Ion Homeostasis in NaCl Stress Environments
- 1 November 1995
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 109 (3) , 735-742
- https://doi.org/10.1104/pp.109.3.735
Abstract
8 pages, 1 figure, 1 table, 60 references.Homeostasis can be defined as the tendency of a cell or\ud an organism to maintain interna1 steady state, even in\ud response to any environmental perturbation or stimulus\ud tending to disturb normality, because of the coordinate responses of its constituent components. Typically, ions constantly flux in and out of cells in a controlled fashion with net flux adjusted to accommodate cellular requirements, thus creating an ionic homeostasis. When plant cells are exposed to salinity, mediated by high NaCl concentra- tions, kinetic steady states of ion transport for Na+ and C1- and other ions, such as Kt and Ca2+,are disturbed (Binzel et al., 1988).High apoplastic levels of Na+ and C1- alter aqueous and ionic thermodynamic equilibria, resulting in hyperosmotic stress, ionic imbalance, and toxicity. Thus, it is vital for the plant to re-establish cellular ion homeostasis for metabolic functioning and growth, that is, to adapt to the saline environment.This research was supported in part by U.S. Department of Agriculture/National Research Initiative Competitive Grants Program grant No. 92-37100 -7738, and by Comision Interministerial de Ciencia y Tecnología grant No. BI094-0622.Peer revieweKeywords
This publication has 34 references indexed in Scilit:
- The Plasma Membrane H+-ATPase (A Highly Regulated Enzyme with Multiple Physiological Functions)Plant Physiology, 1995
- Isolation of Multiple cDNAs Encoding the Vacuolar H+-ATPase Subunit B from Developing Cotton (Gossypium hirsutum L.) OvulesPlant Physiology, 1994
- Perspectives on the Physiology and Structure of Inward-Rectifying K+ Channels in Higher Plants: Biophysical Implications for K+ UptakeAnnual Review of Biophysics, 1994
- Two cDNA Clones Encoding Isoforms of the B Subunit of the Vacuolar ATPase from Barley RootsPlant Physiology, 1994
- Plasma-membrane H+-ATPase gene expression is regulated by NaCl in cells of the halophyte Atriplex nummularia L.Planta, 1993
- De Novo Synthesis of Plasma Membrane and Tonoplast Polypeptides of Barley Roots during Short-Term K+ DeprivationPlant Physiology, 1992
- Induction of a Putative Ca2+-ATPase mRNA in NaCl-Adapted CellsPlant Physiology, 1992
- Nucleotide Sequence of a Complementary DNA Encoding Plasma Membrane H+-ATPase from Rice (Oryza sativa L.)Plant Physiology, 1992
- Stretch-activated chloride, potassium, and calcium channels coexisting in plasma membranes of guard cells of Vicia faba L.Planta, 1991
- TRK1 encodes a plasma membrane protein required for high-affinity potassium transport in Saccharomyces cerevisiae.Molecular and Cellular Biology, 1988