Re: RE: HYB: Suppressed purple in pink

In a message dated 7/17/2004 12:23:02 PM Mountain Daylight Time, 
MryL1@msn.com writes: 
> My first bloom this spring on Pagan Pink showed a purple chimera (half a
> standard and all the underlying fall).  I'm just past "See Spot run" in iris
> genetics, so I don't really understand how a recessive pink could be 
> carrying
> purple and not express it all the time.  

Trying to keep this super-simple:

The pink and purple pigments function independently.  The pink is one of many 
pigments that occur in the cell walls, while the purple occurs in the cell 
sap.  This is why pink and purple can appear in the same cell.

Pink is indeed recessive -- to a closely-related yellow pigment in its group.

Purple is normally dominant within its own group, but there is an Inhibitor 
that can suppress its expression. 

So Pagan Pink looks pink because it carries a full complement of the genes 
for recessive pink and the inhibitor that keeps the purple from being expressed. 
 It sounds like something interfered with the function of the inhibitor in 
portions of the flower you've described.  Weather during bud development is 
often the culprit -- so it should be interesting to see what happens the rest of 
the season.

Sharon McAllister

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