ion sequestration
nounPronunciation: /ˈaɪ.ɑn ˈsɛkwɪstreɪʃən/
The active compartmentalization of excess ions, particularly Na⁺ and Cl⁻, into vacuoles via tonoplast transporters to minimize their cytoplasmic concentration and prevent enzymatic inhibition and protein denaturation. This mechanism is fundamental to salinity tolerance in halophytic and salt-excluding glycophytic plants.
Plain English
The process of storing harmful salt ions away in plant cell vacuoles to protect sensitive cellular machinery.
Etymology & History
Usage
"Ion sequestration into vacuoles allows salt-tolerant barley varieties to maintain cytoplasmic pH and enzyme functionality despite saline soil conditions."
Style guide notes: Specify ion type (Na⁺, Cl⁻) and compartment (vacuole, plastid) when describing sequestration mechanisms.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What transporters mediate ion sequestration into vacuoles?
NHX (Na⁺/H⁺ exchanger) and HKT transporters actively pump ions across the tonoplast membrane.
How does ion sequestration differ from salt exclusion?
Exclusion prevents ion uptake at roots; sequestration removes ions after uptake into vacuoles.
Why Test Candidates on This?
Critical for salt stress physiology and essential for breeding salt-tolerant crops in salinized agricultural regions.
Required skill level: Senior