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Table II
Mean (SE) of relative water content, osmotic potential at turgor loss point, osmotic potential at saturation, modulus elasticity at saturation and cuticular transpiration of seedlings from seven western redcedar populations before and after drought. Population means for each parameter that do not share the same letter are significantly different (P < 0.05 Fisher’s LSD test). See Table I for population details.
| 2 | 4 | 11 | 12 | 16 | 19 | 23 | |||
|---|---|---|---|---|---|---|---|---|---|
| Population number | Population name | Yellowpoint | Nicolum | Garibaldi | Kennedy lake | Oliver lake | Gilpin | Creston | |
| (RWCtlp) Relative water content at turgor loss point (%) | |||||||||
| Before drought | 83.6a (0.6) | 86.8b (1.1) | 81.9a (0.7) | 82.5a (1.4) | 83.4a (0.9) | 83.8ab (1.3) | 82.2a (1.2) | ||
| After drought | 80.1a (1.5) | 79.2a (1.1) | 79.6a (2.2) | 81.3a (0.9) | 82.9a (1.0) | 79.9a (0.9) | 78.4a (1.2) | ||
| (Ψtlp) Osmotic potential at turgor loss point (MPa) | |||||||||
| Before drought | –1.357a (0.030) | –1.456a (0.077) | –1.336a (0.069) | –1.348a (0.037) | –1.365a (0.065) | –1.419a (0.050) | –1.396a (0.039) | ||
| After drought | –1.697ab (0.65) | –1.597b (0.071) | –1.765ab (0.149) | –1.576b (.103) | –1.713ab (0.058) | –1.894a (0.024) | –1.899a (0.107) | ||
| (Ψsat) Osmotic potential at saturation (MPa) | |||||||||
| Before drought | –1.073a (0.023) | –1.235a (0.087) | –0.995a (0.093) | –1.054a (0.067) | –1.082a (0.076) | –1.145a (0.053) | –1.106a (0.017) | ||
| After drought | –1.195b (0.067) | –1.204ab (0.061) | –1.25ab (0.044) | –1.126b (0.104) | –1.409a (0.053) | –1.251ab (0.071) | –1.368a (0.059) | ||
| (εmax) Modulus of elasticity at saturation (MPa) | |||||||||
| Before drought | 6.7a (0.5) | 8.8a (0.8) | 6.1a (0.6) | 6.6a (0.8) | 7.1a (0.6) | 7.0a (0.4) | 6.9a (0.4) | ||
| After drought | 5.5a (0.4) | 6.0a (0.5) | 7.2a (0.8) | 7.5a (0.5) | 8.0a (0.6) | 7.0a (0.9) | 7.0a (0.7) | ||
| (TFDcuticular) Cuticular transpiration (mg h−1 gdw−1) | |||||||||
| Before drought | 78a (7) | 122a (19) | 78a (8) | 97a (21) | 67a (7) | 86a (14) | 82a (8) | ||
| After drought | 118ab (22) | 98ab (11) | 95ab (26) | 165b (13) | 134ab (17) | 108ab (17) | 61a (14) | ||