6) in gpa1-4 | 180.02 ± 13.36 | 166.13 ± 21.12 | 1.08 ± 0.08 |
| (7) in agb1-2 | 300.00 ± 17.62 | 181.66 ± 20.22 | 1.65 ± 0.11** |
| (8) in gpa1-4 agb1-2 | 303.86 ± 22.64 | 177.46 ± 20.54 | 1.71 ± 0.10** |
| Overexpression of AGB1: | |||
| (9) in Col | 132.50 ± 9.48 | 166.59 ± 19.72 | 0.80 ± 0.05** |
| (10) in gpa1-4 | 186.67 ± 16.62 | 169.46 ± 19.22 | 1.10 ± 0.09 |
| (11) in agb1-2 | 162.50 ± 15.48 | 175.87 ± 21.04 | 0.92 ± 0.08 |
| (12) in gpa1-4 agb1-2 | 187.50 ± 16.58 | 177.03 ± 19.68 | 1.06 ± 0.08 |