Related Experiment Video
Updated: Oct 9, 2026

A Telemetric, Gravimetric Platform for Real-Time Physiological Phenotyping of Plant–Environment Interactions
Published on: August 5, 2020
Daily time course of whole-shoot gas exchange rates in two drought-exposed Mediterranean shrubs
S Nogués1, S Munné-Bosch, J Casadesús
1Departament de Biologia Vegetal, Universitat de Barcelona, Spain.
Abstract:
Effects of drought on water relations, whole-shoot gas-exchange characteristics, and pigment and zeatin concentrations were investigated in the Mediterranean shrubs rosemary (Rosmarinus officinalis L.) and lavender (Lavandula stoechas L.). Two-year-old, greenhouse-grown plants were placed in a whole-shoot gas-exchange measurement system and subjected to 10 days of drought, resulting in severe water stress, and then re-watered for 5 days in order to study their recovery. Water stress resulted in a significant decline in maximum whole-shoot net CO2 assimilation rates (An) for both species that was associated with reductions in leaf area and stomatal conductance. Because shoot dark respiration rate (Rd) was less sensitive to water stress than An, shoot Rd/An ratio increased from about 15 to 95% during water stress. No major changes in chlorophyll and carotenoid concentrations of rosemary leaves were observed during the experiments, but chlorophyll and carotenoid concentrations fell significantly in water-stressed lavender leaves. Zeatin concentrations were higher in rosemary leaves than in lavender leaves during water stress. After re-watering, whole-shoot An and Rd rapidly recovered to their pre-drought rates.
Related Concept Videos
Adaptations that Reduce Water Loss
Regulation of Transpiration by Stomata
C4 Pathway and CAM
C4 Pathway
The C4 pathway is used by plants such as...
Responses to Drought and Flooding
Biological Clocks and Seasonal Responses
Epiphytes, Parasites, and Carnivores

