Spatial correlation of water distribution and fine structure of arabinoxylans in the developing wheat grain.
Carbohydr Polym
; 294: 119738, 2022 Oct 15.
Article
en En
| MEDLINE
| ID: mdl-35868742
ABSTRACT
This study was to investigate the distribution of water and arabinoxylan structures in growing wheat grain using two complementary imaging techniques, magnetic resonance microimaging (µMRI) and mass spectrometry imaging (MSI). µMRI showed an inhomogeneous water distribution, particularly at early stages. This heterogeneity revealed histological differences that corresponded, within the limits of resolution of µMRI, to tissues with specific physiological functions, including the vascular bundles, the cavity and the endosperm periphery. All of these tissues had a higher water content than the central endosperm. MSI revealed distinct xylan structures in these regions with high levels of Araf substitution around the cavity and acetylated xylans concentrated at the endosperm periphery. For the first time, acetylation and Araf substitution of arabinoxylans were found by image processing to spatially correlate with water distribution in planta. Acetylation and Araf substitution of xylans, which alter chain-chain interactions and increase wall porosity, decreased as the grain matured.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Triticum
/
Xilanos
Idioma:
En
Revista:
Carbohydr Polym
Año:
2022
Tipo del documento:
Article