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Re: Re: HYB: pigments

  • Subject: Re: Re: HYB: pigments
  • From: christian foster <flatnflashy@yahoo.com>
  • Date: Sat, 1 Nov 2008 07:35:12 -0700 (PDT)


That actually clears up my question about the yellow/pink pigments
quite a bit.  


From: Linda
Mann <lmann@lock-net.com>
To: iris@hort.net
Sent: Saturday, November 1, 2008
8:03:33 AM
Subject: [iris] Re: HYB: pigments

Thanks Robin.

I get confused
about I vs recessive "white" (anthocyanin suppression). Somewhere, I got the
idea that recessive white expressed as a dosage, so if recessive white is wwww
(too lazy to look in TWOI or archives to check notation), all anthocyanin is
suppressed, but with smaller dosages, it's just paler in color.  So full
purple (with no I present) would be WWWW, somewhat lighter Wwww, etc to white

Whereas different I dosages express as patterns - Iiii is amoena, IIii
is ... rats I forget what I thought...IIII is dead? IIIi is white?

though I <know> that oil and water soluble pigment genes are inherited
separately, I still keep getting mixed up about the recessive whites for each
- I <think> it is more common in pink-yellow-orange lines I'm working with,
inc IMM, hence the range of yellows from her. Pale cream, the color of this
most recent seedling, to full yellow.  My assumption has been that IMM is at
least Iiii, and maybe WWww for pink-yellow. But I'm definitely not sure I know
what I'm talking about, nor if I do, whether or not my guess is right...
Nearly all of the crosses I've made with IMM have been with pinks (or pink
plus pattern), & they have yielded a few whites, but mostly creams &
occasional yellow.  The one cross I've made with a full purple (iiii & WWWW,
if that's the way to say it), gave nearly all full purple seedlings - I think
there was one white in the lot, and it was full white, no dilution, plus one
reddish neglecta (Robin, seedlings from it X GIR might be blooming size 2009)
that was not as dark.  IMM X (DUSKY CHALLENGER x GRAPE ICE). This purple cross
produced all full purple, from very dark to medium).  But there is some dark
pigment (those avi thingies) present in the DC kids to confuse things some

Not good numbers of seedlings tho, because there weren't too many
surviving seedlings from either cross - maybe 6 each.

<Though if the
were iiii, then you would not know what the tangerine expression was
you would have anthocyanin expressed, masking the pink.

Robin Shadlow
zone 5
-- Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society
Region 7, Kentucky-Tennessee
American Iris Society web site
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