How material move through PLANT CELL WALL!?!

Lodgic · 26 Aug 2007, 7:51 PM

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Ok, ive heard about movement of material, e.g. nutrients, to cross a cell MEMBRANE (plasma membrane) - this based on the fluid mosaci model, but plants have a CELL WALL!!! how does the cell wall allow movement of materials!?! -> and is the cell wall made of of layers???

Also, does the fluid-mosaic model apply to ALL cells?!? - or does it differ across the animal kingdoms, etc...

i have been asking myself these questions for bout a year now...without an answer, so an answer would be appreciated

BlackJack · 28 Aug 2007, 10:34 PM

Hmmm... Biology is more complicated than you can imagine.

In plants, you have large protein structures called plasmodesmata which sits across the cell wall connecting the membranes of adjacent plant cells. (I did a project on this in first year bio.)
To show this, if you start drying a plant cell ---
- you will see its volume decrease, and most of the cell membrane begin to shrink from the wall.
- BUT, there are numerous places where membrane is anchored. One sheet in the clothes line with a couple of pegs idea. You've found a plasmodesmatum.

These are most found on the phlem(sp?) which as you know transports nutrients up and down trees, branches and whatnot. They also regulate some of the transport, I think.
---
A cell wall is indeed kind of made of layers. It's more than just cellulose, and the kind of structures you see will depend on the part of the plant. Often there's an large mesh of 'fibres' with cellulose and proteins and... I forget, it's been a couple of ears.
---
What is the fluid-mosaic model? I didn't do highschool bio.

Lodgic · 28 Aug 2007, 10:48 PM

o, the fluid mosaic model is a model that represents a cell membrane...ie. with the phopholipids, etc...and how a cell membrane has a hydrophobic (water-hating) and hydrophilic (water-loving) layer

i cant remember all details as i did it a yr ago in yr 11 biology...but it also corresponds to carrier proteins carrying materials across a cell membrane (active transport)

BlackJack · 28 Aug 2007, 11:04 PM

Ah okay. I actually work with membranes.

Yeah, so there are actually holes in the cell wall where the plasmodesmata are supposed to sit.

**Survivor39** · 2 Sep 2007, 10:14 PM

Hey BlackJack, well-explained. Where are you currently doing your PhD?

26 Aug 2007, 7:51 PM	#1 (permalink)
Lodgic Senior Member HSC: 2007 Gender: Male Join Date: Aug 2007 Posts: 249 Last Activity: 9 Aug 2009, 2:16 AM	How material move through PLANT CELL WALL!?! You can hide this advertisement by registering. Ok, ive heard about movement of material, e.g. nutrients, to cross a cell MEMBRANE (plasma membrane) - this based on the fluid mosaci model, but plants have a CELL WALL!!! how does the cell wall allow movement of materials!?! -> and is the cell wall made of of layers??? Also, does the fluid-mosaic model apply to ALL cells?!? - or does it differ across the animal kingdoms, etc... i have been asking myself these questions for bout a year now...without an answer, so an answer would be appreciated

28 Aug 2007, 10:34 PM	#2 (permalink)
BlackJack Vertigo! HSC: 2002 Gender: Male Location: 15 m above the pavement Join Date: Sep 2002 Posts: 1,239 Last Activity: 4 Nov 2007, 5:20 PM	Re: How material move through PLANT CELL WALL!?! Hmmm... Biology is more complicated than you can imagine. In plants, you have large protein structures called plasmodesmata which sits across the cell wall connecting the membranes of adjacent plant cells. (I did a project on this in first year bio.) To show this, if you start drying a plant cell --- - you will see its volume decrease, and most of the cell membrane begin to shrink from the wall. - BUT, there are numerous places where membrane is anchored. One sheet in the clothes line with a couple of pegs idea. You've found a plasmodesmatum. These are most found on the phlem(sp?) which as you know transports nutrients up and down trees, branches and whatnot. They also regulate some of the transport, I think. --- A cell wall is indeed kind of made of layers. It's more than just cellulose, and the kind of structures you see will depend on the part of the plant. Often there's an large mesh of 'fibres' with cellulose and proteins and... I forget, it's been a couple of ears. --- What is the fluid-mosaic model? I didn't do highschool bio. __________________ Currently in Ph.D. Biophysics. === "Profound and prophetic? Nay, confounded and pathetic!" '02 boy http://zharmad.livejournal.com/ === So what if I have two left hands?! (see userpic)

28 Aug 2007, 10:48 PM	#3 (permalink)
Lodgic Senior Member HSC: 2007 Gender: Male Join Date: Aug 2007 Posts: 249 Last Activity: 9 Aug 2009, 2:16 AM	Re: How material move through PLANT CELL WALL!?! o, the fluid mosaic model is a model that represents a cell membrane...ie. with the phopholipids, etc...and how a cell membrane has a hydrophobic (water-hating) and hydrophilic (water-loving) layer i cant remember all details as i did it a yr ago in yr 11 biology...but it also corresponds to carrier proteins carrying materials across a cell membrane (active transport)

28 Aug 2007, 11:04 PM	#4 (permalink)
BlackJack Vertigo! HSC: 2002 Gender: Male Location: 15 m above the pavement Join Date: Sep 2002 Posts: 1,239 Last Activity: 4 Nov 2007, 5:20 PM	Re: How material move through PLANT CELL WALL!?! Ah okay. I actually work with membranes. Yeah, so there are actually holes in the cell wall where the plasmodesmata are supposed to sit. __________________ Currently in Ph.D. Biophysics. === "Profound and prophetic? Nay, confounded and pathetic!" '02 boy http://zharmad.livejournal.com/ === So what if I have two left hands?! (see userpic)

2 Sep 2007, 10:14 PM	#5 (permalink)
Survivor39 Moderator HSC: 2003 Gender: Undisclosed Join Date: May 2003 Posts: 4,205 Last Activity: Today, 12:37 PM	Re: How material move through PLANT CELL WALL!?! Hey BlackJack, well-explained. Where are you currently doing your PhD? __________________ PhD, University of Cambridge, 09-12 MSc, UNSW, 08-09 BMedSc (Hons I), UNSW, 04-07

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