Table 2. Transpiration efficiency related traits and yield in the three groups of 48 wheat varieties.
| Traits | Grouping of 48 wheat varieties | ||
|---|---|---|---|
| Group I | Group II | Group III | |
| SD (No.mm-2) | 49.24±0.15 A | 53.37±0.18 B | 57.79±0.28 C |
| FLA (cm2) | 32.02±0.24 A | 25.69±0.16 B | 20.03±0.28 C |
| A (μmol.m-2 s-1) | 21.54±0.13 Aa | 18.52±0.11 BCb | 16.58±0.09 Cc |
| E (mmol.m-2 s-1) | 2.76±0.03 Aa | 3.70±0.04 BCb | 4.19±0.05 Cc |
| WUEi (μmol.mmol-1) | 6.79±0.07 Aa | 5.67±0.04 BCb | 4.95±0.05 Cc |
| CID (‰) | 21.07±0.09 A | 21.53±0.03 B | 22.17±0.03 C |
| BYPP (g) | 42.46±0.37 A | 33.76±0.38 B | 24.10±0.42 C |
| GYPP (g) | 19.39±0.40 Aa | 14.19±0.24 BCb | 12.68±0.36 Cc |
| HI | 0.46±0.04 | 0.43±0.01 | 0.54±0.02 |
Group I: high TaER expression; Group II: intermediate TaER expression; Group III: low TaER expression. Uppercase and lowercase letters represent significant differences among the three groups (uppercase P< 0.01; lowercase P< 0.05). SD: stomatal density (No. mm-2); FLA: flag leaf area (cm2); A: photosynthetic rate (μmol. m-2 s-1); E: transpiration rate (mmol. m-2 s-1); WUEi: instant water use efficiency (μmol mmol-1); CID: carbon isotopic discrimination (‰); BYPP: biomass yield per plant (g); GYPP: grain yield per plant (g); HI: harvest index.