Cuticle thickening response
nounPronunciation: /ˈkjuːtɪkəl ˈθɪkənɪŋ rɪˈspɑːns/
The adaptive increase in epicuticular and intracuticular waxy deposition on leaf and stem surfaces triggered by exposure to drought, high light, or low humidity conditions. This structural modification reduces non-stomatal water loss and enhances UV protection, forming a critical first-line barrier against multiple environmental stresses.
Plain English
Plants thicken the waxy protective layer on their leaves and stems to reduce water loss and block damaging light.
Etymology & History
Usage
"Cuticle thickening response is particularly pronounced in Mediterranean shrubs, reducing transpiration losses by up to 30% during summer drought."
Style guide notes: Distinguish between 'epicuticular' (outermost) and 'intracuticular' (embedded within cuticle) wax deposition for anatomical precision.
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Related Terms
Frequently Asked Questions
Is cuticle thickening reversible after stress removal?
Partially; while wax composition can change, the structural thickness is largely retained on existing leaves.
What chemical compounds increase in the cuticle during thickening?
Alkanes, alcohols, aldehydes, and ketones increase substantially, with composition varying by species and stress type.
Why Test Candidates on This?
Assessed in specialized plant morphology and drought physiology evaluations, particularly for xerophyte adaptation studies.
Required skill level: Mid