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Plant and Cell Physiology Advance Access originally published online on March 29, 2006
Plant and Cell Physiology 2006 47(6):715-725; doi:10.1093/pcp/pcj042
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The Bulk Elastic Modulus and the Reversible Properties of Cell Walls in Developing Quercus Leaves

Takami Saito1,*, Kouichi Soga2, Takayuki Hoson2 and Ichiro Terashima1

1 Department of Biology, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043 Japan
2 Department of Biological Sciences, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585 Japan

* Corresponding author: E-mail, takami{at}bio.sci.osaka-u.ac.jp; Fax, +81-6-6850-5808.

We examined the relationship between the bulk elastic modulus ({varepsilon}) of an individual leaf obtained by the pressure–volume (P–V) technique and the mechanical properties of cell walls in the leaf. The plants used were Quercus glauca and Q. serrata, an evergreen and a deciduous broad-leaved tree species, respectively. We compared {varepsilon} and Young’s modulus of leaf specimens determined by the stretch technique at various stages of their leaf development. The results showed that {varepsilon} increased from approximately 5 to 20 MPa during leaf development, although other potential determinants of {varepsilon} such as the apoplastic water content in the leaf and the diameter of a palisade tissue cells remained almost constant. {varepsilon} 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. glauca. There were significant linear relationships between Young’s modulus and {varepsilon} (P < 0.01; R 2 = 0.78 and 0.84 in Q. glauca and Q. serrata, respectively) with small y-intercepts. From these results, we conclude that {varepsilon} is closely related to the reversible properties of the cell walls. From the estimation of {varepsilon} based on a physical model, we suggest that the effective thickness of cell walls responsible for {varepsilon} is smaller than the observed wall thickness.

(Received March 2, 2006; Accepted March 20, 2006)
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T. Saito, B. P. Naiola, and I. Terashima
Conservative Decrease in Water Potential in Existing Leaves during New Leaf Expansion in Temperate and Tropical Evergreen Quercus Species
Ann. Bot., November 1, 2007; 100(6): 1229 - 1238.
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