Re: HYB: pigment question - red beards?
iris@hort.net
  • Subject: Re: HYB: pigment question - red beards?
  • From: C* C* <i*@aim.com>
  • Date: Mon, 7 May 2012 10:01:05 -0400 (EDT)
The tangerine factor X 4 gives tangerine/red beards. This is a primary Mendel trait. the intensity is likely a multi-factor or modifier trait. So needs F2 to get some of it back.
Traditionally white with red beards have intenser red beards. Three possible factors. 1) contrast effect. Comparing beard to white will always make red seem more intense then contrasting it to pink 2) Concentration effects. That is all of lycopene pigment goes into beard, none into petals , so more concentrated 3) to get red with lycopene. you also need some yellow. It happens this way with tomatoes. A cultivar without beta-carotene is pink. all red tomatoes have 20-40% of pigment is yellow. Because of how pigment is produced at molecular genetic level it is easier to get combination of lycopene and yellow with white with tangerine beard and with yellow with tangerine beards.
So for a pink with intense red beard, I would start with reddest bearded pinks. The red bearded whites (and red bearded yellow) won't get you there as different chemical process with white, which disappears with pink flowers. 

Chuck Chapman



-----Original Message-----
From: Linda Mann <lmann@lock-net.com>
To: iris <iris@hort.net>
Sent: Mon, May 7, 2012 8:51 am
Subject: [iris] HYB: pigment question - red beards?


A question from a local iris breeder working on red-bearded white
irises.  He says he crosses the reddest bearded whites (or whatever)
with the reddest beards he can use, and is frustrated that most of the
seedlings have beards that are less red, more orange than the parents.

I wondered if maybe the true red beards have some blue or other pigment
mixed in, whether maybe some other color beard crossed with red would
give a higher percentage of true red beards.

Any of you know the trick to getting/keeping the 'true' red beards?  Or
know anybody who would know?

Seems like, if it was 'just' fully recessive, crossing two red beards
would give mostly red beards.

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