Exposure to light directly enhances the structural adhesion between the outermost epidermal layer and the inner tissues of plant stems. This physiological response acts as a mechanical regulatory system that limits internal tissue expansion and governs overall plant growth.
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https://www.sflorg.com/2026/04/bot04132601.html
A new mechanism for light-controlled plant growth

Compared with plants grown in the dark, the epidermal and inner tissues of plants grown in the light are more tightly bound together