title: Expression of MsPG3-GFP fusions in Medicago truncatula'hairy roots' reveals preferential tip localization of the protein in root hairs.
abstract: Tip growth is a specialized type of polar growth where new cell wall is deposited in a localized region of the cell, the growing tip. These cells show a characteristic zonation, with a high accumulation of secretory vesicles containing cell wall components at the tip, followed by an organelle-enriched zone. MsPG3 is a Medicago sativa polygalacturonase gene isolated in our laboratory, specifically expressed during the interaction of this plant with its symbiotic partner Sinorhizobium meliloti and which might participate in tip growth processes during symbiosis. We have used MsPG3-GFP fusions to study in vivo protein transport processes and localization during root hair growth. Different MsPG3-GFP fusions were expressed in Medicago truncatula'hairy roots' following a protocol developed for this study and also tested by transient expression in onion epidermal cells. Preferential accumulation of an MsPG3-GFP fusion protein in the tip of the growing root hair at different developmental stages was found, confirming the delivery of MsPG3 to the newly synthesized cell wall. This indicates that this protein may participate in tip growth processes during symbiosis and, in addition, that this fusion could be a useful tool to study this process in plants.
authors.affiliation: Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Sevilla, Spain.
authors.forename: Ignacio D
authors.initials: ID
authors.lastname: Rodríguez-Llorente
authors.forename: Javier
authors.initials: J
authors.lastname: Pérez-Hormaeche
authors.forename: Mohammed
authors.initials: M
authors.lastname: Dary
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Caviedes
authors.forename: Adam
authors.initials: A
authors.lastname: Kondorosi
authors.forename: Pascal
authors.initials: P
authors.lastname: Ratet
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Palomares
mesh_terms: D018014:Gene Transfer Techniques; D017930:Genes, Reporter; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000235:genetics*; D029902:Medicago / Q000235:genetics* / Q000378:metabolism; D019697:Onions / Q000378:metabolism; D019441:Plant Epidermis / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D011096:Polygalacturonase / Q000235:genetics*; D021381:Protein Transport / Q000502:physiology; D011993:Recombinant Fusion Proteins / Q000235:genetics
chemical_list: D008164:Luminescent Proteins; D011993:Recombinant Fusion Proteins; D049452:Green Fluorescent Proteins; D011096:Polygalacturonase