RE: [compost_tea] Brassicas and vam fungi

From: Tom Jaszewski <tom_at_livesoil.com>
Date: Sat, 30 Oct 2004 09:18:15 -0700

 

 

-----Original Message-----
From: clay [mailto:clayc_at_westnet.com.au]
Sent: Friday, October 29, 2004 8:50 PM
To: compost_tea_at_yahoogroups.com
Subject: [compost_tea] Brassicas and vam fungi

 

A soil consultant came to look at our community garden and said that we
shouldn't be growing anything from the brassicaceae family as intercrops
because its root exudates kill VAM fungi, and crops that rely on VAM fungi
will suffer. We were growing broadbeans, and wild radish was growing with
them...it was a weed that I hadnt got around to removing yet.

I know that some farmers are using brocolli to reduce nematode problems in
tomatoes, but if they are also killing VAM then maybe they are not so
usefull.

Can anyone comment on this being true or not?

 

 

 

[Tom Jaszewski]

Lots of good stuff to read on this question!!!

 

[Tom Jaszewski]
http://www.biologie.tu-dresden.de/botanik/LS/Physiologie/Forschung_engl.htm

"Although the majority of higher plants is able to form a symbiosis with
members of the order Glomales, this is rarely found within the family of
Brassicaceae, Chenopodiaceae, Capparaceae, Resedaceae and a few others. For
the Brassicaceae, this was attributed to the occurrence of the degradation
products (thiocyanates and isothiocyanates) of glucosinolates which were
shown to have an inhibitory effect on spore germination of AM fungi.
Glucosinolates are secondary plant metabolites mainly found in the family o=
f
Brassicaceae, but they have also been reported from other plant species. Th=
e
latter include nasturtium (Tropaeolum majus) and pawpaw (Carica papaya). It
was demonstrated in our lab that the glucosinolate-containing plant species
T. majus and C. papaya form functional symbiosis with Glomus and Gigaspora
asshown by the formation ofarbuscules and/or vesicles. Our future goal is t=
o
identify strategies that may allow the colonization of Brassicaceae by
arbuscular mycorrhizal fungi so that this plant family can also benefit fro=
m
the sybiosis."

 

[Tom Jaszewski] http://botit.botany.wisc.edu/courses/mpp/MycolEvol109.htm

 "Most members of the Brassicaceae are non-mycorrhizal,"

 

http://herkules.oulu.fi/isbn9514269888/html/c83.html

"The majority of the plant kingdom have mycorrhiza, but certain taxonomic
units, families such as Brassicaceae, Caryophyllaceae, Cyperaceae and
Juncaceae are largely non-mycorrhizal (Newman & Reddell 1987, Trappe 1987,
Peat & Fitter 1993)"

 

Regvar M, Vogel K, Irgel N, Wraber T, Hildebrandt U, Wilde P, Bothe H (2003=
)
Colonization of pennycresses (Thlaspi spp.) of the Brassicaceae by
arbuscular mycorrhizal fungi, submitted

 

"Although the majority of higher plants is able to form a symbiosis with
members of the order Glomales, this is rarely found within the family of
Brassicaceae, Chenopodiaceae, Capparaceae, Resedaceae and a few others. For
the Brassicaceae, this was attributed to the occurrence of the degradation
products (thiocyanates and isothiocyanates) of glucosinolates which were
shown to have an inhibitory effect on spore germination of AM fungi."






Regards,

tomj


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Received on Sat Oct 30 2004 - 14:19:34 EDT

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