Re: Re: Plicatas - yellow

Hi Keith

Light Beam is a great grower for me. 
I've would consider that it has a yellow ground with a faint exprssion of rose 
plicata marking which when over the strong yellow base colour gives an 
appearence of brown. The plicata like markings are definitley stronger at the 
hafts. Given that Broadway is a rose plicata this is likely, but does BS carry 
plicata?


Colleen Modra.


Quoting Keith Keppel <plicataman@earthlink.net>:

> To try and answer Juri's question about WHAT is a yellow plicata....
> 
> I like to think there is no such thing!  If "plicata" is a genetic
> factor for the distribution of anthocyanin pigments, then any yellow
> present I would expect to be totally due to factors controlling the
> ground.  But as we keep saying, the more answers, the more questions...
> 
> There are yellow pigments in some flowers which are of the water-soluble
> type, could one of these also occur in Iris?  If so, then perhaps the
> plicata factor could cause a true plicata with yellow markings.
> 
> In catalogues it is not uncommon to find the Joyce Terry/Debby Rairdon
> type irises referred to as "yellow plicatas", when of course they are
> not.
> 
> Light Beam is a good candidate for discussion.  From Broadway X Beverly
> Sills, it is registered as solid lemon standards, white falls stitched
> bright lemon.  Very close inspection shows that the yellow is not pure
> yellow, but has a very slight butterscotch tone.  My guess is that it is
> a ghost plic...a suppressed plicata, allowing very little anthocyanin
> pigment to show, superimposed on a (vaguely) Joyce Terry pattern.
> 
> I say vaguely, because there definitely is a shading of yellow from the
> edge in toward the center of the fall, and the yellow occurs not
> contiguously in all areas, but also in definite patches or dots....more
> in keeping with what we think of as a plicata-type pattern.   However,
> there are a number of yellow-and-whites which, in shading from edge
> toward center, show this unevenness to some degree, and these are
> varieties with no obvious plicata heritage.  The color is probably
> dictated by a distribution gene....but a gene which acts upon the
> oil-soluble carotenes, and not our plicata gene which targets the
> water-soluble anthocyanins.
> 
> I certainly don't know all the answers.  In fact, I'm not even smart
> enough to know all the questions!
> 
> **Keith , who used to live in California, where the cross for Light Beam
> was made.  Barry and Lesley Blyth were visiting from Australia and
> making a few crosses.  When  Beverly Sills pollen was put on Broadway, I
> criticized..saying Beverly Sills would not likely be appearing on
> Broadway, instead she'd be at the Met, so the cross of Metropolitan X
> Beverly Sills was also made.   Obviously she did her by-far-better
> performance on Broadway that year....
> 
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