A stomatal safety-efficiency trade-off constrains responses to leaf dehydration
Christian Henry1, Grace P John1,2, Ruihua Pan1,3
1Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA.
Nature Communications
|August 1, 2019
Summary
Plants face a safety-efficiency trade-off: high water use efficiency (stomatal conductance) means greater drought sensitivity. This impacts plant growth and ecosystems globally.
Area of Science:
- Plant Physiology
- Ecology
- Biogeochemistry
Background:
- Stomata regulate gas exchange, influencing photosynthesis, plant growth, and water use.
- Stomatal closure is crucial for plant survival during drought conditions.
- Understanding stomatal function is key to predicting plant responses to environmental changes.
Purpose of the Study:
- To investigate the safety-efficiency trade-off in stomatal function.
- To determine how stomatal conductance relates to drought sensitivity across diverse plant species.
- To explore the ecological implications of this trade-off for ecosystems.
Main Methods:
- Experimental analysis of stomatal conductance (gmax) and leaf water potential at 50% conductance reduction (Ψgs50) in California woody species.
- Meta-analysis of existing studies on stomatal responses in various flowering plant species worldwide.
Main Results:
- A significant trade-off exists: species with higher maximum stomatal conductance (gmax) exhibit greater sensitivity to dehydration (higher Ψgs50).
- This safety-efficiency trade-off was consistently observed across different species and geographic locations.
- The findings link stomatal roles in gas exchange and drought defense.
Conclusions:
- The stomatal safety-efficiency trade-off fundamentally constrains leaf water use rates and drought sensitivity.
- This trade-off has significant implications for understanding and predicting ecosystem responses to water availability and climate change.
- Optimizing stomatal function involves balancing carbon gain with hydraulic safety.
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