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Membrane Fluidity

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.

Responses to Heat and Cold Stress

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.

The Fluid Mosaic Model

The Fluid Mosaic Model

The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.

Fluid Mosaic Model

Fluid Mosaic Model

Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...

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.

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Related Experiment Video

Updated: Oct 15, 2025

Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus

Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus

Published on: January 30, 2020

Plasma Membrane Fluidity: An Environment Thermal Detector in Plants.

Dora L Cano-Ramirez¹, Laura Carmona-Salazar¹, Francisco Morales-Cedillo¹

¹Departamento de Bioquímica, Conjunto E, Facultad de Química, Universidad Nacional Autónoma de México, UNAM, Cd. Universitaria, Coyoacán, Ciudad de México 04510, Mexico.

|October 23, 2021

Summary

Plant cell membranes, particularly the plasma membrane (PM), detect temperature changes. PM fluidity rapidly adjusts to thermal variations, acting as a crucial temperature sensor for plants.

Keywords:

lipids membrane fluidity membrane lipids plant membranes plasma membrane temperature perception

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Last Updated: Oct 15, 2025

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Published on: January 30, 2020

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Area of Science:

Plant biology
Membrane biophysics
Environmental sensing

Background:

Cell membranes regulate fluidity in response to temperature.
Plants require precise thermal sensing for survival.
Mechanisms of plant temperature perception are largely unknown.

Purpose of the Study:

Investigate the thermal plasticity of membrane fluidity in plants.
Determine the role of different membrane fractions in temperature sensing.
Identify the key membrane component responsible for thermal detection.

Main Methods:

Utilized three fluorescent probes to measure membrane fluidity.
Analyzed fluidity across a temperature range of -5 to 41 °C.
Examined isolated microsomal fraction (MF), vacuolar membrane (VM), and plasma membrane (PM) vesicles from Arabidopsis.

Main Results:

Plasma membranes (PM) exhibited higher fluidity and more phase transitions than VM and MF.
PM displayed significant hysteresis, indicating rapid fluidity adjustments.
MF and VM lacked the dynamic fluidity changes observed in PM.

Conclusions:

Plant plasma membranes (PM) are critical for rapid temperature detection.
PM fluidity is highly sensitive to small temperature fluctuations.
PM functions as an optimal, energy-efficient thermal sensor in plants.