Re: HYB: pigments & structure
All the genetic controls are inacted at some point through control of a biochemical production. The production of anthocyanin pigment is a 20 something chain. Nor sure what it is for the cartenoid chain. It requires any one of these steps to not function in order to turn off the production. the biochemistry of oil based and water based pigments don't have any biochemicals in common. The didtribution of anthocyanin pigment into certain aareas and not others reqiress localized turn off of production in certain flower parts. The common distributions requires some biochemical action that effects both pigments turning off at the same locations. This is what makes me thing of something that afects the cells in some way. The flower is stll white between the veins, not transparent, so the pseudobase anthocyanins are still present there in order to give the appearance of white. I can't conceive of any mutual chemical that can do this unless it is has some effect on the cell.
Certanly a puzzle. I don't know of anything similar in any other type of flower.
Date: Mon, 24 Jan 2005 16:43:55 -0800 (PST)
From: Walter Pickett <email@example.com>
Subject: Re: [iris] Re: HYB: pigments & structure
Something in the flower turns on genes for both oil-based and water-based color pigments..
In plicatas, this something might be confined to the veins. Or confined mostly to the veins.
Given that both types of pigment genes are turned on in flowers, there would likely be a step where they are signaled by the same whatever. Where they are both signaled once, it is not so far-fetched that they are both signaled again. A modification (mutation) of the origional signal could still trigger both, but at a different time or location.
Just thinking out loud here. You all know where the delete key is.
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