RE: Glaciata diploids

There are no known diploid glaciata other then Kupari. The absence of diploid glaciatas was noted by Walter Welch and Bee Warburton who both puzzled on why this was so. The probable reason is that the glaciata gene is not in the breeding stock used in MTB breeding. Kupari could be used to bring this factor into the diploid MTB. ( There seems to be some glaciata tetraploid MTBs.)  Thus the plicata factor from pallida is not the glaciata gene found in Kupari. Kupari x pallida may bring out any hidden plicata gene. The theory is that the plicata gene is epistatic ( unactive as it performs some other fuction) in Iris pallida. I suspect that it is just not there. I have some test crosses under way and some more planned that may shed some light on what is going on. 

Chuck Chapman 


thomas silvers <tesilvers@yahoo.com> wrote:

>Chuck,
>I'm glad you're thinking that (about Iris variegata
>being the source of the plicata pattern). I've
>considered that possibility also. Maybe it is some
>variegata gene(s) that only produces that pattern in
>combination with certain pallida gene(s). It may be
>that neither of the species alone has all that is
>required for the pattern to be expressed. I'm
>interested to see if either of the other 'Kupari'
>crosses (suaveolens or cengialtii) produces any
>plicatas in the F2.
>
>As for existence of glaciatas in MTB class, I'd have
>to take your word for it. I've always just assumed
>that some of the plain yellows and whites were
>glaciatas; and thought that it was the dominant
>anthocyanin inhibitor that didn't exist at the diploid
>level. And it wouldn't surprise me at all, if the old
>historic plicatas (like 'Swertii', and others -- none
>of which I've grown), might be products of Iris
>variegata introgression into a primarily pallida
>background.
>
>I think you might be on to something. I'll definitely
>keep you up to date as any of these seedling groups
>begins to bloom.
>
>I'll attach a picture of one of the plicata seedlings.
>You should be able to view it at the Mallorn archives,
>if not directly. Note the pattern is especially
>evident on the unopened buds.
>
>
>


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