Re: Re: TB, lumis, plics, Silverado

----- Original Message -----
From: "Neil A Mogensen" <neilm@charter.net>
To: "Iris-talk" <iris@hort.net>
Sent: Saturday, February 08, 2003 4:17 PM
Subject: Re: Re: [iris]TB, lumis, plics, Silverado


> Christian,
>
> Yes, there are two different kinds of plain white iris that are not
plicata,
> luminata or glaciata, or at least not visibly so.
>
> The majority of white, pink, yellow, or orange iris (remember Keith
Keppel's
> "canvas") carry a genetic factor which interupts the synthesis of the
> blue-violet pigment.  The symbol usually used for this is "I" (that's an
> 'eye') for "Inhibitor."
>
> A few whites (or, rather, non-blues/violets) do not have the genetic
capacity
> to form the blue-violet pigment and thus are white (or yellow, pink,
etc.).
> These are recessive whites.  Recessive whites do not look like
glaciatas--they
> do have some haft marks.  Glaciatas do not.
>
> The problem with the "I" whites is that "I" does not prevent the formation
of
> *some" blue-violet pigments, so varieties such as *Silverado* --which IS a
> dominant "I" white--end up ice blue or light blue-violet in spite of the
> inhibitor.  You might note that the parentage of Silverado is (orchid x
dark
> violet from blue and black breeding) X white (dominant type).  The
pigments
> involved in the blacks tend to penetrate through the "I" factor.  They are
a
> bit different from ordianry Iris blue-violet and presumably come from I.
> aphylla.
>
> Does this help?
>
> Neil Mogensen  z 6b/7a near ice-box Asheville where it just barely got
above
> freezing today
>
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