Interactions between callose and cellulose revealed through the analysis of biopolymer mixtures

Radwa H. Abou-Saleh, Mercedes C. Hernandez-Gomez, Sam Amsbury, Candelas Paniagua, Matthieu Bourdon, Shunsuke Miyashima, Ykä Helariutta, Martin Fuller, Tatiana Budtova, Simon D. Connell, Michael E. Ries () and Yoselin Benitez-Alfonso ()
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Radwa H. Abou-Saleh: University of Leeds
Mercedes C. Hernandez-Gomez: University of Leeds
Sam Amsbury: University of Leeds
Candelas Paniagua: University of Leeds
Matthieu Bourdon: University of Cambridge
Shunsuke Miyashima: Nara Institute of Science and Technology
Ykä Helariutta: University of Cambridge
Martin Fuller: University of Leeds
Tatiana Budtova: PSL Research University
Simon D. Connell: University of Leeds
Michael E. Ries: University of Leeds
Yoselin Benitez-Alfonso: University of Leeds

Nature Communications, 2018, vol. 9, issue 1, 1-13

Abstract: Abstract The properties of (1,3)-β-glucans (i.e., callose) remain largely unknown despite their importance in plant development and defence. Here we use mixtures of (1,3)-β-glucan and cellulose, in ionic liquid solution and hydrogels, as proxies to understand the physico-mechanical properties of callose. We show that after callose addition the stiffness of cellulose hydrogels is reduced at a greater extent than predicted from the ideal mixing rule (i.e., the weighted average of the individual components’ properties). In contrast, yield behaviour after the elastic limit is more ductile in cellulose-callose hydrogels compared with sudden failure in 100% cellulose hydrogels. The viscoelastic behaviour and the diffusion of the ions in mixed ionic liquid solutions strongly indicate interactions between the polymers. Fourier-transform infrared analysis suggests that these interactions impact cellulose organisation in hydrogels and cell walls. We conclude that polymer interactions alter the properties of callose-cellulose mixtures beyond what it is expected by ideal mixing.

Date: 2018
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DOI: 10.1038/s41467-018-06820-y

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