UKTC Archive

RE: Ganoderma applanatum/australe on n.maple - implications

Subject: RE: Ganoderma applanatum/australe on n.maple - implications
From: Viper Snake
Date: Dec 23 2011 19:30:01

 
Hi Ian,
 
'ectomycorrhizal macrofungi such as Scleroderma citrinum, Paxillus involutus, 
Thelephora terrestris and Boletus badius, that do not seem to have lost their 
capacity to (temporarely) live as a saprotroph on and fruit from dead wood 
while "awaiting" to colonise the roots of a new partner and seem to refrain 
from retracting sugars for producing fruitbodies from the seedling and young 
tree partner until the tree can "stand on its own feet" by developing the 
foliage needed to produce enough energy (reserves) through photosynthesis to 
support itself and its tree species specific ecosystem, and can "afford" 
sharing the sugars with its symbionts, the mycelia need to fruit.'

As with endophytic fungi, would you regard the subtle decline within an 
ailing tree to trigger the growth, for example of Piptopurus betulinus on a 
Birch, to be possibly caused by a reduction in sugar/sap levels? The complete 
opposite perhaps of what you're suggesting where an ectomycorrhizal fungi 
fruits when sensing a rise in sugar levels prompted by the establishment of a 
tree....
 
1. Ectomycorrhizal macrofungi also "panic fruit" and become parasitic by 
withdrawing more sugars from a tree than it can afford (oaks without foliage 
with Russula amoenolens fruiting on the 6th of June instead of in 
September/October) when the tree is under constant and severe stress (Quercus 
robur : suffering from drought and from nitrification with loss of tree 
species specific ectomycorrhizal symbionts as a result => 100 % defoliated by 
caterpillars, including OPM => then 30 % loss of energy production because of 
oak leave mildew on the secondary foliage) and the delicate balance of the 
tree and its ectomycorrhizal symbionts is severely disturbed for two or more 
years in a row.
 
2. I know of no evidence of this hypothesis, but I would not be surprised if 
this turned out to be the case and the with decline associated diminishing 
effectiveness of the defensive system of living tissues would play an 
important role too.
 
Regards,
Gerrit                                    


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