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Thigmotropism

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by

Luc Bonville

on 2 November 2012

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Transcript of Thigmotropism

thig·mot·ro·pism "The turning or bending of a plant or other organism in response to a touch stimulus" Thigmotropism -Thigmotropism is essentially the response to a physical stimulus by a plant

-Example: coiling tendrils This is when a plant responds to the stimuli by growing towards the object.
An example of this is the sweet pea plant.
The reason for Positive Thigmotropism is to provide the plant with strength and structure to allow it to grow taller and ultimately be closer to the sun. This is when the plant senses an object (stimuli) it grows away from the object, rather than towards it.
An example of this is a plant's roots growing away from an object
They will do this because they want to grow in the path with the least amount of resistance. (The path with the least amount of required energy) What is Thigmotropism? Positive Thigmotropism Negative Thigmotropism Like phototropism, plants use hormones to allow them to react to a stimuli in either a positive or negative way.
It occurs by a process called differential growth, meaning one 'side' of the plant grows longer than the other. A Plant cells may also contract on one side to encourage this process.
If the plant intends to grow towards or away from an object it will send a signal to the opposing side and cause the plant to curl either towards or away from it. How does thigmotropism occur?
-how can the plant bend? The Touch Me-Not Plant The touch me not plant is a unique example of thigmotropism. It instantly responds to touch by folding in its leaves. Thigmotropism versus
Gravitropism Though the growth of plants can be influenced by gravitropism, thigmotropism ultimately overpower this stimuli. roots of a plant will go against gravitropism by no longer growing horizontally in order to avoid some form of barrier Rapid Contact Coiling Rapid contact coiling is an immediate response to touch. Unlike differential growth, it is instant and lasts for a shorter period of time.
Hairs or sensors on the epidermis of the plant will sense an object or barrier and by temporarily deforming the membrane the initial bending occurs. The End
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