Tension wood is a specialized biological tissue in hardwood trees that acts like a muscle to pull leaning branches and trunks back into an upright position.
How Tension Wood Works
▫️Location: It grows strictly on the upper side of leaning hardwood branches or trunks (unlike softwoods or evergreens, which use "compression wood" on the underside to push themselves up).
▫️The "Gelatinous" Layer (G-Layer): Specialized wood fibers in tension wood contain a unique, extra layer rich in pure, tightly packed cellulose microfibrils.
▫️The Pulling Force: As these new wood cells mature, they contract lengthwise. This high tensile stress acts like a cable or a contracting muscle, actively yanking the heavy limb or stem upward.
▫️Self-Correction and Proprioception: Recent research published in New Phytologist by scientists from INRAE and the University Clermont Auvergne shows that trees can trigger and guide tension wood using proprioception—an internal sense of their own shape and curvature, allowing them to straighten out within weeks even without light or gravity cues.
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