Please use this identifier to cite or link to this item: http://cicy.repositorioinstitucional.mx/jspui/handle/1003/1389
Mechanisms of salt tolerance in habanero pepper plants (Capsicum chinense Jacq.): proline accumulation, ions dynamics and sodium root-shoot partition and compartmentation
Emanuel Bojorquez Quintal
ANA MARIA VELARDE BUENDIA
ANGELA FRANCISCA KU GONZALEZ
MILDRED RUBI CARRILLO PECH
DANIELA ORTEGA CAMACHO
Ileana de la Caridad Echevarría Machado
IGOR POTTOSIN
Manuel Martínez Estévez
Acceso Abierto
Atribución-NoComercial-SinDerivadas
10.3389/fpls.2014.00605
H+-ATPASEION FLUXES
PEPPER
POTASSIUM RETENTION
PROLINE ACCUMULATION
ROOTS
SALT TOLERANCE
SODIUM COMPARTMENTALIZATION
Despite its economic relevance, little is known about salt tolerance mechanisms in pepper plants. To address this question, we compared differences in responses to NaCl in two Capsicum chinense varieties: Rex (tolerant) and Chichen-Itza (sensitive). Under salt stress (150 mM NaCl over 7 days) roots of Rex variety accumulated 50 times more compatible solutes such as proline compared to Chichen-Itza. Mineral analysis indicated that Na(+) is restricted to roots by preventing its transport to leaves. Fluorescence analysis suggested an efficient Na(+) compartmentalization in vacuole-like structures and in small intracellular compartments in roots of Rex variety. At the same time, Na(+) in Chichen-Itza plants was compartmentalized in the apoplast, suggesting substantial Na(+) extrusion. Rex variety was found to retain more K(+) in its roots under salt stress according to a mineral analysis and microelectrode ion flux estimation (MIFE). Vanadate-sensitive H(+) efflux was higher in Chichen-Itza variety plants, suggesting a higher activity of the plasma membrane H(+)-ATPase, which fuels the extrusion of Na(+), and, possibly, also the re-uptake of K(+). Our results suggest a combination of stress tolerance mechanisms, in order to alleviate the salt-induced injury. Furthermore, Na(+) extrusion to apoplast does not appear to be an efficient strategy for salt tolerance in pepper plants.
12-11-2014
Artículo
Frontiers in plant science, 5, p. 605, 2014.
Inglés
Bojórquez-Quintal, E., Velarde-Buendía, A., Ku-González, Á., Carillo-Pech, M., Ortega-Camacho, D., Echevarría-Machado, I., ... & Martínez-Estévez, M. (2014). Mechanisms of salt tolerance in habanero pepper plants (Capsicum chinense Jacq.): proline accumulation, ions dynamics and sodium root-shoot partition and compartmentation. Frontiers in plant science, 5, p. 605.
BIOLOGÍA Y QUÍMICA
Versión publicada
publishedVersion - Versión publicada
Appears in Collections:Artículos de Investigación Arbitrados

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