Table II. Water potential at 50 and 88% loss of leaf hydraulic conductance (Pk50 and Pk88; MPa), and 12% of cellular lysis (P12CL; MPa).
Thresholds were computed after fitting the reparameterized Weibull function (Ogle et al., 2009) to vulnerability curves. Values are means (MPa) and 95% confidence intervals. Letters indicate significant differences in each row (P < 0.05).
| Species | Leaf Hydraulic Vulnerability |
Electrolyte Leakage |
|
|---|---|---|---|
| Pk50 | Pk88 | P12CL | |
| R. bulbosus (dry) | −0.57 (−0.63, −0.48) a | −1.53 (<−1.55, −1.31) a | −1.11 (−1.53, −0.84) a |
| R. lanuginosus (humid) | −0.15 (−0.19, −0.10) b | −0.44 (−0.60, −0.35) b | −1.16 (−1.47, −0.88) a |
| R. acris (dry) | −0.82 (−1.08, −0.54) a | −3.27 (<−3.27, −2.64) c | −2.02 (−2.43, −1.64) b |
| R. acris (humid) | −0.73 (−0.93, −0.50) a | −2.84 (<−3.15, −2.25) c | −2.02 (−2.29, −1.62) b |