ε in these two species was similar at every developmental stages, although the apparent mechanical strength of the leaf lamina and thickness of mesophyll cell walls were greater in Q. The results showed that ε increased from approximately 5 to 20 MPa during leaf development, although other potential determinants of ε such as the apoplastic water content in the leaf and the diameter of a palisade tissue cells remained almost constant. ![]() We compared ε and Young’s modulus of leaf specimens determined by the stretch technique at various stages of their leaf development. ![]() serrata, an evergreen and a deciduous broad-leaved tree species, respectively. The plants used were Quercus glauca and Q. We examined the relationship between the bulk elastic modulus (ε) of an individual leaf obtained by the pressure–volume (P–V) technique and the mechanical properties of cell walls in the leaf.
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