Populus euphratica counteracts drought stress through the dew coupling and root hydraulic redistribution processes
Xue Fan1,2,3, Xingming Hao1,3, Sen Zhang1,2,3
1State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
Annals of Botany
|January 10, 2023
Summary
Plants in arid regions can absorb dew through leaves and redistribute it to the soil. This dew redistribution process, involving Populus euphratica, aids plant survival and ecosystem stability in dry environments.
Area of Science:
- Plant Physiology
- Ecology
- Hydrology
Background:
- Arid and semi-arid regions face water scarcity, impacting plant survival and community stability.
- Plants possess mechanisms for direct dew absorption via leaves and hydraulic redistribution through roots.
- Dew's potential role in plant hydraulic redistribution and soil moisture maintenance remains an area of investigation.
Purpose of the Study:
- To investigate the water use mechanism of Populus euphratica in arid environments.
- To determine if dew participates in the hydraulic redistribution process in plants.
- To understand how plants utilize dew for water management during dry periods.
Main Methods:
- Comprehensive observation of sap flow, water potential, and soil water content.
- Utilized a heavy water tracer experiment under in situ field conditions.
- Investigated the water uptake and redistribution patterns of Populus euphratica.
Main Results:
- Dew contributed significantly to soil moisture (28.3%) near Populus euphratica roots.
- Foliar dew application improved soil moisture status, demonstrating direct water uptake.
- Hydraulic redistribution occurred primarily at night (22:00–08:00) in the 20–80 cm soil layers.
- Trunk water storage acts as an intermediary for foliar water uptake and redistribution, replenished in May-July and consumed year-round.
Conclusions:
- Dew is effectively redistributed into the soil via a coupled process of foliar water uptake and root hydraulic redistribution.
- Populus euphratica employs trunk and soil water storage to mitigate short-term drought stress.
- Findings support vegetation restoration in water-deficient areas, enhancing ecosystem stability and soil water balance in arid zones.
More Related Videos
Related Concept Videos
02:41Responses to Drought and Flooding
10.8K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.8K
01:57Adaptations that Reduce Water Loss
25.9K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.9K
02:04Regulation of Transpiration by Stomata
28.7K
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
28.7K
02:03Xylem and Transpiration-driven Transport of Resources
24.2K
The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
24.2K
02:02Responses to Salt Stress
13.2K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.2K
00:53Tonicity in Plants
54.1K
Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.
54.1K