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A flytrap as a kind of insectivorous plant has receptors to mechanical stimuli called sensory hairs, its leaves for capturing bugs are momentarily closed in contact of those sensory hairs with an insect.
C.Darwin described that this mysterious plant is one of the wonderful beings in the world.
Cases whose shape is momentarily varied in response to contact such as flytrap are rare in the nature.
But, the same as animals plants also sense mechanical stimuli, they have mechanisms to respond to stimuli at individual level through cells.
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Though gravity is far different from contact in character, it also is one of the important mechanical stimuli for plants.
Gravity as a vector brings mechanical stimulative informations such as direction and power to plants.
Plants laid down by winds in a previous evening are at upright poses in the next day.
And, roots grow under the ground deeperly.
Because, plants sense gravity as a mechanical stimulus, they vary its growth direction on the stimulus.
By the way, how plants sense gravity.
To solve this mystery in botany for about 200 years, arabidopsis has been observed as a subject from various viewpoints.
We deal with two gravity-sensing models for plants as hypotheses in this chapter.
And, we introduce stretch-activation channels and responsive signaling to gravity of plants here to consider about gravity-sensors for plants which have been still un-known.
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