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Artículo

Silencing of the tomato Sugar Partitioning Affecting protein (SPA) modifies sink strength through a shift in leaf sugar metabolism

Bermudez Salazar, Luisa FernandaIcon ; de Godoy, Fabiana; Baldet, Pierre; Demarco, Diego; Osorio, Sonia; Quadrana, Leandro DanielIcon ; Almeida de Souza, Juliana Beatriz; Asis, RamónIcon ; Gibon, Yves; Fernie, Alisdair; Rossi, Maria Magdalena; Carrari, Fernando OscarIcon
Fecha de publicación: 02/2014
Editorial: Wiley
Revista: Plant Journal
ISSN: 0960-7412
e-ISSN: 1365-313X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

Limitations in our understanding about the mechanisms underlying source-sink assimilate partitioning are increasingly becoming a major hurdle for crop yield enhancement via metabolic engineering. By means of a comprehensive approach, this work reports the functional characterization of a DnaJ chaperone related-protein (named as SPA; sugar partition-affecting) involved in assimilate partitioning in tomato plants. SPA protein was found to be targeted to the chloroplast thylakoid membranes. SPA-RNAi tomato plants produced more and heavier fruits, thus resulting in a considerable increment in harvest index. The transgenic plants also displayed increased pigment levels and reduced sucrose, glucose and fructose contents in leaves. Detailed metabolic and enzymatic activities analyses showed that sugar phosphate intermediates are increased while the activity of phosphoglucomutase, sugar kinases and invertases are reduced in the photosynthetic organs of the silenced plants. These changes would be anticipated to promote carbon export from foliar tissues. The combined results suggest that the tomato SPA protein plays an important role in plastid metabolism and mediates the source-sink relationships by affecting the rate of carbon translocation to fruits.
Palabras clave: Tomato , Small Plastidial Protein , Fruit Metabolism , Source-Sink Partitioning , Chloroplast Metabolism
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/31869
URL: http://onlinelibrary.wiley.com/doi/10.1111/tpj.12418/abstract
DOI: http://dx.doi.org/10.1111/tpj.12418
Colecciones
Articulos(CIBICI)
Articulos de CENTRO DE INV.EN BIOQUI.CLINICA E INMUNOLOGIA
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Carrari, Fernando Oscar; Rossi, Maria Magdalena; Fernie, Alisdair; Gibon, Yves; Asis, Ramón; Almeida de Souza, Juliana Beatriz; et al.; Silencing of the tomato Sugar Partitioning Affecting protein (SPA) modifies sink strength through a shift in leaf sugar metabolism; Wiley; Plant Journal; 77; 5; 2-2014; 676-687
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