[Plant-education] Re: cypress knees

David R. Hershey via plant-ed%40net.bio.net (by dh321 from excite.com)
Mon Apr 9 10:01:22 EST 2007


This question came up before in this group and the following review
article was mentioned:

Briand, Christopher H. 2000. Cypress Knees: An Enduring Enigma.
Arnoldia
60(4):19-25.
http://arnoldia.arboretum.harvard.edu/pdf/articles/606.pdf

There are several hypotheses for cypress knee function but no
definitive evidence for any of them.

David R. Hershey



On Apr 9, 8:03 am, "Jensen, Douglas" <Doug.Jen... from Converse.edu> wrote:
> I have the same memory as both of you, but no references.  And yes, they
> could have no adaptive function.
>
> Personally, I doubt that the knees would add enough ballast to be
> particularly effective.  However, I think they could function to
> interlock the root systems of neighboring trees.  By doing that, a
> cluster of trees would become very stable in a storm.  I haven't seen
> this published, however.
>
> ________________________________
> Douglas P. Jensen
> Assistant Professor and Chair of Biology
> Converse College
> Spartanburg, South Carolina, 29302
> douglas.jen... from converse.edu
> (864)596-9123
>
> -----Original Message-----
> From: plant-ed-boun... from oat.bio.indiana.edu
>
> [mailto:plant-ed-boun... from oat.bio.indiana.edu] On Behalf Of Janice M.
> Glime
> Sent: Sunday, April 08, 2007 9:45 PM
> To: Carrie DeJaco
> Cc: Plant... from magpie.bio.indiana.edu
> Subject: Re: [Plant-education] cypress knees
>
> Carrie,
>    I don't have the reference at hand, but your memory matches mine.
> They were
> unable to show that cypress knees provided oxygen.  Some think they may
> help to
> add ballast.  Perhaps they are a response with no adaptive value, like
> tumors.
> Janice
>
> Carrie DeJaco wrote:
> > Anyone out there know the function of the "knees" of cypress trees in
> > swamps?  I had thought they were to relieve oxygen stress on the
> > waterlogged roots, but seem to remember hearing that that had been
> > disproven.  Any thoughts?
> --
> *****************************************
> Dr. Janice Glime, Professor
> President of IAB; Manager of Bryonet
> Department of Biological Sciences
> Michigan Technological University
> 1400 Townsend Dr.
> Houghton, MI 49931 USA
> email: jmgl... from mtu.edu
> phone: 906-487-2546
> fax: 906-487-3167
> *****************************************
>
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