Re: RE: Red on White Plicatas.

Hi Chuck,

I think you answered some of your own questions. and did a pretty darned
good job at it too.  I went and looked at the pictures and found exactly
what I expected to see.  Where the anthocyanin is missing, the carotene
pigments are expressed.

As far as red on white ground is concerned, according to the World Of Iris,
there are six principal anthocyanidins which are responsible for producing
not just violet, but scarlet, crimson, and mauve as well.  There also may be
several variations of those colors produced depending on the soil PH.  Sugar
also plays a role in  the pigment molecule which will produce variations of
color. (not sure if the sugar and the soil PH are related).

Just wanted to throw that out there because it seems to me that scarlet,
crimson, and mauve may appear as "red" in some places without any carotene
pigments playing a part.

Patrick Orr
Phoenix, AZ Zone 9 - where PH is usually 8 and needs amended badly.
USA


----- Original Message -----
From: "Chuck Chapman" <irischapman@netscape.net>
To: <iris@hort.net>
Sent: Monday, February 24, 2003 9:16 AM
Subject: [iris] RE: Red on White Plicatas.


> If red and brown is a combination of carotene (yellow) and anthocyanin
(violet) pigments then what about red on white plicatas such as Taholah.
Harlequin, High Life, Broadway, Different Design and Spice Lord (as
examples)?  The red and brown colour is a combination of yellow and violet.
Shouldn't the anthocyanin and carotene be distributed in the same locations
to give us the red.
> What happens when the anythocyanin is absent in a red on white plicata?
Removed by a Dominant Reduction of Anthocyanin or a Recessive Reduction of
Anthocyanin.
>
> I have posted two sets of photos to Iris-photos that have me wondering
about this. One set has a photo of a violet-purple stripped on white ground,
a yellow stripped on white ground and a flower which has both anthocyanin
and carotene and is a red-brown stripped om white ground. The second set of
photos is of a chaisma of the IB Summer Camp where half of the petals have
no anthocyanin and on this part we see a pattern of yellow distributed in a
manner much like a plicata pattern. Darker in veins and at hafts, and more
pigment near the petal edges.
>
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