RE: [IAWA Forum] Radial water transport

From: Lloyd.Donaldson@ForestResearch.co.nz
Subject: RE: [IAWA Forum] Radial water transport
Date: Tue, 8 Oct 2002 08:22:03 +1300
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I agree with other comments that pine rays do contain intercellular spaces
although they are very small. While Ray parenchyma cells in pine sapwood
are "alive" I would not describe them as being full of cytoplasm. Like many
plant cells they are mostly vacuole with the odd starch grain and a
nucleus. My point was that if the cell wall is unlignified then the highly
porous cellulose would act like blotting paper. Another possibility is
water movement via resin canals which form an interconnecting radial and
longitudinal network in some conifers. I have seen dye conduction
experiments where both rays and resin canals conduct dye.

On the question of ray cell lignification a reference for radiata pine is
Bamber, R.K., Davies, G.W. (1969). Lignification of ray parenchyma cell
walls in the wood of Pinus radiata D. Don. Holzforschung 23,83-84. However
I am sure this varies between species within the conifers. For those
interested in lignification there is a bibliography at:
http://www.forestresearch.co.nz/topic.asp?docid=234&contenttype=general&topic=Microscopy&title=Bibliography%20of%20Lignification%20and%20Lignin%20Topochemistry

Lloyd


                                                                                                                      
                    "Gartner,                                                                                         
                    Barbara"               To:     <Lloyd.Donaldson@forestresearch.co.nz>                             
                    <Barbara.Gartner       cc:                                                                        
                    @orst.edu>             Subject:     RE: [IAWA Forum] Radial water transport                       
                                                                                                                      
                    07/10/02 08:37                                                                                    
                    PM                                                                                                
                                                                                                                      
                                                                                                                      




I ask this naively, but how can water move through ray parenchyma, when
it's full or cytoplasm?  Do you think it has to be actively transported?

I'm taking off for a 1-week meeting in 4 hours (aargh) so I'm not sure when
I'll see your reply.

barb

-----Original Message-----
From: Lloyd.Donaldson@forestresearch.co.nz
[mailto:Lloyd.Donaldson@forestresearch.co.nz]
Sent: Sunday, October 06, 2002 12:50 PM
To: iawa@COF.ORST.EDU
Subject: RE: [IAWA Forum] Radial water transport



----- Forwarded by Lloyd Donaldson/ForestResearch/NZ on 07/10/02 08:49 AM
-----

Hi Barbara

It is quite common for adjacent tracheids to overlap on their radial walls
and to have double columns of bordered pits. This provides a zig-zag
pathway for radial water movement within a growth ring. I suspect rays are
involved in between ring movement. Depending on species most ray parenchyma
cells are unlignified so water movement should be quite easy - and of
course ray tracheids where they occur, may have a role. Alot of work has
been done on water movement in rays from the point of view of preservative
treatment of wood. However this is based on wood that has been dried and
drastic changes in ray anatomy take place on drying with collapse of cells
to form large intercellular spaces (again depending on species). See IAWA
J. below
Matsumura,   J.,   Booker,  R.E.,  Donaldson,  L.A.,  Ridoutt,  B.G.  1998:
    Impregnation  of  radiata pine wood by vacuum treatment: Identification
    of  flow  paths  using fluorescent dye and confocal microscopy. IAWA J.
    19: 25-33.

Hope that helps.

Best regards - Lloyd

Dr Lloyd Donaldson - Microscopist
Future Forests
Forest Research,
Private Bag 3020, Rotorua, New Zealand
Ph 64 7 343 5581
email lloyd.donaldson@forestresearch.co.nz
www.forestresearch.co.nz/mnz



                    "Gartner,

                    Barbara"               To:     <iawa@COF.ORST.EDU>

                    <Barbara.Gartner       cc:

                    @orst.edu>             Subject:     [IAWA Forum] Radial
water transport
                    Sent by:

                    owner-iawa@COF.O

                    RST.EDU



                    07/10/02 06:47

                    AM

                    Please respond

                    to "Gartner,

                    Barbara"







I've been working in the area of radial water transport lately, and I
wondered if anyone else has been thinking about this, and what your ideas
might be.  In conifers, it is rare to have pitting on the tangential face
of tracheids, except sometimes a bit in the latewood.  How do you think
water gets from one growth ring to the next, and from one layer of
tracheids to the subsequently developed layer within that same growth ring?
Is there any evidence that water is transported in rays, ray tracheids, or
radial interstitial spaces?

We know from sapflow experiments that there *is* water transport in inner
growth rings, and given that the foliage is attached to the outer growth
rings there *must* be radial water movement.  I wonder if all the movement
is through diffusion through cell walls.

Thanks for any ideas,
Barb

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Barbara L. Gartner                barbara.gartner@orst.edu
Dept. of Wood Sci. & Engineering  voice:  541-737-4213
Oregon State University           fax:    541-737-3385
Corvallis, OR 97331
http://woodscience.oregonstate.edu/faculty/gartner/gartner.htm


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