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Título: | Modulation of K+ translocation by AKT1 and AtHAK5 in Arabidopsis plants |
Autor: | Nieves-Cordones, Manuel CSIC ORCID ; Lara, Alberto; Ródenas, Reyes; Amo, Jesús; Rivero, Rosa M. CSIC ORCID CVN ; Martínez, Vicente CSIC ORCID; Rubio, Francisco CSIC ORCID | Palabras clave: | AKT1 AtHAK5 K+ retrieval from xylem K+ translocation K+ uptake SKOR |
Fecha de publicación: | ago-2019 | Editor: | John Wiley & Sons | Citación: | Plant Cell and Environment 42(8): 2357-2371 (2019) | Resumen: | Root cells take up K+ from the soil solution, and a fraction of the absorbed K+ is translocated to the shoot after being loaded into xylem vessels. K+ uptake and translocation are spatially separated processes. K+ uptake occurs in the cortex and epidermis whereas K+ translocation starts at the stele. Both uptake and translocation processes are expected to be linked, but the connection between them is not well characterized. Here, we studied K+ uptake and translocation using Rb+ as a tracer in wild-type Arabidopsis thaliana and in T-DNA insertion mutants in the K+ uptake or translocation systems. The relative amount of translocated Rb+ to the shoot was positively correlated with net Rb+ uptake rates, and the akt1 athak5 T-DNA mutant plants were more efficient in their allocation of Rb+ to shoots. Moreover, a mutation of SKOR and a reduced plant transpiration prevented the full upregulation of AtHAK5 gene expression and Rb+ uptake in K+-starved plants. Lastly, Rb+ was found to be retrieved from root xylem vessels, with AKT1 playing a significant role in K+-sufficient plants. Overall, our results suggest that K+ uptake and translocation are tightly coordinated via signals that regulate the expression of K+ transport systems | Versión del editor: | https://doi.org/10.1111/pce.13573 | URI: | http://hdl.handle.net/10261/344463 | DOI: | 10.1111/pce.13573 | ISSN: | 0140-7791 | E-ISSN: | 1365-3040 |
Aparece en las colecciones: | (CEBAS) Artículos |
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Nieves2019PlantCellEnv.pdf | Articulo principal | 632,1 kB | Adobe PDF | Visualizar/Abrir |
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