Table 1.
Chi-square analysis of root growth direction of Daucus carota in 1g (GRE) and in microgravity (ISS) conditions.
| Substrate | Seed | Expected (%) | Observed | (%) | x2 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Orientation | Orientation | N | W | N | W | ||||
| ISS | Rn | 100 | 0 | 94 | 6 | 0.06 | 1 | 0.80 | |
| Rw | 100 | 0 | 55 | 45 | 2.27 | 1 | 0.13 | ||
| Rn + Rw | 100 | 0 | 78 | 22 | 1.30 | 1 | 0.24 | ||
| GRE | A | Rn + Rw | 100 | 0 | 100 | 0 | 0.00 | 1 | 1.00 |
| B | Rn + Rw | 100 | 0 | 0 | 100 | 29.00 | 1 | 0.00 | |
Rn and Rw refer to seed orientation facilitating the radicle growth toward the substrate with nutrients (N) or with water (W), respectively. A = seeds placed with the radicle pointing downwards; B = seeds placed with the radicle pointing upwards.