Table II.

Rate and final angle of curvature of Arabidopsis roots

Cells Ablated1-aRate of Curvature1-bFinal Angle1-c
degrees h−1 degrees
Control13.49  ± 1.1276.61  ± 2.59
Tip cells13.97  ± 1.6876.13  ± 3.62
Tip/S37.95  ± 1.0763.14  ± 3.07
Tip/S3/S2 (S1 intact)3.89  ± 0.5431.10  ± 6.16
Tip/S3/S2/S108.13  ± 2.56
S2/S12.20  ± 0.5918.99  ± 6.43
S39.58  ± 1.2561.53  ± 2.43
S28.94  ± 1.0253.07  ± 2.89
S17.32  ± 1.4252.82  ± 4.85
Tip/S2/S1 (S3 intact)2.44  ± 0.6019.06  ± 5.92
Tip/S3/S1 (S2 intact)5.31  ± 0.7343.92  ± 3.23
S1/S2/S3 (tip cells intact)0.40  ± 0.586.48  ± 2.29
Peripheral cap cells14.01  ± 1.0770.17  ± 2.18
Central columella4.58  ± 0.6042.66  ± 4.67
Flank columella5.60  ± 0.8373.5  ± 1.12

The indicated cells were ablated, and after a 2-h recovery period, the roots were rotated 90° from vertical. The resulting curvature during a 12-h period was recorded and analyzed. Values are means ± se, n ≥ 10 roots.

    • F1-a See Figures 1B and 2B for definitions of ablated cells.

    • F1-b Rate represents average rate of curvature during the first 3 h of stimulation.

    • F1-c Final angle is the angle reached after 12 h of gravistimulation.