Abscisic Acid Sensitivity Threshold
nounPronunciation: /ˌæbsɪˈzɪk ˈæsɪd ˈsɛnsɪtɪvɪti ˈθrɛʃhoʊld/
The minimum concentration of abscisic acid required to trigger stress-responsive physiological changes in plant cells or tissues. Variation in this threshold among genotypes influences the speed and intensity of stress responses.
Plain English
How much stress hormone a plant needs to activate its defense mechanisms against environmental threats.
Etymology & History
Usage
"Drought-tolerant cultivars demonstrated lower ABA sensitivity thresholds, enabling earlier stomatal closure and water conservation."
Style guide notes: Use 'ABA sensitivity' as shorthand; specify tissue type and stress condition when comparing thresholds between studies.
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Contrasted with
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Frequently Asked Questions
How do plants differ in ABA sensitivity?
Genetic variations in ABA receptor genes and signaling components alter receptor affinity and downstream response speed.
Why is lower ABA sensitivity threshold advantageous?
Earlier hormonal response activation allows faster stomatal closure and defensive enzyme induction before severe damage occurs.
Why Test Candidates on This?
Important for plant breeding, molecular genetics, and physiological stress response research.
Required skill level: Senior