Dictionary » T » Tonoplast

Tonoplast

Definition

noun, plural: tonoplasts

The cytoplasmic membrane surrounding the vacuole, separating the vacuolar contents from the cytoplasm in a cell.


Supplement

As a membrane, it is mainly involved in regulating the movements of ions around the cell, and isolating materials that might be harmful or a threat to the cell.


Word origin: Gk tón(os) + -o-, meaning “stretching,” “tension,” “tone” + comb. form repr. Gk plastós formed, molded.

"Also called: vacuolar membrane.
See also: vacuole.


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Re: Plant vacuole

... say. What you explained simply meant that the vacuole has more water/volume than the cytoplasm. Thanks for that. From this I may suspect that the tonoplast is not just any lipid bilayer and that it is is more adept at handling tonicity than the plasma membrane. Exactly. it's membrane contains ...

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by Maatomaat
Thu Nov 24, 2011 11:04 am
 
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 6812

Re: Plant vacuole

... say. What you explained simply meant that the vacuole has more water/volume than the cytoplasm. Thanks for that. From this I may suspect that the tonoplast is not just any lipid bilayer and that it is is more adept at handling tonicity than the plasma membrane.

See entire post
by Adz795
Thu Nov 24, 2011 10:46 am
 
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 6812

Re:

... a/c>b/d ; So we say water consistency of vacuole is higher than cytoplasm. As a result we can say the Vacuole is hypotonic to the cell. but tonoplast usually doesn't allow to the water to enter to the cytoplasm. (vacuole's tonoplast has an attribute named "selective permeability" ...

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by Maatomaat
Thu Nov 24, 2011 10:40 am
 
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 6812

Re:

... be isotonic when there is a big difference between vacuole's and cytoplasm's consistency?! In my point of view it's hypotonic to the cytoplasm but tonoplast that is around of the vacuole ,doesn't allow to the water to enter to the cytoplasm.

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by Maatomaat
Wed Nov 23, 2011 11:00 am
 
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 6812

Plant vacuole

Isn't the plant vacuole hypotonic to the cytoplasm since it stores water during cell elongation? Does osmosis occur? Does the tonoplast have a role in tonicity issues? Thank you!

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by Adz795
Tue May 24, 2011 5:37 pm
 
Forum: Cell Biology
Topic: Plant vacuole
Replies: 8
Views: 6812
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