controlled water stress in conifers

Darren Goetze goetze at UNIXG.UBC.CA
Wed May 3 16:26:44 EST 1995


dear netters,

i'm doing some experiments involving water stress in white spruce. i'd 
like to be able to bring on the stress in a controlled manner and have 
found several groups that use polyethylene glycol, sorbitol, mannitol, 
etc. to lower the osmotic potential of nutrient solution the 
seedlings are placed in. optimally, i'd like to avoid placing the 
seedlings in a completely hydroponic setting. 

does anybody have experience with this type of set-up? is there a 
preferred osmoticum (i note that some write PEG is toxic to trees, others 
think sorbitol will be taken up by roots)? i'd like to use an established 
system. 

many thanx for any help/suggestions.

darren goetze
=============
dept of botany
univ british columbia
vancouver bc v6t 1z4
canada <-- Home of the fish-war pirates!!! 
                              (Who?...US?!......ahrrr billy! we be them!!)



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