Please use this identifier to cite or link to this item: http://cicy.repositorioinstitucional.mx/jspui/handle/1003/1540
Molecular cloning and functional analysis of a Na + -insensitive K + transporter of Capsicum chinense Jacq
NANCY RUIZ LAU
Emanuel Bojorquez Quintal
BEGOÑA BENITO CASADO
Ileana de la Caridad Echevarría Machado
Lucila Aurelia Sánchez Cach
María de Fátima Medina Lara
Manuel Martínez Estévez
Acceso Abierto
Atribución-NoComercial-SinDerivadas
10.3389/fpls.2016.01980
CAPSICUM CHINENSE
HAK-TYPE TRANSPORTER
K+-STARVATION
POTASSIUM
ROOTS
SODIUM
High-affinity K+ (HAK) transporters are encoded by a large family of genes and are ubiquitous in the plant kingdom. These HAK-type transporters participate in low- and high-affinity potassium (K+) uptake and are crucial for the maintenance of K+ homeostasis under hostile conditions. In this study, the full-length cDNA of CcHAK1 gene was isolated from roots of the habanero pepper (Capsicum chinense). CcHAK1 expression was positively regulated by K+ starvation in roots and was not inhibited in the presence of NaCl. Phylogenetic analysis placed the CcHAK1 transporter in group I of the HAK K+ transporters, showing that it is closely related to Capsicum annuum CaHAK1 and Solanum lycopersicum LeHAK5. Characterization of the protein in a yeast mutant deficient in high-affinity K+ uptake (WΔ3) suggested that CcHAK1 function is associated with high-affinity K+ uptake, with Km and Vmax for Rb of 50 μM and 0.52 nmol mg−1 min−1, respectively. K+ uptake in yeast expressing the CcHAK1 transporter was inhibited by millimolar concentrations of the cations ammonium (NH+4) and cesium (Cs+) but not by sodium (Na+). The results presented in this study suggest that the CcHAK1 transporter may contribute to the maintenance of K+ homeostasis in root cells in C. chinense plants undergoing K+-deficiency and salt stress.
2019
Artículo
Frontiers in plant science, 7, 1980.
Inglés
Ruiz-Lau, N., Bojórquez-Quintal, E., Benito, B., Echevarría-Machado, I., Sánchez-Cach, L. A., Medina-Lara, M. D. F., & Martínez-Estévez, M. (2016). Molecular cloning and functional analysis of a Na+-insensitive K+ transporter of Capsicum chinense Jacq. Frontiers in plant science, 7, 1980.
BIOLOGÍA Y QUÍMICA
Versión publicada
publishedVersion - Versión publicada
Appears in Collections:Artículos de Investigación Arbitrados

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