Radial microfibril arrangements in wood cell walls

2022 | journal article. A publication with affiliation to the University of Göttingen.

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​Radial microfibril arrangements in wood cell walls​
Maaß, M. C. ; Saleh, S.; Militz, H.   & Volkert, C. A. ​ (2022) 
Planta256(4).​ DOI: https://doi.org/10.1007/s00425-022-03976-2 

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Authors
Maaß, Mona C. ; Saleh, Salimeh; Militz, Holger ; Volkert, Cynthia A. 
Abstract
Abstract Main conclusion TEM and AFM imaging reveal radial orientations and whorl-like arrangements of cellulose microfibrils near the S1/S2 interface. These are explained by wrinkling during lamellar cell growth. Abstract In the most widely accepted model of the ultrastructure of wood cell walls, the cellulose microfibrils are arranged in helical patterns on concentric layers. However, this model is contradicted by a number of transmission electron microscopy (TEM) studies which reveal a radial component to the microfibril orientations in the cell wall. The idea of a radial component of the microfibril directions is not widely accepted, since it cannot easily be explained within the current understanding of lamellar cell growth. To help clarify the microfibril arrangements in wood cell walls, we have investigated various wood cell wall sections using both transmission electron microscopy and atomic force microscopy, and using various imaging and specimen preparation methods. Our investigations confirm that the microfibrils have a radial component near the interface between the S1 and S2 cell wall layers, and also reveal a whorl-like microfibril arrangement at the S1/S2 interface. These whorl-like structures are consistent with cell wall wrinkling during growth, allowing the radial microfibril component to be reconciled with the established models for lamellar cell growth.
Issue Date
2022
Journal
Planta 
Organization
Fakultät für Forstwissenschaften und Waldökologie ; Burckhardt-Institut ; Abteilung Holzbiologie und Holzprodukte 
ISSN
0032-0935
eISSN
1432-2048
Language
English
Sponsor
Niedersächsische Ministerium für Wissenschaft und Kultur http://dx.doi.org/10.13039/100011937
Georg-August-Universität Göttingen http://dx.doi.org/10.13039/501100003385

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