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Re: RE: OT Plant cell biology - red


Actually identifing the gene for the particular anthocyanin is relatively
simply, working out where and how to put it in also not that hard. Problem
is that very little in nature works in isolation. There are always other
factors affecting gene expression, and these this is the problem, it's so

Interestingly it seems that no one species of plants produces the whole
range of anthocyanins. They either favour the red end (eg roses) or the blue
end (reg irises and delphiniums) and some like petunias produce the middle

Colleen Modra
Adelaide Hills AUST
zone 8/9

----- Original Message ----- 
From: "Neil A Mogensen" <neilm@charter.net>
To: "Iris-talk" <iris@hort.net>
Sent: Sunday, January 16, 2005 7:40 AM
Subject: [iris] RE: OT Plant cell biology - red

> That red of tomato sauce is not entirely due to Lycopene, I've read.  Some
> other pigments--and perhaps co-pigments--are involved.  Can't get much
> than ketchup, can it!
> Extractions from tomatoes separate out the pigments.  The Lycopene
involved is
> decidedly on the yellow side of red.
> Yes, an orange-red iris would be astounding, would it not!  But I think
> Colleen's point about the blue rose is very apt.
> Seems to me, to transplant a genetic sequence, one has to find it first.
> Which chromosome is it on?  Where on the chromosome is it?  What is its
> sequence?  The kicker in that is--"genes" can be from thousands into the
> millions of bp's (shorthand for "base-pairs") long!
> Then--worse yet--just where do you put it when you've got it?  The
position of
> a sequence on a chromosome has to be face forward, not face backward, and
> on the "sense" (left-hand) side of the double helix, and have its
> complementary sequence with it.  Put in backwards, it could simply kill
> cell, or do some wild and crazy things with the phenotype.  (More fun).
> Then--getting the cell to behave as though it were a gamete and begin to
> replicate an entire plant instead of some derivative tissue--as well as
> getting the cell to respond to the gravity gradient so a root develops at
> end and a stem (protorhizome) at the other, which is not easily done, even
> though the techniques for doing this were well under development more than
> forty years ago on things like carrot (Daucus carota--or something close
> that) slurry.
> The very thought of all this makes my head hurt.  No wonder millions of
> dollars, as Colleen mentions, have been expended on the blue rose project.
> I think OSU and Rick Ernst have their work definitely cut out for them.  I
> just wish they had tackled the anthocyanin project, not the Lycopene one.
> Neil Mogensen  z  7   western NC mountains
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