Lignin deposition
nounPronunciation: /ˈlɪɡnɪn ˌdɛpəˈzɪʃən/
The synthesis and accumulation of lignin polymers in plant cell walls and vascular tissues in response to abiotic stress, particularly mechanical stress and pathogen pressure. This process strengthens cellular structures and enhances water transport efficiency through increased cell wall rigidity and reduced pathogen penetration.
Plain English
Plants deposit tough woody material in cell walls to strengthen them when stressed or threatened.
Etymology & History
Usage
"Increased lignin deposition in root tissues improves mechanical strength and water uptake under compacted soil conditions."
Style guide notes: Specify tissue types and stress conditions when discussing lignin deposition; distinguish from cellulose deposition.
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Frequently Asked Questions
What enzymes catalyze lignin synthesis?
Phenylpropanoid pathway enzymes including phenylalanine ammonia-lyase and peroxidases drive lignin polymer formation.
How does lignin improve stress tolerance?
Lignin strengthens cell walls, improves water transport efficiency, and creates physical barriers against pathogens.
Why Test Candidates on This?
Important for understanding structural plant adaptations to mechanical and environmental stress conditions.
Required skill level: Junior