Researchers have identified the biological mechanism trees use to maintain upright posture through proprioception, an internal sense of body position previously thought to exist only in animals. While scientists established in 2012 that plants could detect their own shape, the specific processes converting that awareness into physical movement remained unclear until recently.
To isolate how trees respond to their internal sense of shape independent of external environmental cues, researchers developed an experimental system using a rotating horizontal platform placed inside a sphere with uniform lighting. This setup eliminated consistent directional signals from gravity and light. Young poplar trees were positioned horizontally on the platform, and as they grew, their stems gradually curved upward naturally. After approximately ten days, the curved trees were placed into the experimental apparatus.
Over subsequent weeks, the stems slowly straightened despite the absence of typical environmental directional signals. Analysis of the wood structure revealed that the original tension wood, a specialized type capable of generating pulling forces, stopped developing on the upper side of the stems once the experimental system was activated. Simultaneously, tension wood began forming on the opposite side, creating forces in the opposing direction. This coordinated development of tension wood on alternating sides functioned like opposing muscle groups, gradually straightening the curved stems.
Previous understanding held that tension wood formed only on the upper side of stems to help pull them upward, particularly visible in trees on mountain slopes. The new research demonstrates that tension wood has broader capabilities, developing on different sides of stems to generate forces in varying directions, allowing trees to coordinate their growth and adjust posture accordingly.
These findings have implications for forestry, agriculture, and climate resilience. Understanding proprioception in plants could enable selection of tree varieties that grow straighter and produce higher-quality wood. In agriculture, similar knowledge might help develop cereal crops less prone to lodging, a condition where crops collapse before harvest. As climate change exposes forests to more extreme conditions, the capacity to regain appropriate posture becomes increasingly valuable for tree resilience.
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