Re: [IAWA Forum] questions?

From: "Veronica Angyalossy Alfonso" <valfonso@ib.usp.br>
Subject: Re: [IAWA Forum] questions?
Date: Sun, 13 Oct 2002 17:45:33 -0300
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Hi,

About unlignified parenchyma:

Carlquist, 1991, doesn't bring information about this topic.

He mentions "thin walled parenchyma" at stems of suculents, as Carica,
certain cacti and many Crassulaceae at his book: (page 343) -  Carlquist, S.
1988. Comparative wood anatomy. Springer Verlag. New York.

Veronica Angyalossy Alfonso
Departamento de Botânica
Instituto de Biociências
Universidade de São Paulo


----- Original Message -----
From: <xylem@unity.ncsu.edu>
To: Guillermo Angeles Alvarez <alvarezg@ecologia.edu.mx>
Cc: <MelTyree@aol.com>; <iawa@COF.ORST.EDU>
Sent: Monday, October 07, 2002 5:30 PM
Subject: [IAWA Forum] questions?


> just some queries about intercellular spaces and unlignified
> paraenchyma
>
> In Wetmore's paper (in 1930s or 1950s? - havent' found reference yet) on
> intercellular spaces in trees (emphasis on gas exchange and lenticels)
> did he have information on the occurrence of intercellular spaces?
> Bolton, et al. 1975 IAWA Bull. 171 2: 3-12 reviewed interstitial
paces  --
> mostly in Araucariaceae.
>
> are there usually / always longitudinal interstitial spaces in the woods
that
> have radial interstitial spaces?   or are radial intercellular spaces more
> common?  How big of a volume does the system  of intercellular spaces
> represent, is there some way of using serial tangential sections and
> image analysis to estimate the volume?   -- and are there always blind
> pits from the parenchyma into the intercellular spaces? [see Panshin &
> deZeeuw 4th ed. p. 124]?
>
> Re unlignified parenchyma -- probably Carlquist's 1991 paper has
> information on unlignifed parenchyma in vines.
>
> see Panshin & DeZeeuw 4th edition, p. 151 re lignification of ray
> parenchyma cells being delayed in some pines.
>
> Carlquist, S. 1991.  Anatomy of vine and liana stems: a review and
> synthesis. Pp 53--71 In: F.E. Putz and H.A. Mooney (eds.), The biology of
> vines, Cambridge University Press, Cambridge.
>
> > Hi,
> > Answering Dr. Tyree regarding unlignified rayparenchyma:
> > I am currently working with Urera caracasana(a tree) and U. eggersii (a
> > liana). Both of them present zones of lignified and unlignified
> > parenchyma. The liana has very wide rays, with alternating zones of
> > lignified and unlignified parenchyma. This species has a way to secure
> > tangential water movement across these wide rays, producing vessels
> > which run almost horizontally, comunicating  areas of vessels to both
> > sides of the rays. However, we do not have evidence of how this liana
> > copes with radial water transport through thes exceptionally wide rays.
> > I made resin-casrtings of Urera stems, but unfortunately, parenchyma
> > tends to fall appart in individual cells. Only vessels form nice casts.
> > By the way, I would appreciate refrences on unlignified parenchyma.
> >
> > Guillermo Angeles
> > Instituto de Ecología, A.C.
> > Depto. de Productos Forestales y Conservación de Bosques
> > Km. 2,5 Carretera Antigua  a Coatepec No. 351
> > Congregación ?El Haya?
> > 91070 Xalapa, Veracruz
> > México.
> >
> >
> >
> > MelTyree@aol.com ha escrito:
> >
> > > 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
> >
> > --
> > Guillermo Angeles.
> > Instituto de Ecología, A.C.
> > Depto. de Productos Forestales y Conservación de Bosques
> > Km. 2,5 Carretera Antigua  a Coatepec No. 351
> > Congregación "El Haya"
> > 91070 Xalapa, Veracruz
> > México
> >
> > Tel. (228) 842 18 35
> > Fax  (228) 818 7809
> >
> >
> E.A. Wheeler
> Professor Emeritus
> WPS, Box 8005
> Department of Wood & Paper Science
> Raleigh, N.C. 27695-8005
> USA
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