Trees' 'Muscles' Uncovered: Mechanism for Self-Righting Fallen Trunks Revealed

A research team from the French National Institute for Agricultural, Food, and Environmental Research (INRAE) has uncovered the mechanism by which fallen or leaning trees can right themselves. This ability is realized through structures within the tree trunk that function like 'muscles,' similar to the proprioception possessed by animals. While a 2012 study had suggested that plants possess the ability to recognize their own body position, the biological mechanism behind it remained unknown. The current research has revealed that these 'muscles' play a role in pulling the tree trunk back to an upright position. It has been difficult to isolate and study individual plant senses because they respond to multiple stimuli, including gravity, light, and their own shape. The research team succeeded in identifying the self-correcting movements driven by the plant's internal shape recognition by conducting an experiment where young poplar trees were placed on a continuously rotating platform, eliminating the direction of gravity and ensuring uniform illumination. With the direction of gravity eliminated and light coming evenly from all sides, any remaining self-correction movement could be directly attributed to the tree's internal sense of its own shape. This discovery suggests that plants not only passively adapt to their environment but also actively maintain their posture, deepening our understanding of plant ecology and growth mechanisms. This research may offer new perspectives for understanding tree survival strategies and their impact on ecosystems, particularly in regions with extensive rainforests like Indonesia.