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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...

Role of Microtubules in Cell Wall Deposition

Role of Microtubules in Cell Wall Deposition

Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...

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.

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.

Morphogenesis

Morphogenesis

Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.

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Related Experiment Video

Updated: Jan 10, 2026

AFM-based Mapping of the Elastic Properties of Cell Walls: at Tissue, Cellular, and Subcellular Resolutions

AFM-based Mapping of the Elastic Properties of Cell Walls: at Tissue, Cellular, and Subcellular Resolutions

Published on: July 24, 2014

Ethylene modulates cell wall mechanics for root responses to compaction.

Jiao Zhang¹, Zengyu Liu¹, Edward J Farrar²

¹Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China.

|November 26, 2025

Summary

Ethylene signaling in plants controls root cell wall biosynthesis to promote radial expansion under soil compaction. This research reveals how ethylene regulates cellulose synthesis, impacting root growth in challenging agricultural conditions.

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Characterizing Mechanical Properties of Primary Cell Wall in Living Plant Organs Using Atomic Force Microscopy

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Area of Science:

Plant biology
Agricultural science
Molecular genetics

Background:

Soil stresses, such as compaction, significantly impact crop yields and pose global agricultural challenges.
Soil compaction inhibits root growth, specifically reducing root length and radial expansion, a process influenced by the plant hormone ethylene.

Purpose of the Study:

To elucidate the mechanism by which ethylene controls cell wall biosynthesis to promote root radial expansion.
To understand how soil compaction stress, mediated by ethylene, affects root development at a molecular level.

Main Methods:

Investigated the role of ethylene signaling in response to soil compaction stress.
Analyzed the regulation of Auxin Response Factor1 (ARF1) and cellulose synthase (CESA) genes in the root cortex.
Examined changes in cell wall biosynthesis and root cell morphology.

Main Results:

Soil compaction stress upregulates ethylene signaling, which in turn increases Auxin Response Factor1 (ARF1) expression in the root cortex.
ARF1 represses the expression of cellulose synthase (CESA) genes, leading to altered cell wall biosynthesis.
Repression of CESA genes drives radial expansion of root cortical cells by modifying cell wall thickness, resulting in a thicker epidermis and thinner cortex.

Conclusions:

Ethylene signaling is a key regulator of root cell wall remodeling in response to soil compaction.
Dynamic regulation of cellulose synthesis by ethylene and ARF1 is crucial for root growth adaptation in compacted soils.
This study provides a molecular link between ethylene, cell wall biosynthesis, and root developmental plasticity under stress.