Figure 2.

Vulnerability curves for loss of conduction (PLC) in stem, midrib, and whole leaf during dehydration of Prunus laurocerasus shoots. A, Shows K per unit leaf area versus Ψ_L. Stem segments were current-year and typically had scares from three excised leaves and were measured by the vacuum chamber method; hence, the pressure gradient was not as well defined as in conventional stem segments without leaf scares (milligrams m⁻² s⁻¹ MPa⁻¹). Therefore, conductance values were computed with the same units as midribs and whole leaves. B, Shows PLC versus Ψ_L. Error bars are ses of the mean; n = 5 to 8.