Relative water content (RWC)
nounPronunciation: /ˌreɪlətɪv ˈwɔːtə ˈkɒntent/
The ratio of a plant tissue's current water content to its maximum water-holding capacity at full turgor, expressed as a percentage. RWC serves as a quantitative indicator of plant water status and cell turgor, independent of size or dry weight variations.
Plain English
A percentage showing how much water a plant tissue contains compared to the maximum amount it can hold.
Etymology & History
Usage
"Drought-stressed plants maintained RWC above 60%, indicating sufficient cellular hydration for survival."
Style guide notes: Always express as percentage; clearly define measurement timing (saturated vs. field); note sampling time as diurnal variation occurs.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
How is relative water content calculated?
RWC = [(Fresh weight - Dry weight) / (Turgid weight - Dry weight)] × 100
Why is RWC preferred over absolute water content measurements?
RWC accounts for size and biomass differences, allowing standardized stress comparisons across plant samples.
Why Test Candidates on This?
Fundamental, easy-to-measure indicator of stress severity; standard in drought and salt stress studies.
Required skill level: Junior