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Titolo:
A glimpse of the mechanisms of ion homeostasis during salt stress
Autore:
Serrano, R; Mulet, JM; Rios, G; Marquez, JA; de Larrinoa, IF; Leube, MP; Mendizabal, I; Pascual-Ahuir, A; Proft, M; Ros, R; Montesinos, C;
Indirizzi:
Univ Politecn Valencia, Inst Biol Mol & Celular Plantas, CSIC, Valencia 46022, Spain Univ Politecn Valencia Valencia Spain 46022 CSIC, Valencia 46022, Spain
Titolo Testata:
JOURNAL OF EXPERIMENTAL BOTANY
, volume: 50, anno: 1999,
pagine: 1023 - 1036
SICI:
0022-0957(199906)50:<1023:AGOTMO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
YEAST PLASMA-MEMBRANE; PROTEIN PHOSPHATASE CALCINEURIN; AFFINITY POTASSIUM TRANSPORTER; NA+/H+ ANTIPORT ACTIVITY; RECTIFYING K+ CHANNEL; CASEIN KINASE-I; 2 PORE DOMAINS; P-TYPE ATPASE; SACCHAROMYCES-CEREVISIAE; H+-ATPASE;
Keywords:
potassium transport; sodium transport; protein kinases; protein phosphatases; transcription factors;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
154
Recensione:
Indirizzi per estratti:
Indirizzo: Serrano, R Univ Politecn Valencia, Inst Biol Mol & Celular Plantas, CSIC, Camino VeraS-N, Valencia 46022, Spain Univ Politecn Valencia Camino Vera S-N Valencia Spain 46022 in
Citazione:
R. Serrano et al., "A glimpse of the mechanisms of ion homeostasis during salt stress", J EXP BOT, 50, 1999, pp. 1023-1036

Abstract

Cells respond to salt stress by osmolyte synthesis and by increase of K+ uptake and Na+ efflux at the plasma membrane and of Na+ accumulation at the vacuole. This cellular level of response has been approached by the molecular genetics of Saccharomyces cerevisiae. Two plasma membrane proteins, SIn1and Sho1, operate as sensors for turgor loss under mild osmotic stress, They activate the Hog1 MAP kinase which induces several defence genes, including the ENA1 Na+-efflux pump. Hog1-mediated induction occurs by inactivation of the Sko1 repressor. High concentrations of Na+ activate the calcium-dependent protein phosphatase calcineurin, which induces the ENA1 gene via the positive transcription factor HaI8/Crz1/Tcn1. Vacuoles could operate as Na+ sensors through a Na+-Ca2+ exchange mechanism, The electrical potential of the plasma membrane is a major determinant of the uptake of toxic cations, including Na+, by non-specific leakage pathways. This biophysical parameter is modulated by the concerted activities of the proton pumping Pma1 ATPase and the Trk1,2 K+ uptake system. Both calcineurin and the protein kinase HaI4,5 modulate Trk1,2 and, indirectly, the membrane potential and salt tolerance. The limiting role of vacuolar cation accumulation in salt tolerance has been demonstrated by expression in yeast vacuoles of the bacterial antiporter NhaA.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 08:40:52