Ionic homeostasis
nounPronunciation: /aɪˈɒnɪk hoʊmiəˈoʊstəsɪs/
The maintenance of stable intracellular ion concentrations despite fluctuating external ion availability, mediated by selective membrane transporters and compartmentalization. Disruption of ionic homeostasis during salt stress impairs enzymatic function and cellular osmoregulation.
Plain English
A plant's ability to keep the right balance of salts inside its cells despite salty soil conditions.
Etymology & History
Usage
"Salt-tolerant halophytes maintain ionic homeostasis through enhanced Na+ compartmentalization in vacuoles."
Style guide notes: Differentiate between vacuolar compartmentalization and apoplastic exclusion mechanisms.
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Frequently Asked Questions
Why is ionic homeostasis important under salt stress?
Prevents toxic Na+ accumulation in cytoplasm, maintaining enzyme activity and membrane integrity.
How do plants regulate ionic homeostasis?
Using membrane transporters like Na+/H+ antiporters to exclude or compartmentalize excess ions.
Why Test Candidates on This?
Essential for evaluating salt tolerance breeding targets and understanding halophyte adaptation.
Required skill level: Senior