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Re:HYB:Glaciatas/green pigment

--- In iris-talk@egroups.com, "Jan Clark" <janclarx@h...> wrote:
> >Crossing a glaciata to a non plicata would be like crossing a 
plicata >to a 
> >non plicata, except even worse. You would then have to work very 
>hard at 
> >bring plicata back in and even harder to bring glaciata back >in.
> Not having done a lot of hybridising, I don't speak from personal 
> experience, but my understanding of genetics tells me that this is 
not so.
> The alleles that can exist at the 'plicata' locus, from what I have 
> are:
> PL - the allele for solid colour, dominant to all the others
> pl - the allele for the plicata pattern
> plu - the allele for the luminata pattern, neither dominant, nor 
> to the plicata pattern
> pla - the allele for the glaciata pattern, recessive to all others
> If you cross a plant which has pla pla pla pla (a glaciata) with a 
> which has solid colour, you could get any of the following 
> PL PL pla pla
> PL pl pla pla
> PL plu pla pla
> PL pla pla pla
> but each seedling will have at least 2 pla alleles. When crossed 
back to a 
> glaciata,  the average percentage of glaciata seedlings produced 
will be 
> 25%. Another 25% of the non glaciata seedlings will have 3 alleles 
for pla, 
> and the rest will have 2.
> If crossed back to a sibling, an average of at least 1 in 16 
seedlings would 
> be glaciata, i.e.  6.25%
> Depending on what other alleles the solid colour plant 
was 'hiding', you 
> could get other patterns. Studying the ancestry of such cultivars 
would help 
> considerably.
> The idea that you would have to work through the plicata pattern to 
get to 
> the glaciata pattern is what I can't accept. Clearly the glaciata 
has no 
> plicata allele's present, and if it is never crossed with a 
plicata, or a 
> solid coloured cultivar, with plicata genes present, then there 
would be no 
> need whatsoever, to 'work through' the plicata pattern to get to 
> glaciata. Line breeding should bring the glaciata pattern back 
> quickly.
> Cheers, Jan Clark
> Wow, thanks, Jan.  This stuff is so fascinating.  And FUN.  I can't 
wait to make my first crosses and then -- though not soon enough -- 
see the results!

Patricia Brooks
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