Table 2.
Sirius cultivar parameters used for designing wheat ideotypes under the future 2050 climate scenario (based on HAdGEM2 and RCP8.5), and genetical variation observed in those parameters
| No. | Parameters | Symbol | Unit | Range used in model optimization | Genetical variation observed for wheat | Reference |
|---|---|---|---|---|---|---|
| 1 | Phyllochron | Ph | °C day | 80–130 | ≤20% | Ishag et al. (1998), Mosaad et al. (1995) |
| 2 | Day length response | Pp | Leaf h−1 day length | 0.05–0.70 | 9.74–107.40a | Kosner and Zurkova (1996) |
| 3 | Duration of grain filling | Gf | °C day | 500–900 | ≤40% | Akkaya et al. (2006), Charmet et al. (2005), Robert et al. (2001) |
| 4 | Maximum area of flag leaf | A | m2 leaf m−2 soil | 0.003–0.01 | ≤40% | Fischer et al. (1998), Shearman et al. (2005) |
| 5 | Stay green | SG | — | 0.0–1.5 | ||
| 6 | Rate of root water uptake | Ru | % | 1.0–7.0 | Large variation | Asseng et al. (1998), Manschadi et al. (2006) |
| 7 | Response of photosynthesis to water stress | Wsa | — | 0.1–2.1 | ||
| 8 | Maximum acceleration of leaf senescence due to water stress | Wss | — | 1.2–1.9 |
a Varietal difference in number of days till heading under long and short day conditions varied between 9.74 and 107.40 in a photoperiodic response experiment.