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Conference papers

Natural variation in the polysaccharide components of Arabidopsis seed coat epidermal cells

Abstract : During Arabidopsis seed differentiation the epidermal cells of the testa produce a variety of cell wall structures. Fully differentiated cells are characterised by reinforced proximal and radial cell walls and a central columella of secondary cell wall material, a distal primary cell wall, and mucilage polysaccharides surrounding the columella. The latter are released on imbibition to form a hydrogel that surrounds the seed. We have previously shown that Arabidopsis mucilage is formed of a mixture of polysaccharides in two structurally distinct layers, both of which are mainly composed of the pectin rhamnogalacturonan I [1]. A simple visual screen for the absence of mucilage release has allowed the identification of natural Arabidopsis variants affected in two novel loci that influence polysaccharide properties; the MUM2 beta–galactosidase and the PMEI6 pectin methylesterase [2, 3, 4]. Most Arabidopsis accessions release mucilage when imbibed and we have examined the extent of natural variability in soluble mucilage characteristics. Mucilage composition varied little between accessions; in contrast the amount and physicochemical properties of mucilage vary widely. Analyses have been carried out to link these variations with particular habitats and potential mucilage functions.
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Submitted on : Wednesday, June 3, 2020 - 12:15:43 PM
Last modification on : Friday, September 3, 2021 - 3:32:02 PM


  • HAL Id : hal-02747713, version 1
  • PRODINRA : 357031



Helen North, Marie-Christine Ralet, Susana Saez Aguayo, Joseph Tran, Dominique Poulain, et al.. Natural variation in the polysaccharide components of Arabidopsis seed coat epidermal cells. 13. Cell Wall Meeting, Institut National de Recherche Agronomique (INRA). UR Biopolymères, Interactions Assemblages (1268)., Jul 2013, Nantes, France. ⟨hal-02747713⟩