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Plant Sci. 2018 Nov;276:199-207. doi: 10.1016/j.plantsci.2018.08.022. Epub 2018 Sep 5.

Ferulate and lignin cross-links increase in cell walls of wheat grain outer layers during late development.

Author information

1
UR1268 BIA (Biopolymères Interactions Assemblages), INRA, 44300, Nantes, France. Electronic address: anne-laure.chateigner-boutin@inra.fr.
2
Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France. Electronic address: catherine.lapierre@inra.fr.
3
UR1268 BIA (Biopolymères Interactions Assemblages), INRA, 44300, Nantes, France. Electronic address: camille.alvarado@inra.fr.
4
Laboratory of Tree Cell Biology, Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan. Electronic address: yoshinaga.arata.5a@kyoto-u.ac.jp.
5
UMR1208 IATE, INRA, CIRAD, Montpellier SupAgro, Univ Montpellier, Montpellier, France. Electronic address: cecile.barron@inra.fr.
6
UR1268 BIA (Biopolymères Interactions Assemblages), INRA, 44300, Nantes, France. Electronic address: bj.bouchet@orange.fr.
7
UR1268 BIA (Biopolymères Interactions Assemblages), INRA, 44300, Nantes, France. Electronic address: benedicte.bakan@inra.fr.
8
UR1268 BIA (Biopolymères Interactions Assemblages), INRA, 44300, Nantes, France. Electronic address: luc.saulnier@inra.fr.
9
UR1268 BIA (Biopolymères Interactions Assemblages), INRA, 44300, Nantes, France. Electronic address: marie-francoise.devaux@inra.fr.
10
INRA UMR1095 GDEC (Génétique Diversité Ecophysiologie des Céréales), INRA, 63000, Clermont-Ferrand, France; UBP, UMR 1095 GDEC (Génétique Diversité Ecophysiologie des Céréales), INRA, 63000, Clermont-Ferrand, France. Electronic address: christine.girousse@inra.fr.
11
UR1268 BIA (Biopolymères Interactions Assemblages), INRA, 44300, Nantes, France. Electronic address: fabienne.guillon@inra.fr.

Abstract

Important biological, nutritional and technological roles are attributed to cell wall polymers from cereal grains. The composition of cell walls in dry wheat grain has been well studied, however less is known about cell wall deposition and modification in the grain outer layers during grain development. In this study, the composition of cell walls in the outer layers of the wheat grain (Triticum aestivum Recital cultivar) was investigated during grain development, with a focus on cell wall phenolics. We discovered that lignification of outer layers begins earlier than previously reported and long before the grain reaches its final size. Cell wall feruloylation increased in development. However, in the late stages, the amount of ferulate releasable by mild alkaline hydrolysis was reduced as well as the yield of lignin-derived thioacidolysis monomers. These reductions indicate that new ferulate-mediated cross-linkages of cell wall polymers appeared as well as new resistant interunit bonds in lignins. The formation of these additional linkages more specifically occurred in the outer pericarp. Our results raised the possibility that stiffening of cell walls occur at late development stages in the outer pericarp and might contribute to the restriction of the grain radial growth.

KEYWORDS:

Cell wall; Developing pericarp; Ferulic acid; Grain size; Lignins; Wheat grain

PMID:
30348319
DOI:
10.1016/j.plantsci.2018.08.022
[Indexed for MEDLINE]
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