Re: Re: HYB: ploidy - speculation

When you cross a dip with a tet, how can you tell what the offspring 
are?  

The seedlings that die early - how do we know they are dip or tet?  I 
guess it depends on the stage of their growth before death and 
whether chromosome counts were done.  I mention this because I have 
read the phrase 'tetraploid seedlings' from colchicine experiments 
when the seedlings, in fact, died.  I think they might have been 
labeled tet too soon - before they were tested or were of any size to 
speculate about their ploidy.

I know with some tet La's, you can tell they are tet by looking at 
the foliage - the Mertzweiller tets have larger and darker leaves and 
can be spotted as tets by sight.  Can bearded tets from dip x tet 
crosses also be spotted by sight, or must a count be done?

But, then, I think of some West Coast bearded irises with skimpy, 
narrow foliage from inbreeding lines of tet x tet.  So, how can you 
tell?

Will the variegated foliage breeders be able to tell dip from tet 
seedlings on sight before tests and bloom?  Will the bloom tell?

I have almost as many questions as Linda!   :-)

Walter Moores
Enid Lake, MS 7/8 USA (Where it never gets as cold as the weathermen 
predict, thank goodness!  We have not had a three-dog night yet).


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