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Re: Thorns on Aroids

  • Subject: Re: Thorns on Aroids
  • From: brian lee <lbmkjm@yahoo.com>
  • Date: Thu, 5 Mar 2009 14:56:20 -0800 (PST)

Dear Beth, Julius, and all,

Aloha.

What you are describing is allelopathy and allelochemicals or alleopathic compounds.  I do not know the specifics on Ceiba, but this may be happening on the younger trees and modifies in the mature giants.  Normally allopathy involves the roots, but there is nothing to prevent the release of these biochemicals on the stems and leaves.

Aloha,

Leland


--- On Thu, 3/5/09, ju-bo@msn.com <ju-bo@msn.com> wrote:

> From: ju-bo@msn.com <ju-bo@msn.com>
> Subject: Re: [Aroid-l] Thorns on Aroids
> To: aroid-l@gizmoworks.com
> Date: Thursday, March 5, 2009, 1:08 AM
> Dear Beth and Friends,
> 
> These Silk Cotton trees may be exibiting a condition (whose
> name I can not recall at this moment!) where some species of
> tree exude ''something'' which prevents to
> growth of competing vines, etc.  Here in Florida nothing
> will grow under the branches/drip- line OR climb a  Norfolk
> Pine, and I believe Australian ''pines'' and
> even  native Floridan pines demonstrate this
> "ability"!
> Perhaps someone ''out there'' has
> additional information on this one?
> 
> Good Growing,
> 
> Julius
> 
> From: desinadora@mail2designer.com
> To: aroid-l@gizmoworks.com
> Date: Mon, 2 Mar 2009 09:14:50 -0800
> Subject: Re: [Aroid-l] Thorns on Aroids
> 
> 
> 
> Leland, I wonder if there's a chemical that the Ceiba
> thorns exude that make it inhospitable to plants - it's
> not just Aroids that won't grow on them when they've
> got the thorns, they're completely free of competing
> species.  Not even moss or lichen will grow on that bark! 
> It's not particularly delicate or easy-sloughing either,
> just very very smooth over the thorn surface.  Here at
> least, the thorns comprise the entire bark surface for the
> first 100 years or so of the tree's life.  After that,
> it becomes a veritable epiphyte condominium, although the
> tree continues to produce some substance that inhibits the
> growth of strangler figs.  I'd be interested to find
> out, but I have no clue how to go about testing for an
> unknown tree phytotoxin.  It's not obvious, the way that
> it is for walnuts - although oddly enough, a slightly thorny
> Anthurium does tend to colonize these with no ill effects,
> even though the walnuts are suppressing all other plant
> growth in the area.  I'm at a loss to explain that one.
> 
> 
> 
> 
> 
> Beth
> 
> 
> 
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