Table 1. IAA concentrations in root tips, root base and shoot base, and IAA[root tips]/IAA[shoot base] radio in alfalfa seedlings grown for 1, 3 and 10 days on ½-strength Hoagland’s medium (pH 4.5) with treatments of no Aluminum(-Al), Aluminum stress (Al) (100 μM AlCl3), Aluminum with additional IAA (Al + IAA) (100 μM AlCl3 + IAA) and -Al with additional IAA(-Al + IAA).
| Treatments | 1d | 3d | 10d | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Root tips | Root base | Shoot base | Root tips/shoot base* | Root tips | Root base | Shoot base | Root tips/shoot base* | Root tips | Root base | Shoot base | Root tips/shoot base* | |
| -Al | 1.276 ± 0.215b | / | 12.81 ± 1.784b | 9.961 | 2.397 ± 0.407a | 3.672 ± 0.481b | 34.49 ± 1.230b | 6.950 | 1.193 ± 0.131b | 3.435 ± 0.420b | 23.43 ± 0.504b | 5.092 |
| Al | 0.185 ± 0.044c | / | 11.93 ± 1.279b | 1.551 | 0.219 ± 0.058b | 6.079 ± 0.687a | 17.79 ± 2.557c | 1.231 | 0.315 ± 0.038c | 5.117 ± 0.507a | 13.53 ± 1.890d | 2.328 |
| Al + IAA | 0.772 ± 0.189bc | / | 22.75 ± 0.787a | 3.393 | 0.348 ± 0.069b | 5.491 ± 0.001a | 42.83 ± 3.435a | 0.813 | 0.562 ± 0.199c | 6.084 ± 0.615a | 19.10 ± 0.748c | 2.942 |
| -Al + IAA | 2.506 ± 0.405a | / | 24.13 ± 2.052a | 10.385 | 2.996 ± 0.119a | 2.941 ± 0.318b | 43.82 ± 3.155a | 6.837 | 1.721 ± 0.184a | 4.905 ± 0.009ab | 27.91 ± 0.491a | 6.166 |
Data are means ± SE of three replicates. Columns with different letters indicate a significant difference at P < 0.05 (least significant difference test).
*Root tips/shoot base is the radio of 100·IAA[root tips]/IAA[shoot base].