Re: Radial water transport

From: MelTyree@aol.com
Subject: Re: Radial water transport
Date: Mon, 7 Oct 2002 11:38:38 EDT

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But I don't think intercellular spaces could contribute much to radial 
transport of liquid water in trees. The intercellular spaces would have to be 
very well isolated from outside air otherwise they would embolize very 
easily. My guess (and this is only a guess) is that intercellular spaces 
would be water filled only from xylem pressure potentials of 0.0 to -0.15MPa. 

The accepted interpretation (without lots of proof) is that intercellular 
spaces are a location of stored water and such stored water is mostly gone by 
-0.2 MPa. But while the spaces are filled with water they could contribute to 
radial transport. See Xylem Structure and the Ascent of Sap (Second edition) 
by Tyree & Zimmermann, which is now in print from Springer!
If you have any photos of intercellular spaces I would be very interested in 
having copies. I think we need more research on this topic.
The story about ray cells NOT being lignified is interesting to me. Does 
anyone have any citations for that?
Thanks,
Mel

Melvin T. Tyree
Project Leader NE4103
USDA Forest Service
Aiken Forestry Sciences Lab
705 Spear St  PO Box 968
Burlington VT 05402
Phone 802 951 6771 x 1310
FAX 802 951 6368

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<HTML><FONT FACE=arial,helvetica><FONT  SIZE=3 FAMILY="SERIF" FACE="Times New Roman" LANG="0">But I don't think intercellular spaces could contribute much to radial transport of liquid water in trees. The intercellular spaces would have to be very well isolated from outside air otherwise they would embolize very easily. My guess (and this is only a guess) is that intercellular spaces would be water filled only from xylem pressure potentials of 0.0 to -0.15MPa. <BR>
The accepted interpretation (without lots of proof) is that intercellular spaces are a location of stored water and such stored water is mostly gone by -0.2 MPa. But while the spaces are filled with water they could contribute to radial transport. See Xylem Structure and the Ascent of Sap (Second edition) by Tyree &amp; Zimmermann, which is now in print from Springer!<BR>
If you have any photos of intercellular spaces I would be very interested in having copies. I think we need more research on this topic.<BR>
The story about ray cells NOT being lignified is interesting to me. Does anyone have any citations for that?<BR>
Thanks,<BR>
Mel<BR>
<BR>
</FONT><FONT  COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Melvin T. Tyree<BR>
Project Leader NE4103<BR>
USDA Forest Service<BR>
Aiken Forestry Sciences Lab<BR>
705 Spear St&nbsp; PO Box 968<BR>
Burlington VT 05402<BR>
Phone 802 951 6771 x 1310<BR>
FAX 802 951 6368<BR>
</FONT></HTML>
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