Journal
NEW PHYTOLOGIST
Volume 213, Issue 3, Pages 1093-1106Publisher
WILEY
DOI: 10.1111/nph.14273
Keywords
drought resilience; hydraulic redistribution; leaf-level gas exchange; nocturnal transpiration; plant water storage; root water uptake
Categories
Funding
- National Science Foundation [NSF-CBET-103347, NSF-EAR-1344703, NSF-DGE-1068871]
- US Department of Energy (DOE) through the Office of Biological and Environmental Research (BER) Terrestrial Carbon Processes (TCP) program [DE-SC0006967, DE-SC0011461]
- Nicholas School of the Environment at Duke University Seed Grant Initiative
- Division Of Earth Sciences
- Directorate For Geosciences [1344703] Funding Source: National Science Foundation
Ask authors/readers for more resources
In addition to buffering plants from water stress during severe droughts, plant water storage (PWS) alters many features of the spatio-temporal dynamics of water movement in the soil-plant system. How PWS impacts water dynamics and drought resilience is explored using a multi-layer porous media model. The model numerically resolves soil-plant hydrodynamics by coupling them to leaf-level gas exchange and soil-root interfacial layers. Novel features of the model are the considerations of a coordinated relationship between stomatal aperture variation and whole-system hydraulics and of the effects of PWS and nocturnal transpiration (Fe,night) on hydraulic redistribution (HR) in the soil. The model results suggest that daytime PWS usage and Fe,night generate a residual water potential gradient (p,night) along the plant vascular system overnight. This p,night represents a non-negligible competing sink strength that diminishes the significance of HR. Considering the co-occurrence of PWS usage and HR during a single extended dry-down, a wide range of plant attributes and environmental/soil conditions selected to enhance or suppress plant drought resilience is discussed. When compared with HR, model calculations suggest that increased root water influx into plant conducting-tissues overnight maintains a more favorable water status at the leaf, thereby delaying the onset of drought stress.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available