Re :Re: HYB: Paltec
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I just reading your answer Sharon, very informative !
If any member of iris-talk take a PALTEC photo, please post it urgently...
Jérôme
from France zone 7
----- Message d'origine -----
De : Sharon McAllister <73372.1745@compuserve.com>
À : <iris-talk@egroups.com>
Envoyé : mardi 19 septembre 2000 21:12
Objet : [iris-talk] HYB: Paltec
>
> Message text written by Dennis Kramb:
>
> >
> Is Paltec totally sterile? Is it diploid? I just received a piece of it
> and started wondering if I could use it in my hybridizing efforts.
> <
>
> The easy question first: PALTEC is a 26-chromosome diploid.
>
> Whether you use it really depends on your basic approach to hybridizing --
> so, for the benefit of any newcomers who may share your curiousity, I'm
> going to digress a bit in answering that part of the question.
>
> At one extreme is the hybridizer who wants to be able to cross any two
> breeders with the expectation of a reasonable number of seedlings of
> predictable type. Many have followed this proven path to success. To
> join them, you must limit your breeding stock to members of the same
> fertile family. They would tell you to forget about PALTEC and I would
> agree completely, IF this were the approach you had chosen.
>
> At the other extreme is the experimenter who is more interested in
> information than introductions. Not only is this the "path less
traveled",
> but the iris world may remain completely unaware of them. Tom and Wiloh
> Wilkes are an exception that quickly come to mind. They did introduce a
> few iris, but their significant contribution was a combination of
> information and breeding stock. They made a lot of crosses exploring the
> origin and future possibilities of the C. G. White amphidiploidlike
> hybrids. Wiloh corresponded with many hybridizers and freely shared
> seedlings, as evidenced by the frequency these appear in registered
> pedigrees. Tom wrote technical articles for both AIS and ASI
> publications. PALTEC is just the type of subject that such experimenters
> relish!
>
>
> Now, should you choose to take up the challenge....
>
> Purge the word "sterile" from your vocabulary. Fertility is relative.
> PALTEC is an interspecies diploid, like WILLIAM MOHR but with different
> ancestry. Consider how long WILLIAM MOHR was dismissed as "sterile" and
> then look at the long list of offspring that were produced after
compatible
> mates were discovered. PALTEC's current position is much like that of
> WILLIAM MOHR until the late 1940s -- except that, according to TWOI, it is
> probably the sole survivor of its type.
>
> We have the advantage now, though, of knowing more about chromosome
> conjugation and that means we can confidently map out an experimental
> program for it.
>
> 1. Cross PALTEC with tetraploid beardeds. This is most likely to
> produce BBB- or BBT-type triploids, but can sometimes produce a BBBT-type
> tetraploid. Cull the BBBs by selecting for tectorum characteristics.
>
> 2. Cross F1 seedlings back to PALTEC. It's a long shot, but
> unbalanced diploids do sometimes produce unreduced gametes and an F1's
> BT-type gametes are the right type to fertilize an unreduced gamete and
> thus produce a fully fertile amphidiploid in the second generation.
>
> 3. Cross F1 seedlings among themselves. Not quite as much of a long
> shot, but among all the non-viable combinations is the BT + BT, so this is
> another way to get a fully fertile half tectorum in the second generation.
>
> 4. Cross F1 seedlings with tetraploid beardeds to widen the bearded
> portion of the gene pool. Again, cull any BBB- or BBBB-types by selecting
> for tectorum characteristics.
>
> What we can NOT predict is how long it will take to get any F1 seedlings
at
> all, or any F2 seedlings -- much less when the fertility barrier might be
> broken. But you can certainly have some fun along the way.
>
> Sharon McAllister
> 73372.1745@compuserve.com
>
>
>
