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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Unravelling the impact of lignin on cell wall mechanics: a comprehensive study on young poplar trees downregulated for CINNAMYL ALCOHOL DEHYDROGENASE (CAD)

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Ozparpucu, Merve ; Ruggeberg, Markus ; Gierlinger, Notburga ; Cesarino, Igor ; Vanholme, Ruben ; Boerjan, Wout ; Burgert, Ingo
Total Authors: 7
Document type: Journal article
Source: Plant Journal; v. 91, n. 3, p. 480-490, AUG 2017.
Web of Science Citations: 15

Lignin engineering is a promising tool to reduce the energy input and the need of chemical pre-treatments for the efficient conversion of plant biomass into fermentable sugars for downstream applications. At the same time, lignin engineering can offer new insight into the structure-function relationships of plant cell walls by combined mechanical, structural and chemical analyses. Here, this comprehensive approach was applied to poplar trees (Populus tremulaxPopulus alba) downregulated for CINNAMYL ALCOHOL DEHYDROGENASE (CAD) in order to gain insight into the impact of lignin reduction on mechanical properties. The downregulation of CAD resulted in a significant decrease in both elastic modulus and yield stress. As wood density and cellulose microfibril angle (MFA) did not show any significant differences between the wild type and the transgenic lines, these structural features could be excluded as influencing factors. Fourier transform infrared spectroscopy (FTIR) and Raman imaging were performed to elucidate changes in the chemical composition directly on the mechanically tested tissue sections. Lignin content was identified as a mechanically relevant factor, as a correlation with a coefficient of determination (r(2)) of 0.65 between lignin absorbance (as an indicator of lignin content) and tensile stiffness was found. A comparison of the present results with those of previous investigations shows that the mechanical impact of lignin alteration under tensile stress depends on certain structural conditions, such as a high cellulose MFA, which emphasizes the complex relationship between the chemistry and mechanical properties in plant cell walls. (AU)

FAPESP's process: 15/02527-1 - Development of model systems in sorghum and a systems biology approach to unravel the molecular mechanisms controlling lignin metabolism in grasses
Grantee:Igor Cesarino
Support type: Program for Research on Bioenergy (BIOEN) - Young Investigators Grants