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01:46The Apoplast and Symplast
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Phloem transport and drought.
1Earth and Environmental Sciences Division, Los Alamos National Laboratory, Bikini Atoll Road MS J495, Los Alamos, NM 87545, USA.
Journal of Experimental Botany
|January 17, 2014
Summary
Drought impairs plant water transport by causing xylem embolism and potentially phloem failure. Phloem failure may occur due to viscosity or turgor loss, with turgor collapse being more likely in many plants.
Area of Science:
- Plant Physiology
- Plant Vascular Biology
- Drought Stress Responses
Background:
- Drought significantly impacts plant water uptake, leading to xylem embolism and hydraulic failure.
- Phloem transport under drought conditions remains poorly understood due to measurement challenges.
- Phloem and xylem tissues are hydraulically connected, suggesting drought affects phloem water status.
Purpose of the Study:
- To review and model phloem transport under drought stress.
- To elucidate potential mechanisms of phloem transport failure during drought.
- To identify factors influencing the dominant phloem failure mechanism.
Main Methods:
- Application of phloem transport theories to drought scenarios.
- Analysis of water status and viscosity changes in phloem conduits.
Keywords:
Carbohydrate transportMünch flowcarbon starvationhydraulic failuresemi-permeable conduittree mortality.More Related Videos
Main Results:
- Phloem failure can result from increased viscosity at source sites or loss of phloem turgor.
- The hydraulic permeability of phloem conduit walls determines the dominant failure mechanism.
- Impermeable walls favor viscosity build-up, while permeable walls promote turgor failure.
Conclusions:
- Phloem turgor collapse is suggested as the more probable failure mechanism in isohydric plants.
- Understanding phloem hydraulics is crucial for predicting plant drought survival.
- Drought stress poses a significant threat to phloem function and overall plant health.