Thigmotropism is the tropic movement in the plants due to the stimulus of touch, tactile, mechanical or rubbing. The response is generally positive in stem of climbers and in tendrils causing them to twin round the support. The first response, which occurs within a few seconds after perceiving the stimulus, is the contraction of the cells towards the side of stimulus, with the results cells become concave. Simultaneously, the cells expand on the opposite side. The growth rate increases 40-200 folds on convex side, whereas on concave side the growth rate becomes slow or stops.
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