Journal
REVIEWS OF MODERN PHYSICS
Volume 88, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/RevModPhys.88.035007
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Funding
- Danish Council for Independent Research-Natural Sciences
- Carlsberg Foundation
- Villum Fonden [13166]
- Harvard MRSEC [DMR-1420570]
- AFOSR [FA9550-09-1-0188]
- NSF [IOS-1456845]
- Danish Council for Independent Research-Natural Science Grant [12-126055]
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1456845] Funding Source: National Science Foundation
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Green plants are Earth's primary solar energy collectors. They harvest the energy of the Sun by converting light energy into chemical energy stored in the bonds of sugar molecules. A multitude of carefully orchestrated transport processes are needed to move water and minerals from the soil to sites of photosynthesis and to distribute energy-rich sugars throughout the plant body to support metabolism and growth. The long-distance transport happens in the plants' vascular system, where water and solutes are moved along the entire length of the plant. In this review, the current understanding of the mechanism and the quantitative description of these flows are discussed, connecting theory and experiments as far as possible. The article begins with an overview of low-Reynolds-number transport processes, followed by an introduction to the anatomy and physiology of vascular transport in the phloem and xylem. Next, sugar transport in the phloem is explored with attention given to experimental results as well as the fluid mechanics of osmotically driven flows. Then water transport in the xylem is discussed with a focus on embolism dynamics, conduit optimization, and couplings between water and sugar transport. Finally, remarks are given on some of the open questions of this research field.
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