Related Experiment Video
Updated: Jul 8, 2026
07:08
Identification of Novel Regulators of Plant Transpiration by Large-Scale Thermal Imaging Screening in Helianthus Annuus
Published on: January 30, 2020
Temperature signals drive grass secondary cell wall thickening
Greg A Gregory1, Bahman Khahani1, Joshua H Coomey1
1Biology Department, University of Massachusetts, Amherst, 611 N. Pleasant St., Amherst, MA 01003, USA; Plant Biology Graduate Program, University of Massachusetts, Amherst, 611 N. Pleasant St., Amherst, MA 01003, USA.
Current Biology : CB
|July 6, 2026
Summary
Scientists visualized secondary cell wall formation in real-time using bioluminescence imaging in Brachypodium distachyon. This revealed temperature-driven daily rhythms in CELLULOSE SYNTHASE A (CESA) gene expression, crucial for plant structural development.
Area of Science:
- Plant Biology
- Molecular Biology
- Biophysics
Background:
- Secondary cell walls provide essential structural support and rigidity for plant growth.
- Understanding the precise regulation of cellulose synthesis, a key component of secondary walls, is crucial for plant development.
- Direct observation of secondary cell wall biosynthesis in living plants has been challenging.
Purpose of the Study:
- To develop a real-time imaging system to observe secondary cell wall thickening in vivo.
- To investigate the spatiotemporal regulation of CELLULOSE SYNTHASE A (CESA) gene expression during plant development.
- To elucidate the environmental factors influencing cellulose deposition and plant structural integrity.
Main Methods:
- Developed a bioluminescence imaging system using a luciferase reporter driven by the CESA8 promoter in Brachypodium distachyon.
- Utilized time-lapse imaging to monitor CESA8 expression patterns in elongating internodes.
- Performed temperature-pulse experiments and mathematical modeling to analyze gene expression dynamics.
Main Results:
- CESA8 expression showed a distinct spatial pattern in elongating internodes, correlating with secondary wall deposition and cellulose crystallinity.
- CESA8 expression exhibited a strong daily rhythm regulated by temperature cycles, independent of light or circadian signals.
- Mathematical modeling accurately predicted rapid, transient inverse responses in CESA8 expression to temperature changes.
Conclusions:
- The study provides the first real-time visualization of secondary cell wall biosynthesis in grasses.
- Temperature cycles are a primary driver of daily CESA8 expression rhythms, linking structural reinforcement to temperature-dependent growth.
- The findings reveal a novel mechanism for coordinating plant structural development with environmental cues.
Related Concept Videos
02:43Plant Cell Wall
The plant cell wall gives plant cells shape, support, and protection. As a cell matures, its cell wall specializes according to the cell type. For example, the parenchyma cells of leaves possess only a thin, primary cell wall.Collenchyma and sclerenchyma cells, on the other hand, mainly occur in the outer layers of a plant's stems and leaves. These cells provide the plant with strength and support by either partially thickening their primary cell wall (i.e., collenchyma), or depositing a...
01:07Plant Cell Wall
Plant cells have a cell wall, a rigid outer covering that protects the cell and provides shape and support. During cell division, a mixture of enzymes, proteins, and glucose molecules is transported via vesicles to the center of the cell. These vesicles continuously fuse and build a cell plate between the dividing cells. As the cell plate matures, new polysaccharides are added to it to form the cell walls of the daughter cells. The predominant polysaccharide in the cell wall is cellulose, made...
02:45Responses 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.
00:53Tonicity 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.Plants and Hypotonic EnvironmentsUnlike animal cells,...
01:20Tonicity 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
Tonicity describes the capacity of a cell to lose or gain water depending on the solute...
01:15Cellulose and Pectic Polysaccharides
Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...