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Miart F, Fournet F, Dubrulle N, Petit E, Demailly H, Dupont L, Zabijak L, Marcelo P, Boudaoud A, Pineau C, Guénin S, Van Wuytswinkel O, Mesnard F, Pageau K. Cytological Approaches Combined With Chemical Analysis Reveals the Layered Nature of Flax Mucilage. Front Plant Sci 2019; 10:684. [PMID: 31293601 PMCID: PMC6598216 DOI: 10.3389/fpls.2019.00684] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 05/06/2019] [Indexed: 05/28/2023]
Abstract
The external seed coat cell layer of certain species is specialized in the production and extrusion of a polysaccharide matrix called mucilage. Variations in the content of the released mucilage have been mainly associated with genetically regulated physiological modifications. Understanding the mucilage extrusion process in crop species is of importance to gain deeper insight into the complex cell wall biosynthesis and dynamics. In this study, we took advantage of the varying polysaccharide composition and the size of the flax mucilage secretory cells (MSCs) to study mucilage composition and extrusion in this species of agricultural interest. We demonstrate herein that flax MSCs are structured in four superimposed layers and that rhamnogalacturonans I (RG I) are firstly synthesized, in the upper face, preceding arabinoxylan and glucan synthesis in MSC lower layers. Our results also reveal that the flax mucilage release originates from inside MSC, between the upper and deeper layers, the latter collaborating to trigger polysaccharide expansion, radial cell wall breaking and mucilage extrusion in a peeling fashion. Here, we provide evidence that the layer organization and polysaccharide composition of the MSCs regulate the mucilage release efficiency like a peeling mechanism. Finally, we propose that flax MSCs may represent an excellent model for further investigations of mucilage biosynthesis and its release.
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Affiliation(s)
- Fabien Miart
- Unité Biologie des Plantes et Innovation, EA-3900, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
| | - Françoise Fournet
- Unité Biologie des Plantes et Innovation, EA-3900, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
| | - Nelly Dubrulle
- Reproduction et Développement des Plantes, Université de Lyon, École Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Lyon, France
| | - Emmanuel Petit
- Unité Biologie des Plantes et Innovation, EA-3900, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
| | - Hervé Demailly
- Centre de Ressources Régionales en Biologie Moléculaire, UFR des Sciences, Amiens, France
| | - Loic Dupont
- Laboratoire de Réactivité et de Chimie des Solides, CNRS UMR 7314, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
| | - Luciane Zabijak
- Plateforme d’Ingénierie Cellulaire et d’Analyses des Protéines, Centre Universitaire de Recherche en Santé, Amiens, France
| | - Paulo Marcelo
- Plateforme d’Ingénierie Cellulaire et d’Analyses des Protéines, Centre Universitaire de Recherche en Santé, Amiens, France
| | - Arezki Boudaoud
- Reproduction et Développement des Plantes, Université de Lyon, École Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, Institut National de la Recherche Agronomique, Centre National de la Recherche Scientifique, Lyon, France
| | - Christophe Pineau
- Unité Biologie des Plantes et Innovation, EA-3900, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
| | - Stéphanie Guénin
- Centre de Ressources Régionales en Biologie Moléculaire, UFR des Sciences, Amiens, France
| | - Olivier Van Wuytswinkel
- Unité Biologie des Plantes et Innovation, EA-3900, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
| | - François Mesnard
- Unité Biologie des Plantes et Innovation, EA-3900, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
| | - Karine Pageau
- Unité Biologie des Plantes et Innovation, EA-3900, Université de Picardie Jules Verne, UFR des Sciences, Amiens, France
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