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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...

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 Animals

Tonicity in Animals

Tonicity describes the amount of solute in a solution. The measure of the tonicity of a solution, or the total amount of solutes dissolved in a specific amount of solution, is called its osmolarity. Three terms—hypotonic, isotonic, and hypertonic—are used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells. In a hypotonic solution, such as tap water, the extracellular fluid has a lower concentration of solutes than the fluid inside...

Tonicity in Animals

Tonicity in Animals

The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...

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.

Factors Influencing Microbial Growth: Osmolarity

Factors Influencing Microbial Growth: Osmolarity

Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...

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Related Experiment Video

Updated: Mar 17, 2026

Measuring the Osmotic Water Permeability Coefficient Pf of Spherical Cells: Isolated Plant Protoplasts as an Example

Measuring the Osmotic Water Permeability Coefficient Pf of Spherical Cells: Isolated Plant Protoplasts as an Example

Published on: October 8, 2014

Osmolyte cooperation affects turgor dynamics in plants.

Alfredo Argiolas^1,2, Gian Luigi Puleo¹, Edoardo Sinibaldi¹

¹Center for Micro-BioRobotics, Istituto Italiano di Tecnologia, Viale Rinaldo Piaggio 34, 56025 Pontedera, Italy.

Scientific Reports

|July 23, 2016

Summary

Plant cell turgor drives movement via osmolytes. This study reveals that combinations of osmolytes, like L-glutamine and D-glucose, create higher turgor than single compounds, crucial for plant actuation.

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Published on: July 24, 2014

Area of Science:

Plant Biology
Biophysics
Biochemistry

Background:

Plant movements rely on turgor pressure, generated by water movement across cell membranes.
Previous research focused on potassium chloride (KCl), but other osmolytes like L-glutamine (L-Gln) and D-glucose (D-Glc) also contribute to turgor.
The synergistic effects of these osmolytes on turgor dynamics are not fully understood.

Purpose of the Study:

To investigate the cooperative effects of multiple osmolytes on turgor generation in a model plant cell system.
To determine if osmolyte combinations can achieve higher turgor pressures than individual osmolytes.
To explore the potential for developing novel osmotic actuators based on osmolyte dynamics.

Main Methods:

Osmometry and Nuclear Magnetic Resonance (NMR) spectroscopy were used to measure turgor profiles and osmolyte interactions.
A previously developed plant cell-inspired device was utilized to test osmolyte complex performance.
Experiments were conducted using experimentally relevant and modified concentrations of KCl, D-Glc, and L-Gln.

Main Results:

The study demonstrates that specific associations and cooperative effects among osmolytes (KCl, D-Glc, L-Gln) influence time-dependent turgor profiles.
Osmolyte complexes, not single osmolytes, were found to generate the higher turgor pressures necessary for plant movements.
Quantitative data were obtained regarding osmolyte influence and association.

Conclusions:

Osmolyte complexes are more effective than individual osmolytes in generating significant turgor for plant actuation.
Findings provide insights into osmolyte transport mechanisms relevant to plant movement.
The research opens possibilities for creating advanced osmotic actuators utilizing dynamic osmolyte concentrations.