Grass stems build their strength on a daily temperature schedule
Gregory GA, Khahani B, Coomey JH, Gonze D, Omran S
Plant Signaling
The stiff, upright stems that keep your ornamental grasses and cereal crops from flopping over are being built on a strict daily temperature schedule, which means heat waves or cold snaps during the growing season could directly change how sturdy those plants turn out.
Researchers made grass stems glow so they could watch, in real time, exactly when and where the plant builds its tough internal scaffolding, called secondary cell walls, that lets it stand up straight. They found this construction work follows a strict daily rhythm set by temperature swings, not by sunlight or the plant's internal clock. A quick blast of heat or cold flips the process in opposite directions almost instantly, showing that grass stems are constantly reading the temperature to decide when to reinforce themselves and grow taller.
Key Findings
A luciferase reporter driven by the CESA8 gene region allowed real-time bioluminescence imaging of secondary cell wall gene activity in living Brachypodium distachyon stems
CESA8 expression follows a daily rhythm driven directly by temperature cycles, independent of light or the plant's internal circadian clock
Brief temperature pulses caused rapid, inverse (opposite-direction) changes in gene expression, matching predictions from a mathematical incoherent feedforward loop model, and expression correlated strongly with stem elongation
chevron_right Technical Summary
Scientists watching living grass stems glow in real time discovered that the plant's stem-stiffening process runs on a daily temperature clock, not light or an internal body clock, revealing how grasses decide when to build strong, upright stems.
Abstract Preview
Original paper
Temperature signals drive grass secondary cell wall thickening.
Secondary cell wall thickening is essential for plant structural development, providing the mechanical strength and rigidity required for upright growth. However, direct observation of this process...
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Brachypodium distachyon, commonly called purple false brome or stiff brome, is a grass species native to southern Europe, northern Africa and southwestern Asia east to India. It is related to the major cereal grain species wheat, barley, oats, maize, rice, rye, sorghum, and millet. It has many qu...