stomatal density variation
nounPronunciation: /stəˈmeɪtəl ˈdɛnsɪti ˌvɛriˈeɪʃən/
The phenotypic plasticity and genetic variation in the number of functional stomata per unit leaf area in response to environmental conditions during development. Stomatal density directly influences maximum stomatal conductance and represents a key morphological adaptation to variable water availability.
Plain English
Differences in the number of leaf pores per unit area, which affects how much water a plant loses and carbon dioxide it absorbs.
Etymology & History
Usage
"Stomatal density variation among maize accessions explained 34% of the phenotypic differences in water-use efficiency under drought conditions."
Style guide notes: Clearly specify measurement units (stomata per mm² or cm²) and whether counting adaxial, abaxial, or total leaf surfaces.
Also known as
Contrasted with
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Frequently Asked Questions
Is stomatal density fixed or does it change with environment?
Stomatal density is developmentally plastic, increasing under high CO2 and decreasing under water stress during leaf formation.
Why is stomatal density important for crop breeding?
Lower stomatal density reduces water loss in dry environments while higher density increases photosynthetic capacity in humid conditions.
Why Test Candidates on This?
Frequently measured in crop phenotyping and natural variation studies; increasingly used as indirect selection criterion in breeding programs.
Required skill level: Mid