Cellular dehydration tolerance threshold
noun phrasePronunciation: /ˈsɛljʊlər ˌdiːhaɪˈdreɪʃən ˈtɒlərəns ˈθrɛʃəʊld/
The minimum cellular water content below which a plant cell loses turgor and experiences irreversible damage or programmed cell death. This threshold varies among species and is critical for defining stress severity and plant survival capacity during water deficit conditions.
Plain English
The lowest water level a plant cell can reach before permanent damage or death occurs.
Etymology & History
Usage
"Species with lower cellular dehydration tolerance thresholds exhibit greater desiccation avoidance rather than tolerance mechanisms."
Style guide notes: Specify measurement units (typically expressed as percentage of fresh weight water content) when reporting thresholds.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
How is cellular dehydration tolerance threshold measured experimentally?
Researchers measure water loss progression versus cell viability using electrolyte leakage assays and microscopy observations.
Do different cell types have different dehydration thresholds?
Yes, guard cells and root cortex cells typically tolerate lower water content than leaf mesophyll cells in most species.
Why Test Candidates on This?
Relevant for advanced research seminars and graduate-level examinations focusing on cellular mechanisms of drought tolerance.
Required skill level: Senior