Table 2. Parameters of the hydrothermal time model characterizing germination of A. tenuissimum seeds at sub-optimal and supra-optimal T.
| Hydrothermal time model parameters | Sub-optimal T | Supra-optimal T |
|---|---|---|
| Tb (°C) | 7.0 | 7.0 |
| θHT (MPa °C d) | 43.9 | 43.9 |
| Ψb(50) (MPa) | −0.67 | −0.67 |
| σΨb (MPa) | 0.28 | 0.32 |
| R2 | 0.89 | 0.81 |
| To(°C) | – | 20.5 |
| Tc(50) (°C) | – | 27.2 |
| KT(MPa °C−1) | – | 0.1 |
Notes.
- Tb
- base temperature
- To
- optimal temperature
- θHT
- hydrothermal time constant
- Ψb(50)
- base water potential for 50% seed germination
- σΨb
- standard deviation for Ψb(g)
- R2
- coefficient of determination
- KT
- the slope of the relationship between Ψb(50) and temperatures when T exceeds To
- Tc(50)
- ceiling temperature to germination of 50%. The value of Tc(50) was calculated by parameters found after fitting the HTT model at supra-optimal T (Eq. (6))