Journal
PLANT SIGNALING & BEHAVIOR
Volume 4, Issue 4, Pages 265-276Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.4.4.7919
Keywords
NHX-type ion transporters; pH regulation; plant membrane vesicles; potassium homeostasis; salt tolerance
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Funding
- Spanish Plan Nacional I + D + I [BIO2005-0878, BIO200801691]
- Consejeria de Innovacion Ciencia y Empresa, Junta de Andalucia [AGR2005436]
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Although physiological and biochemical data since long suggested that Na+/H+ and K+/H+ antiporters are involved in intracellular ion and pH regulation in plants, it has taken a long time to identify genes encoding antiporters that could fulfil these roles. Genome sequencing projects have now shown that plants contain a very large number of putative Cation/Proton antiporters, the function of which is only beginning to be studied. The intracellular NHX transporters constitute the first Cation/Proton exchanger family studied in plants. The founding member, AtNHX1, was identified as an important salt tolerance determinant and suggested to catalyze Na+ accumulation in vacuoles. It is, however, becoming increasingly clear, that this gene and other members of the family also play crucial roles in pH regulation and K+ homeostasis, regulating processes from vesicle trafficking and cell expansion to plant development.
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