Re:TB, lumis, plics, Silverado

A dosage effect plays an influence here also as to how much anthocyanin
(blue) pigment gets inhibited.  From what I have read, if the offspring has
four doses of "I" in its genes, then it inhibits the expression of blue
pigment quite completely - (there will always be a little tiny bit
somewhere, maybe not visible until you break apart the petal and really
examine up close).

With only 3 of four doses of "I", you could end up with something that will
have the blue inhibited in part of the flower, perhaps like Conjuration
where there is just a band of blue color, or you could have a light wash.

With only 2 of four doses of "I", you could end up with something that will
have the blue inhibited in part of the flower in a lesser degree, and with
only 1 of four doses of "I" you could end up with something like Honky Tonk
Blues - where just the edge is slightly inhibited.  I am not sure if "I" is
actually taking place in HTB, but it looks like it.

What looks like other partially inhibited varieties I can think of off the
top of my head (and please don't quote me) are Bye Bye Blues, Undersea
Adventure, Age of Innocence, Calm Sea, Alizes, City Lights, Crystal Springs,
Fragrant Lilac, Corvette, Snow Burst, etc.

THEN, you have patterns where the inhibition to express the blue pigment
takes place in only the standards or only the falls.  When this happens, you
get neglectas & bitones such as Mariposa Skies and a few I mentioned above.
In Reverse is an example. The dosage, or amount of inhibited pigment in
either the falls or the standards is the reason you have bitones and
neglectas. The bitones only have some inhibition, the neglectas have a lot.

Amoenas have inhibited anthocyanin pigment in the standards. Reverse Amoenas
in the falls.

THEN if you overlay yellow, pink, or orange over a flower with "I" in either
all or part of the flower (in varying dosages), you end up getting bicolors,
more bitones, more color in the amoena class, and, now I am not exactly sure
on this, but some variagatas (although I think there are different factors
involved with variagatas).

You get Edith Wolford, Jurrassic Park, Gallant Rogue, Pheasant Feathers,
Sweet Musette, Colette Thurillet, and other various "Blends" and "Bands".

Just think of your eraser as "I".  If you can use your eraser to erase just
the blue pigment from a flower, you are left with either a lighter shade if
you don't erase too much, you are left with either yellow, orange, or pink
in its place if those colors are present and were overlaid with the blue
pigment, or you are left with white.

I hope this gets some of you out there thinking about what varieties to
cross this spring.

Patrick Orr
Phoenix, AZ  Zone 9
USA

----- Original Message -----
From: "Neil A Mogensen" <neilm@charter.net>
To: "Iris-talk" <iris@hort.net>
Sent: Saturday, February 08, 2003 2:17 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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