Table I.
Root-elongation rates of maize seedlings
| Exposure Time | Control | Al |
|---|---|---|
| h | mm/h | |
| 0 | 1.73 ± 0.03 | – |
| 4 | 1.65 ± 0.05 | 1.22a± 0.09 |
| 24 | 1.66 ± 0.05 | 1.70 ± 0.04 |
Plants were exposed to nutrient solutions containing 0 (control) or 20 μm Al for different times. The growth rate of the 0-h time sample was determined during the 72-h pretreatment. Values are means ± se (n ≥ 24).
a
Significantly different at P < 0.05 (analysis of variance followed by Tukey's honestly significant difference [HSD] mean-separation test).