Aquaporin channel activity
nounPronunciation: /ˌækwəˈpɔrɪn ˈtʃænəl ækˈtɪvɪti/
The functional capacity of aquaporin proteins to facilitate rapid, selective transport of water and small solutes across cell membranes. Aquaporin activity is regulated by phosphorylation and pH changes, directly affecting cellular water uptake rates and maintaining turgor under water-limiting conditions.
Plain English
Water-transport proteins in cell membranes that control how quickly water moves in and out of plant cells.
Etymology & History
Usage
"Modulation of aquaporin channel activity enables rapid water redistribution from vacuoles to the apoplast during early drought stress."
Style guide notes: Specify which aquaporin isoform (PIP1, PIP2, TIP) when discussing specific tissues to avoid ambiguity.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
How do aquaporins differ from general cell membrane channels?
Aquaporins selectively transport water molecules with minimal solute passage, whereas general channels allow multiple substance types through.
Can aquaporin activity be regulated quickly?
Yes; phosphorylation and pH-dependent gating allow aquaporin activity to change within minutes in response to stress signals.
Why Test Candidates on This?
Relevant for advanced assessments covering molecular mechanisms of water stress responses and cellular water dynamics.
Required skill level: Senior