Table 3.
Sirius cultivar parameters used for designing wheat ideotypes for raising genetic yield potentials under the 2050-climate, and genetic variations observed in those parameters for wheat.
| Parameters | Symbol | Unit | Range used in model optimization | Genetic variation | Reference |
|---|---|---|---|---|---|
| Phenology | |||||
| Phyllochron | Ph | ºC day | 70–120 | ≤20% | Ishag et al. (1998); Mosaad et al. (1995) |
| Day length response | Pp | Leaf h−1day length | 0.065–0.900 | 9.74–107.40* | Kosner and Zurkova (1996) |
| Duration of grain filling | Gf | ºC day | 500–900 | ≤40% | Akkaya et al. (2006); Charmet et al. (2005); Robert et al. (2001) |
| Canopy | |||||
| Maximum area of flag leaf | AMax | m2 leaf m−2 soil | 0.005–0.01 | ≤40% | Fischer et al. (1998); Shearman et al. (2005) |
| Stay green | SG | – | 0.00–1.50 | ||
| Root water uptake | |||||
| Rate of root water uptake | Ru | % | 1.0–5.0 | Large variation | Asseng et al. (1998); Manschadi et al. (2006) |
| Drought tolerance | |||||
| Response of photosynthesis to water stress | Wsa | – | 0.1–1.0 | ||
| Maximum acceleration of leaf senescence due to water stress | Wss | – | 1.0–1.7 | ||
*
Varietal difference in number of days till heading under long- and short-day conditions found between 9.74 and 107.40 in a photoperiodic response experiment (Kosner and Zurkova, 1996).