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Root pressure

Definition

noun

The osmotic pressure exerted in the roots of plants causing sap to rise through the stem to the leaves, and at night time causing guttation from the tips or edges of leaves


Supplement

Root pressure explains guttation in some plants. Also, it is one of the possible factors that explains transpiration stream in plants where water rises against gravity to move to areas that have less water. It also causes the exudation of water from the cut stem when the shoot is removed near the soil level.


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Diffusion

... by diffusion. A gas always diffuses from an area of high partial pressure to an area of lower partial pressure. Am I on the right track or ... potential drive the osmotic movement of water from cell to cell within root and leaf tissue. Does that all sound correct? If you have anything to ...

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by killian07
Mon Dec 12, 2011 4:23 am
 
Forum: General Discussion
Topic: Diffusion
Replies: 2
Views: 3465

Transpiration Please help Me

... sugar into the phloem, while at sugar sumps, e.g. non-photosyhthesing roots, the plants actively pump sugar out of the phloem. Consequently in ... into the xylem. This produces regions of high and low hydrostatic pressure in the xylem and phloem and a circular flow of liquid is established. ...

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by Dougalbod
Thu Oct 08, 2009 11:20 am
 
Forum: Botany Discussion
Topic: Transpiration Please help Me
Replies: 29
Views: 27766

water transport in plants.

transpiration does not equate root pressure

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by mith
Wed Sep 24, 2008 3:21 am
 
Forum: Botany Discussion
Topic: water transport in plants.
Replies: 3
Views: 5304

water transport in plants.

... water in the xylem 2. Gymnosperms can sometimes develop especially high root pressure, which may account for the rise of water int all pine trees wtihout transpirational ...

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by NewtoBiology
Sat Sep 13, 2008 1:12 am
 
Forum: Botany Discussion
Topic: water transport in plants.
Replies: 3
Views: 5304

Can plants absorb sucrose?

... potential is composed both of solute potential(osmotic potential) and pressure potential, which in root cells is negative because of the suction force that originates due to evaporation in leaves. ...

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by MrMistery
Wed Jul 02, 2008 7:49 am
 
Forum: Botany Discussion
Topic: Can plants absorb sucrose?
Replies: 12
Views: 40572
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