Smaller stomata require less severe leaf drying to close: a case study in Rosa hydrida.
Habtamu Giday1, Katrine H Kjaer, Dimitrios Fanourakis
1Department of Food Science, Århus University, Kirstinebjergvej 10, DK-5792 Årslev, Denmark. habtamu.giday@agrsci.dk
Journal of Plant Physiology
|June 4, 2013
Summary
Stomatal size in roses influences water loss regulation. Larger stomata in high humidity-grown plants lead to greater water loss and altered responses to drying, impacting plant survival.
Area of Science:
- Plant Physiology
- Plant Ecology
- Horticulture
Background:
- Stomatal development is influenced by relative air humidity (RH).
- Plants grown at high RH exhibit altered stomatal characteristics and water loss regulation.
- Intraspecific variation in stomatal traits affects plant responses to environmental stress.
Purpose of the Study:
- To quantify the contribution of stomatal response characteristics to water loss in high RH-grown plants.
- To assess the relationship between stomatal response characteristics and intraspecific variation in stomatal size.
- To understand how stomatal size influences transpiration regulation during water deprivation in roses.
Main Methods:
- Analysis of stomatal size, density, responsiveness to desiccation, and pore dimensions in ten rose cultivars grown at moderate (60%) or high (85%) RH.
- Assessment of leaf morphological components and transpiration rates under growth conditions.
- Quantification of relative water content (RWC) and stable transpiration following desiccation.
Main Results:
- High RH growth led to thinner leaves with larger areas and significantly altered stomatal characteristics.
- Stomatal size was a key determinant of pore area and varied significantly among cultivars.
- High RH-grown plants showed reduced transpiration decline upon desiccation, linked to stomatal size, higher stable transpiration, and lower RWC at which stable transpiration occurred.
Conclusions:
- Stomatal size is a major factor explaining intraspecific variation in transpiration regulation during water deprivation in roses.
- Altered stomatal traits in high RH-grown plants impact water loss and drought response.
- Understanding stomatal plasticity is crucial for breeding roses adapted to varying humidity conditions.
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Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...