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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

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Molecular Plant 2009年第5期2卷 990-999页

作者： Willie Abasolo Michaela Eder Kazuchika Yamauchi Nicolai Obel antje reinecke Lutz Neumetzler John W.C. Dunlop Gregory Mouille Markus Pauly Herman Hofte Ingo Burgert Max-Planck-lnstitute of Colloids and Interfaces Department of Biomaterials Potsdam Germany College of Forestry and Natural Resources University of the Philippines Los Banos Philippines Department of Socio-Environmental Energy Science Kyoto University Japan Max-Planck-lnstitute for Molecular Plant Physiology Potsdam Germany Laboratoire de Biologie Cellulaire UR501 Institute Jean-Pierre Bourgin INRA Versailles France Michigan State University Plant Research Laboratory East Lansing Michigan USA

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 tour1 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 tour1 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.

关键词： Arabidopsis thaliana mutants cellulose xyloglucan pectin cyclic loading tests.

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