Cell wall loosening mechanism
nounPronunciation: /sel wɔːl ˈluːsnɪŋ ˈmɛkənɪzəm/
The enzymatic and biochemical processes that reduce cell wall rigidity, allowing continued cell expansion under stress conditions through weakening of polysaccharide cross-links. This adaptive response enables growth under limited water availability by reducing the turgor pressure required for cell elongation.
Plain English
The process where plant cell walls become more flexible, allowing cells to grow even when water is scarce.
Etymology & History
Usage
"Cell wall loosening mechanisms in maize roots facilitate continued growth under mild water deficit stress."
Style guide notes: Specify the tissue type (root, stem, leaf) when discussing cell wall loosening mechanisms.
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Frequently Asked Questions
How does cell wall loosening help plants under drought stress?
Softening cell walls reduces turgor pressure needed for expansion, enabling root growth toward water sources.
What enzymes regulate cell wall loosening?
Expansins and other hydrolases weaken hemicellulose cross-links, reducing wall resistance to expansion forces.
Why Test Candidates on This?
Important for understanding plant morphological adaptations and root system responses to drought stress.
Required skill level: Senior