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- Title
Grazing-incidence diffraction reveals cellulose and pectin organization in hydrated plant primary cell wall.
- Authors
Del Mundo, Joshua T.; Rongpipi, Sintu; Yang, Hui; Ye, Dan; Kiemle, Sarah N.; Moffitt, Stephanie L.; Troxel, Charles L.; Toney, Michael F.; Zhu, Chenhui; Kubicki, James D.; Cosgrove, Daniel J.; Gomez, Esther W.; Gomez, Enrique D.
- Abstract
The primary cell wall is highly hydrated in its native state, yet many structural studies have been conducted on dried samples. Here, we use grazing-incidence wide-angle X-ray scattering (GIWAXS) with a humidity chamber, which enhances scattering and the signal-to-noise ratio while keeping outer onion epidermal peels hydrated, to examine cell wall properties. GIWAXS of hydrated and dried onion reveals that the cellulose ( 110 / 1 1 ¯ 0 ) lattice spacing decreases slightly upon drying, while the (200) lattice parameters are unchanged. Additionally, the ( 110 / 1 1 ¯ 0 ) diffraction intensity increases relative to (200). Density functional theory models of hydrated and dry cellulose microfibrils corroborate changes in crystalline properties upon drying. GIWAXS also reveals a peak that we attribute to pectin chain aggregation. We speculate that dehydration perturbs the hydrogen bonding network within cellulose crystals and collapses the pectin network without affecting the lateral distribution of pectin chain aggregates.
- Subjects
PLANT cell walls; PECTINS; CELLULOSE; DENSITY functional theory; LATTICE constants; X-ray scattering
- Publication
Scientific Reports, 2023, Vol 13, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-023-32505-8