Molecular Plant Advance Access published online on September 4, 2009
Molecular Plant, doi:10.1093/mp/ssp065
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Pectin May Hinder the Unfolding of Xyloglucan Chains during Cell Deformation: Implications of the Mechanical Performance of Arabidopsis Hypocotyls with Pectin Alterations
a Max-Planck-Institute of Colloids and Interfaces, Department of Biomaterials, Potsdam, Germany
b College of Forestry and Natural Resources, University of the Philippines Los Baños, Philippines
c Department of Socio-Environmental Energy Science, Kyoto University, Japan
d Max-Planck-Institute for Molecular Plant Physiology, Potsdam, Germany
e Laboratoire de Biologie Cellulaire, UR501, Institute Jean-Pierre Bourgin, INRA, Versailles, France
f Michigan State University, Plant Research Laboratory, East Lansing, Michigan, USA
1 To whom correspondence should be addressed. E-mail ingo.burgert{at}mpikg.mpg.de, fax +49 331 567 9402.
Plant cell walls, like a multitude of other biological materials, are natural fiber-reinforced composite materials. Their mechanical properties are highly dependent on the interplay of the stiff fibrous phase and the soft matrix phase and on the matrix deformation itself. Using specific Arabidopsis thaliana mutants, we studied the mechanical role of the matrix assembly in primary cell walls of hypocotyls with altered xyloglucan and pectin composition. Standard microtensile tests and cyclic loading protocols were performed on mur1 hypocotyls with affected RGII borate diester cross-links and a hindered xyloglucan fucosylation as well as qua2 exhibiting 50% less homogalacturonan in comparison to wild-type. As a control, wild-type plants (Col-0) and mur2 exhibiting a specific xyloglucan fucosylation and no differences in the pectin network were utilized. In the standard tensile tests, the ultimate stress levels (
tensile strength) of the hypocotyls of the mutants with pectin alterations (mur1, qua2) were rather unaffected, whereas their tensile stiffness was noticeably reduced in comparison to Col-0. The cyclic loading tests indicated a stiffening of all hypocotyls after the first cycle and a plastic deformation during the first straining, the degree of which, however, was much higher for mur1 and qua2 hypocotyls. Based on the mechanical data and current cell wall models, it is assumed that folded xyloglucan chains between cellulose fibrils may tend to unfold during straining of the hypocotyls. This response is probably hindered by geometrical constraints due to pectin rigidity.
Key Words: Arabidopsis thaliana • mutants • cellulose • xyloglucan • pectin • cyclic loading tests