Leaf hydraulic vulnerability protects stem functionality under drought stress in Salvia officinalis
Tadeja Savi1, Maria Marin1, Jessica Luglio1
1Dipartimento di Scienze della Vita, Università di Trieste, Via L. Giorgieri 10, 34127 Trieste, Italia.
Functional Plant Biology : FPB
|June 3, 2020
Summary
Salvia officinalis exhibits drought tolerance through vulnerability segmentation, where leaves lose water transport efficiency before stems. This strategy helps maintain high photosynthetic efficiency during summer drought.
Area of Science:
- Plant Physiology
- Ecology
- Botany
Background:
- Functional coordination between leaf and stem hydraulics is crucial for drought-resistant plants.
- Balancing water transport efficiency and safety in different organs is vital for survival in Mediterranean climates.
Purpose of the Study:
- To investigate seasonal changes in leaf and stem water relations of Salvia officinalis.
- To understand the drought survival strategies of this species in harsh environmental conditions.
Main Methods:
- Monitoring seasonal changes in leaf and stem water relations.
- Assessing water potential, photosynthetic efficiency, and hydraulic conductivity (P50).
Main Results:
- During summer drought, Salvia officinalis reduced water loss by dropping below the turgor loss point, maintaining high photosynthetic efficiency.
- Leaves lost water transport efficiency earlier than stems.
- Both organs showed high vulnerability (low P50), suggesting a segmentation strategy for drought tolerance.
- Fast recovery of leaf turgor indicated extra-xylem pathway resistance also contributes to reduced hydraulic conductance.
Conclusions:
- Drought tolerance in Salvia officinalis is partly achieved through vulnerability segmentation between leaves and stems.
- Cell shrinkage and extra-xylem pathway resistance play a significant role in reducing leaf hydraulic conductance during drought.
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