UKTC Archive

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

Subject: RE: Ganoderma applanatum/australe on n.maple - implications
From: Viper Snake
Date: Dec 21 2011 19:09:51

 
David,

1) There's no results of your research at the link. Have you published this 
research ? Has anyone else come to the same conclusions as you ?
1) Not on the internet and not in English, only in private communications 
among colleagues, as my research is still in progress and probably will be 
published next year. And no, this far all research on G. australe was done in 
vitro (Schwartze), i.e. not in situ and not on living trees.

2) Your definition of 'biotrophic parasite' - "meaning the parasite dies once 
the host is killed", from the link - doesn't fit with my experience of G. 
adspersum/australe colonies dying once the tree dies, or my understanding of 
the definition. I understood a biotroph to be something that required living 
tissue to feed off, which is both at odds with my first point and with G. 
adspersum/australe colonising heartwood or age-altered wood.
2) To produce FB's, all annual and perennial bracket fungi decompose (the 
sugar polymere cellulose of) the heartwood and convert it to the sugar 
polymere chitin (cell walls), in the process of which about 20 % of the in 
the wood stored energy is lost. Biotrophic parasitic macrofungi produce FB's 
in the same way, but they - other than necrotrophic parasites - need contact 
with living tissues to facilitate the process. Biotrophic fungal parasites 
only or predominantly feeding off living tissues would have an extremely 
short life cycle and would never be able to produce annual or perennial FB's 
of some magnitude, because they would kill the tree before the reproductive 
cycle of the mycelium could come to its full development.
And a question : Did you microscopically check and identify all specimen of 
G. australe and G. lipsiense documented from all tree species you found 
either one of these Ganoderma's on to be 100 % sure which one of both species 
you found on what tree species and if so, did you ever assess G. australe 
fruiting on/from dead wood alone ?

3) Has your research established that G. adspersum/australe invades and 
colonises functional living xylem?
3) Yes, just as all in situ research on living trees shows that all 
Ganoderma's and all other necrotrophic and biotrophic parasites do.

4) From my own field research on the effects on the stability and condition 
of different deciduous tree species of the biotrophic parasitic G. australe, 
of which the mycelium causes a white rot with selective delignification, that 
is most detrimental to Acer, Platanus, Populus, Salix, Tilia, Aesculus (Anne 
Frank tree) and Quercus rubra.
4) See 1)

5) And, in your first posting on this thread you said G. adspersum/australe 
was fatal to Acer. Is that what you meant, or are you qualifying it by saying 
it is more 'detrimental' to your listed genus above than the genus not listed.
5) Both times yes, with the addition, that it's even more detrimental/fatal 
to Acer saccharinum.
 
Regards,
Gerrit
 
 
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