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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

From: Alien chromosome segment from Aegilops speltoides and Dasypyrum villosum increases drought tolerance in wheat via profuse and deep root system

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***
  1. *** indicates P ≤ 0.001