Table 2.
The net CO2 assimilation rate (AN; μmol m−2 s−1), stomatal conductance to H2O (gs; mol H2O m−2 s−1), mesophyll conductance to CO2 (gm; mol CO2 m−2 s−1) and leaf-intrinsic water use efficiency (WUEi calculated as AN/gs ratio; μmol CO2 mol−1 H2O) in flag leaves of four wheat genotypes under well-watered (WW; RWC = 80–100%), mild stressed (MS; RWC = 60–80%) and severe stressed (SS; RWC = 40–60%) conditions.
| AN | gs | gm | WUE | ||
|---|---|---|---|---|---|
| GK Forrás | WW | 27.61 ± 1.67Aa | 0.43 ± 0.06Ba | 0.45 ± 0.04Ba | 64.52 ± 8.45Ab |
| MS | 16.01 ± 2.25Bb | 0.39 ± 0.08ABb | 0.16 ± 0.06Ab | 42.18 ± 5.51Bc | |
| SS | 7.12 ± 2.11ABc | 0.09 ± 0.06Bc | 0.06 ± 0.02Ac | 124.22 ± 30.79Aa | |
| Pehlivan | WW | 28.64 ± 1.82Aa | 0.50 ± 0.04Aa | 0.73 ± 0.09Aa | 56.87 ± 6.32Aa |
| MS | 19.35 ± 3.38Ab | 0.42 ± 0.04Ab | 0.16 ± 0.08Ab | 48.63 ± 9.83Ba | |
| SS | 4.98 ± 2.19Cc | 0.15 ± 0.04Ac | 0.06 ± 0.03Ac | 52.61 ± 18.67Ba | |
| Piopio-4 | WW | 25.85 ± 1.74Ba | 0.46 ± 0.06Ba | 0.24 ± 0.03Ca | 57.00 ± 3.79Aa |
| MS | 16.16 ± 2.25Bb | 0.37 ± 0.04Bb | 0.09 ± 0.02Bb | 46.26 ± 9.01Ba | |
| SS | 5.65 ± 2.32BCc | 0.11 ± 0.08ABc | 0.05 ± 0.01Ac | 33.88 ± 6.45Cb | |
| Šamorínska | WW | 26.39 ± 1.10Ba | 0.45 ± 0.06Ba | 0.44 ± 0.07Ba | 58.79 ± 6.72Aa |
| MS | 17.00 ± 2.43ABb | 0.29 ± 0.08Cb | 0.12 ± 0.03ABb | 64.11 ± 18.00Aa | |
| SS | 8.44 ± 2.11Ac | 0.13 ± 0.04ABc | 0.06 ± 0.01Ac | 61.42 ± 11.97Ba |
The data are the means ± S.E. (n = 12–20).
S.E.–standard error. superscript: large letters (A,B,C) denote significant differences at p < 0.05 obtained by Duncan's post hoc test among all wheat genotypes at a given stress level (WW, MS or SS), and small letters (a,b,c) indicate statistical differences among all stress levels for a given genotype.