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Responses to Salt Stress

Responses to Salt Stress

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.

Responses to Drought and Flooding

Responses to Drought and Flooding

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.

Tonicity in Plants

Tonicity in Plants

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.

Tonicity in Plants

Tonicity in Plants

Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
Tonicity
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...

Adaptations that Reduce Water Loss

Adaptations that Reduce Water Loss

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.

Water and Mineral Acquisition

Water and Mineral Acquisition

Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.

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Related Experiment Video

Updated: Dec 20, 2025

Production of Arbuscular Mycorrhizal (AM) Fungal Inoculum and Phenotypic Evaluation of Rice and AM Symbiosis Under Saline Conditions

Production of Arbuscular Mycorrhizal (AM) Fungal Inoculum and Phenotypic Evaluation of Rice and AM Symbiosis Under Saline Conditions

Published on: March 14, 2025

Root hydraulics in salt-stressed wheat.

Wieland Fricke¹, Ehsan Bijanzadeh², Yahya Emam³

¹School of Biology and Environmental Science, Science Centre West, University College Dublin, Belfield, Dublin 4, Ireland.

Functional Plant Biology : FPB

|June 3, 2020

Summary

Salinity significantly reduces root water transport in bread wheat by 40-80%. Salt stress impacts water uptake pathways, primarily affecting membrane transport in developing wheat plants.

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Area of Science:

Plant Physiology
Environmental Stress Biology

Background:

Salinity poses an osmotic stress challenge to plants, potentially hindering water uptake.
Understanding salinity's impact on root hydraulic conductivity is crucial for crop resilience.

Purpose of the Study:

To investigate the effect of salinity on root water transport properties (hydraulic conductivity) in bread wheat (Triticum aestivum L).
To determine if salt stress alters water uptake pathways in wheat roots.

Main Methods:

Hydroponically grown wheat plants were exposed to 100mM NaCl.
Root hydraulic conductivity (Lp) was measured using osmotic and hydrostatic methods on individual roots, whole root systems, and intact plants.
Analyses were conducted at different developmental stages, including the presence of seminal and adventitious roots.

Main Results:

Salt stress induced a substantial reduction (40-80%) in root hydraulic conductivity (Lp).
Both osmotic and hydrostatic Lp measurements showed similar reductions under salt stress.
Water uptake in control plants increasingly utilized the apoplast pathway with development, an effect diminished in NaCl-stressed plants.

Conclusions:

Salinity significantly impairs root water transport in bread wheat.
The primary pathway for radial water uptake in wheat roots involves crossing membranes, a process sensitive to salt stress.
Developmental changes in water uptake pathways are altered by salinity, with reduced apoplastic contribution in stressed plants.