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  • From: "Lawrence F. London, Jr." <lfl@intrex.net>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: Re: [permaculture] phragmites end-of-thread
  • Date: Mon, 21 May 2007 23:51:25 -0400

rafter t. sass wrote:

I will see if I can turn up anything at gardenweb.



As for "of course you can use it for compost," if you dig just a little further into those google results you find enough scientific studies indicating allelopathic effects from root exudates and foliage to give pause before applying it to your garden.

Maybe activated charcoal will work:
-
PDF] Ecological Genetics of Plant Invasions: a Case Study on Alliaria ...
File Format: PDF/Adobe Acrobat - View as HTML
Chapter 5 investigates allelopathy as a potential mechanism of Alliaria invasion, ... where activated carbon was added to neutralize contamination. ...
www.dissertationen.unizh.ch/2005/bossdorf/diss.pdf - Similar pages - Note this

Here's a fragment of a nonworking link with a hint about neutralization of
allelopathy
-
[PDF] Allelopathy of Aquatic Autotrophs
File Format: PDF/Adobe Acrobat
such as Phragmites australis and Typha latifolia,. both growing frequently in the same littoral area. ... evolution leading to the neutralization of the ...
taylorandfrancis.metapress.com/index/J7GC9XCGBYVALRLC.pdf - Similar pages -
Note this

><

http://www.2007.botanyconference.org/engine/search/index.php?func=detail&aid=991
Abstract Detail
Environmental physiology
Rudrappa, Thimmaraju [1], Justin, Bonsall [2], Gallagher, John L. [3],
Seliskar, Denise M. [4], Harsh, Bais [5].

Root-secreted allelochemical in the noxious weed Phragmites australis deploys a reactive oxygen species response and microtubule assembly disruption to execute rhizotoxicity.

An experimentally proven phenomenon described as “novel weapons hypothesis” (NWH) relates to the growth suppression of the native species by secretion or production of allelochemicals from exotic and introduced plants. Phragmites australis is considered the most invasive plant in marsh and wetland communities in the eastern United States. Although, allelopathy was superficially suggested as the main displacing mechanism in P. australis, there has been minimal success in characterizing the responsible allelochemical. We tested the occurrence of NWH in the invasion of P. australis. To this end, the root exudates of two P. australis genotypes, BB (native) and P38 (an exotic) were tested for phytotoxicity on different plant species. The treatment of P. australis root exudates on the susceptible plants resulted in acute rhizotoxicity. The root exudates of P38 were more effective in causing root death in susceptible plants compared to the native BB exudates. The active ingredient in the P. australis exudates was identified as 3,4,5-trihydroxybenzoic acid (Gallic acid: hereafter GA). We tested the phytotoxic efficacy of GA on various plant systems including the model plant Arabidopsis thaliana. Most of the tested plants succumbed against the GA treatment with an exception of P. australis itself. Mechanistically, GA treatment generated elevated levels of reactive oxygen species (ROS) in the treated plant roots. Further, the triggered ROS mediated the disruption of the root architecture of the susceptible plants by damaging the microtubule assembly. The present study also showcases the involvement of in soil growth inhibitory effects of P. australis against A. thaliana with the increased persistence of the exuded GA in the P. australis’s rhizosphere.

Keywords:
Phragmites australis
root exudation
allelopathy
gallic acid
reactive oxygen species
microtubule.

Presentation Type: Plant Biology Abstract
Abstract ID:991

<>

So, how to defeat the gallic acid? Would rock dusts be of any use?
How active, if at all, is GA after composting? composting with rock dusts and
compost tea? other mixes?
What neutralizes gallic acid? high calcium limestone? crab meal, alfalfa
meal, granular seaweed?
Over watering to leach the allelopathic chemical?

Before abandoning us for GardenWimp, explore this a little further.
--
Lawrence F. London, Jr.
Venaura Farm
lfl@intrex.net
http://market-farming.com
http://market-farming.com/venaurafarm
http://venaurafarm.blogspot.com/
http://www.ibiblio.org/ecolandtech





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