title: Characterization using Raman microspectroscopy of arabinoxylans in the walls of different cell types during the development of wheat endosperm.
abstract: The time course and pattern of arabinoxylan deposition in the wheat (Triticum aestivum) endosperm during grain development were studied using Raman spectroscopy. The presence of arabinoxylans (AX) is detected at the beginning of grain filling. At this stage, AX appear more substituted than at the later stages. Feruloylation of AX increases during the grain-filling stage, especially in the case of the aleurone layer. Whatever the stage of grain development, four populations of cells could be defined according to Raman arabinoxylan signatures. In the walls of the aleurone cells, AX appeared to be little substituted and highly esterified with phenolic acids. In the walls of prismatic cells, AX were found to be highly substituted and poorly esterified. Apart from aleurone and prismatic cells, the substitution degree of AX in endosperm was in the same range. Cells in the crease region were distinguished from cells in the starchy endosperm by their lower amount of esterified phenolic compounds.
authors.affiliation: INRA-Unité de Recherches Biopolymères, Interactions et Assemblages, B.P. 71627, 44316 Nantes, France.
authors.forename: Sully
authors.initials: S
authors.lastname: Philippe
authors.forename: Cécile
authors.initials: C
authors.lastname: Barron
authors.forename: Paul
authors.initials: P
authors.lastname: Robert
authors.forename: Marie-Françoise
authors.initials: MF
authors.lastname: Devaux
authors.forename: Luc
authors.initials: L
authors.lastname: Saulnier
authors.forename: Fabienne
authors.initials: F
authors.lastname: Guillon
mesh_terms: D002473:Cell Wall / Q000737:chemistry*; D012639:Seeds / Q000254:growth & development* / Q000648:ultrastructure*; D013059:Spectrum Analysis, Raman; D013997:Time Factors; D014908:Triticum / Q000648:ultrastructure*; D014990:Xylans / Q000032:analysis*
chemical_list: D014990:Xylans; C085118:arabinoxylan