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Gravitropism

Gravitropism

Directional growth of a plant organ in response to a gravitational field roots grow downwards, shoots grow upwards. Achieved by differential growth on the sides of the root or shoot. A gravitation field is thought to be sensed by sedimentation of statoliths (starch grains) in root caps.


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How does the seed know which direction to sprout?

... takes over: the stem grows towards the light and the root away from light. However, something that cannot be explained by the current model of gravitropism(which is not well established, lots of things about it need to be tested) is this situation: the stem grows DIRECTLY down(without being ...

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by MrMistery
Mon Sep 10, 2007 5:35 pm
 
Forum: Botany Discussion
Topic: How does the seed know which direction to sprout?
Replies: 5
Views: 6449

How does the seed know which direction to sprout?

... However, when a plant is in the ground, there is no light to sense in either direction. the signal that acts here is gravity. stems have negative gravitropism, meaning that they generally grow opposing gravity. how this is done is by the lateral movement of auxin through the stem of the cell. ...

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by MrMistery
Mon Sep 10, 2007 9:08 am
 
Forum: Botany Discussion
Topic: How does the seed know which direction to sprout?
Replies: 5
Views: 6449

Negative gravitropism

... happens? http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html Edit - this is also evident in the Arabidopsis negative gravitropism video.

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by 45561
Sun Jun 03, 2007 7:32 pm
 
Forum: Botany Discussion
Topic: Negative gravitropism
Replies: 1
Views: 4640

polar transport of auxin

... the cell below it by carrier proteins. This leads to an asymmetrical distribution of auxin, and leads to other phenomena with plant growth, like gravitropism. I hope this helps. If you would like to know where I found this information, just let me know.

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by Volvox
Mon Jan 29, 2007 4:44 am
 
Forum: Botany Discussion
Topic: polar transport of auxin
Replies: 9
Views: 7298

Bryophytes

"It would be a useless thing since briophites do not fototropism and gravitropism" Most of parasite plant have this characteristic.(I don't mean all sp in Bryophytes is parasite) . but "low degree revolution plant" is not shows anything about auxin, some bacteria ...

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by mothorc
Wed Jun 22, 2005 2:00 pm
 
Forum: Botany Discussion
Topic: Bryophytes
Replies: 16
Views: 13853
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