Should we delay leaf water potential measurements after excision? Dehydration or equilibration?
Alicia V Perera-Castro1,2, Jaime Puértolas3, Beatriz Fernández-Marín3,4
1Department of Botany, Ecology and Plant Physiology, Universidad de La Laguna (ULL), La Laguna, Canary Islands, 38200, Spain. aperera@fg.ull.es.
BMC Plant Biology
|November 8, 2024
Summary
Leaf water potential (Ψw) measurement is not overestimated after excision, as water potential disequilibrium dissipates quickly. Minimizing water loss during storage, especially with a hydrophobic layer, is key for accurate plant water status determination.
Area of Science:
- Plant Physiology
- Plant Water Relations
- Drought Stress Physiology
Background:
- Accurate leaf water potential (Ψw) determination is vital for understanding plant responses to water deficit.
- Post-excision water potential decline has been linked to the equilibration of pre-excision Ψw gradients.
- This study investigates the impact of re-equilibration on Ψw determination.
Purpose of the Study:
- To assess the influence of potential re-equilibration on leaf water potential (Ψw) determination after excision.
- To evaluate different storage methods for minimizing water loss and its effect on Ψw measurement.
- To determine if pre-excision transpiration rates affect post-excision Ψw decline.
Main Methods:
- Monitoring leaf water potential (Ψw) and relative water content decline after excision.
- Employing different leaf storage methods, including covering with a hydrophobic layer (vaseline).
- Comparing Ψw decline under low evaporative demand conditions with varying storage techniques.
Main Results:
- Leaf Ψw decline during storage was significantly reduced by covering leaves with a hydrophobic layer.
- Residual water loss varied among species, potentially due to morpho-physiological traits.
- Pre-excision transpiration rate did not influence the magnitude of post-excision Ψw decline when water loss was minimized.
Conclusions:
- Water potential disequilibrium across a leaf dissipates rapidly after excision, preventing Ψw overestimation.
- Storage under low evaporative demand shows variable effectiveness across species.
- Using a hydrophobic layer is a viable method for preserving leaf water potential during storage.
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