The Possible Role of Non-Structural Carbohydrates in the Regulation of Tree Hydraulics
Open Access
- 24 December 2019
- journal article
- review article
- Published by MDPI AG in International Journal of Molecular Sciences
- Vol. 21 (1), 144
- https://doi.org/10.3390/ijms21010144
Abstract
The xylem is a complex system that includes a network of dead conduits ensuring long-distance water transport in plants. Under ongoing climate changes, xylem embolism is a major and recurrent cause of drought-induced tree mortality. Non-structural carbohydrates (NSC) play key roles in plant responses to drought and frost stress, and several studies putatively suggest their involvement in the regulation of xylem water transport. However, a clear picture on the roles of NSCs in plant hydraulics has not been drawn to date. We summarize the current knowledge on the involvement of NSCs during embolism formation and subsequent hydraulic recovery. Under drought, sugars are generally accumulated in xylem parenchyma and in xylem sap. At drought-relief, xylem functionality is putatively restored in an osmotically driven process involving wood parenchyma, xylem sap and phloem compartments. By analyzing the published data on stem hydraulics and NSC contents under drought/frost stress and subsequent stress relief, we found that embolism build-up positively correlated to stem NSC depletion, and that the magnitude of post-stress hydraulic recovery positively correlated to consumption of soluble sugars. These findings suggest a close relationship between hydraulics and carbohydrate dynamics. We call for more experiments on hydraulic and NSC dynamics in controlled and field conditions.Keywords
This publication has 126 references indexed in Scilit:
- Investigating xylem embolism formation, refilling and water storage in tree trunks using frequency domain reflectometryJournal of Experimental Botany, 2013
- Maintenance of xylem Network Transport Capacity: A Review of Embolism Repair in Vascular PlantsFrontiers in Plant Science, 2013
- Analysis of Xylem Sap from Functional (Nonembolized) and Nonfunctional (Embolized) Vessels of Populus nigra: Chemistry of RefillingPlant Physiology, 2012
- Transcriptome Response to Embolism Formation in Stems of Populus trichocarpa Provides Insight into Signaling and the Biology of RefillingPlant Physiology, 2011
- The Dynamics of Embolism Repair in Xylem: In Vivo Visualizations Using High-Resolution Computed TomographyPlant Physiology, 2010
- Xylem function and growth rate interact to determine recovery rates after exposure to extreme water deficitNew Phytologist, 2010
- A Central Role of Abscisic Acid in Stress-Regulated Carbohydrate MetabolismPLOS ONE, 2008
- Whole‐tree water transport scales with sapwood capacitance in tropical forest canopy treesPlant, Cell & Environment, 2003
- Selection pressures on stomatal evolutionNew Phytologist, 2002
- Trends in wood density and structure are linked to prevention of xylem implosion by negative pressureOecologia, 2001