Mechanistic insights into passive plant movements by synchrotron X-ray scattering
Peter Fratzl, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
Mechanical behavior of plant tissues is largely determined by the nano-architecture of the cell wall components and, in particular, by the cellulose micro-fibril angle. In addition to controlling the stiffness of plant materials, these fiber architectures are also responsible for the passive actuation of seed capsules and other non-living plant bodies [1,2]. Micro-focus x-ray scattering is providing information on the local cellulose fiber orientation [3] and, thus, helps elucidating the mechanisms by which plant tissues tolerate and generate mechanical forces. The examples of wheat awns [4], stork’s bill awns [5] and ice plant seed capsules [6] will be discussed. The basis for stress generation is the interaction of cellulose and other cell wall components with water and these are investigated both theoretically [7] and experimentally by in-situ x-ray diffraction [8].
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