mating with cw strains

[rose leviticus]

I am setting crosses between mutant and cell wall-less strains of 
Chlamydomonas this week. I have it on good local authority that cw 
strains are notoriously hard to mate. So far I have tried what I think
is the normal procedure: resuspending fresh cells from acetate plates 
into N-free SGII, vortexing, and allowing gamete formation to proceed 
overnight in 1000-2000 lux. After mixing the partners, I allow mating 
to proceed for 2 hours in the light before plating. I incubate the 
maturation plates in bright light (4000 lux) overnight before putting 
them in the dark for a week. 

It is to soon to see zygotes, but I would like to know if there are 
some special changes to this procedure that improve the success for cw
strains, and that I can include in crosses I am setting later this 
week.  

I have noticed that according to our local test electronic newsgroup 
my name is "rose leviticus". I doubt that answers mailed to her will 
reach me. My real name is Roel Funke and my electronic address is

rfunke at unlinfo.unl.edu

I'll get that straightened out. 

Thankyou.

Roel