Re:HYB:Glaciatas/green pigment
- To: i*@egroups.com
- Subject: Re:HYB:Glaciatas/green pigment
- From: p*@coupeville.net
- Date: Fri, 01 Dec 2000 07:13:06 -0000
--- 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
read,
> 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
recessive
> 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
plant
> which has solid colour, you could get any of the following
combinations:
>
> 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
the
> glaciata. Line breeding should bring the glaciata pattern back
fairly
> 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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