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Plant and Cell Physiology Advance Access published online on March 29, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj042
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received March 2, 2006
Accepted March 20, 2006

Regular Paper

The Bulk Elastic Modulus and the Reversible Properties of Cell Walls in Developing Quercus Leaves

Takami Saito 1 *, Kouichi Soga 2, Takayuki Hoson 2, and Ichiro Terashima 1

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

* To whom correspondence should be addressed.
Takami Saito, E-mail: takami{at}bio.sci.osaka-u.ac.jp


  Abstract

We examined the relationship between the bulk elastic modulus of an individual leaf ({epsilon}) obtained by the pressure-volume (P-V) technique and the mechanical properties of cell walls in the leaf. Plants used were Quercus glauca and Q. serrata, an evergreen and a deciduous broad-leaved tree species. We compared {epsilon} and Young's modulus of leaf specimens determined by the stretch technique at various stages of their leaf development. The results showed that {epsilon} increased from approximately 5 to 20 MPa during leaf development, although other potential determinants of {epsilon} such as the apoplastic water content in the leaf and the diameter of the palisade tissue cells remained almost constant. {epsilon} in these two species were similar at any developmental stage, 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 {epsilon} (P < 0.01; R2 = 0.78 and 0.84 in Q. glauca and Q. serrata, respectively) with small y-intercepts. From these results, we conclude that the {epsilon} closely relates to the reversible properties of the cell walls. From the estimation of {epsilon} based on a physical model, we suggest that the effective thickness of cell walls responsible for {epsilon} is smaller than observed wall thickness.

Keywords: bulk elastic modulus; Instron technique; pressure-volume (P-V) curve; reversible properties of cell walls; stress-strain curve; Young's modulus.
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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.
[Abstract] [Full Text] [PDF]


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