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Please use this identifier to cite or link to this item: http://dspace.utalca.cl/handle/1950/9051

Title: VvBOR1, the Grapevine Ortholog of AtBOR1, Encodes an Efflux Boron Transporter That is Differentially Expressed Throughout Reproductive Development of Vitis vinifera L.
Authors: Perez-Castro, R.
Kasai, K.
Gainza-Cortes, F.
Ruiz-Lara, S.
Casaretto, J.A.
Pena-Cortes, H.
Tapia, J.
Fujiwara, T.
Gonzalez, E.
Keywords: BOR
Boron transporter
Carmenere
Grapes
Parthenocarpic
Vitis
Issue Date: Feb-2012
Publisher: OXFORD UNIV PRESS
Citation: PLANT AND CELL PHYSIOLOGY Volume: 53 Issue: 2 Pages: 485-494
Abstract: Boron (B) is an essential micronutrient for normal development of roots, shoots and reproductive tissues in plants. Due to its role in the structure of rhamnogalacturonan II, a polysaccharide required for pollen tube growth, B deficiency has been associated with the occurrence of parthenocarpic seedless grapes in some varieties of Vitis vinifera L. Despite that, it is unclear how B is mobilized and accumulated in reproductive tissues. Here we describe the characterization of an efflux B transporter, VvBOR1, homolog to AtBOR1, which is involved in B xylem loading in Arabidopsis thaliana roots. VvBOR1-green fluorescent protein (GFP) fusion protein expressed in A. thaliana localizes in the proximal plasma membrane domain in root pericycle cells, and VvBOR1 overexpression restores the wild-type phenotype in A. thaliana bor1-3 mutant plants exposed to B deficiency. Complementation of a mutant yeast strain indicates that VvBOR1 corresponds to a B efflux transporter. Transcriptional analyses during grapevine reproductive development show that the VvBOR1 gene is preferentially expressed in flowers at anthesis and a direct correlation between the expression pattern and B content in grapes was established, suggesting the involvement of this transporter in B accumulation in grapevine berries.
Description: Gonzalez, E (reprint author), Univ Talca, Inst Biol Vegetal & Biotecnol, Talca, Chile.
URI: http://dspace.utalca.cl/handle/1950/9051
ISSN: 0032-0781
Appears in Collections:Artículos en publicaciones ISI - Universidad de Talca

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