Table 5.
Range, mean and least significant difference (LSD) for chlorophyll index (SPAD units), thylakoid membrane damage (Fo/Fm ratio; unitless), quantum yield of PSII (ΦPSII; unitless), electron transport rate (μmol electrons m−2 s− 1), seed set percentage, seed yield (g spike− 1), seed number (plant− 1), individual seed weight (mg seed− 1), seed yield (g plant−1) and harvest index (%) of wheat–alien chromosome lines under irrigation (control) and drought stress (water withheld for 16 d) (Experiment 3). *** indicates P ≤ 0.001
| Trait | Irrigated condition | Drought stress | LSD for stress | ||
|---|---|---|---|---|---|
| Range | Mean | Range | Mean | ||
| Chlorophyll index (SPAD units) | 30.0–54.2 | 41.8 | 19.9–49.3 | 31.1 | 0.38*** |
| Thylakoid membrane damage (Fo/Fm ratio; unitless) | 0.140–0.260 | 0.203 | 0.255–0.425 | 0.340 | 0.003*** |
| Quantum yield of PSII (ΦPSII; unitless) | 0.345–0.590 | 0.462 | 0.105–0.465 | 0.262 | 0.005*** |
| Electron transport rate (μmol electrons m−2 s−1) | 197.3–297.6 | 242.2 | 50.6–215.3 | 135.8 | 3.0*** |
| Seed set percentage | 44.5–84.0 | 68.0 | 6.7–59.8 | 32.9 | 0.84*** |
| Seed yield (g spike−1) | 0.12–1.91 | 0.92 | 0.02–1.26 | 0.34 | 0.02*** |
| Seed number (plant−1) | 23.5–133.2 | 57.1 | 2.0–89.0 | 23.0 | 2.1*** |
| Individual seed weight (mg seed− 1) | 6.0–56.0 | 29.6 | 3.9–59.9 | 22.8 | 1.3*** |
| Seed yield (g plant− 1) | 0.17–3.5 | 1.6 | 0.02–2.0 | 0.54 | 0.04*** |
| Harvest index (%) | 2.5–31.3 | 15.2 | 0.18–29.5 | 7.0 | 0.44*** |
*** indicates P ≤ 0.001