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Thigmomorphogenesis (Thigma --> to touch in Greek) is the response by plants to mechanical sensation (touch) by altering their growth patterns. In the wild, these patterns can be evinced by wind, raindrops, and rubbing by passing animals.
Botanists have long known that plants grown in a greenhouse tend to be taller and more spindly than plants grown outside. M.J. Jaffe discovered in the 1970s that regular rubbing or bending of stems inhibits their elongation and stimulates their radial expansion, resulting in shorter, stockier plants.
- Jaffe, MJ (1973). "Thigmomorphogenesis: The response of plant growth and development to mechanical stimulation". Planta 114 (2): 143–157. Retrieved March 15, 2015.
- Braam J, Davis RW (1990). "Rain-, wind-, and touch-induced expression of calmodulin and calmodulin-related genes in Arabidopsis". Cell 60 (3): 357–364. Retrieved March 15, 2015.