Re: HYB:Dominance in Iris
iris@hort.net
  • Subject: Re: HYB:Dominance in Iris
  • From: i*@aim.com
  • Date: Mon, 01 Mar 2010 10:15:36 -0500
With the tangerine factor I have noticed subtle differences? beween a Tttt,
and a TTtt, it is a subtle difference? that? is hard to detect.? Basically T
is quite dominant, about 90%. I haven't been able to learly detect any
difference between a TTTT and a TTTt.

With 'I',( the dominant inhibition of anthocyanin), I haven't seen any such
cumultion effect. For example, Garden Bride, is a pure white from a cross of a
white seedling with Breakers. I is quite dominant over i (straight blue)

Where you can get shaddings of different blue is where you have Ae
(anthocyanin enhancement gene, the gene that seems to be responsible for
anthocyanin vascular intrusions) in various combinations with 'I'. 'I" is only
partially dominant over 'Ae' so you do get various shades of blue. I also
suspect that thiis is how you get the whites or near whites with dark blue
beards. This is likely one Ae and several 'I" genes in combination.

So I would guess 'I' is about 95-100%? over 'i', it is about 60-75% dominant
over 'Ae", or partially dominant.? It is quite clear that a (Ae,Ae,ae,ae?
Iiii) plant is still? dark purple.? The other combinations haven't been
clearly set, and may not ever be because of modifier genes of the flavinoids.
But very likely responsible for much of the variation in shadding of blues we
see.

Chuck Chapman







-----Original Message-----
From: christian foster <flatnflashy@yahoo.com>
To: iris@hort.net
Sent: Mon, Mar 1, 2010 9:25 am
Subject: Re: [iris] HYB:Dominance in Iris




Betty,

Yes, I think it would be possible for us to attempt to arrange what we know
about iris genetics in a ladder.  Actually I think some of us already do, like
SA, BC, and Plicata, and those who work with the tangerine beards.

>From what I have read on posts, the part of the ladder dealing with
anthocyanin/I inhibitor might look something like this:  (if I remember
correctly off the top of my head I is a dominant)

IIII (an anthocyanin self blue iris expressed as white or icy blue)
IIIi  a very pale blue iris
IIii  a medium blue iris
Iiii   a darker blue iris
iiii  ?  in theory it would be a true anthocyanin blue iris.

I think there has been some discussion on this group about whether an iiii
iris
is even possible... don't remember an outcome...  In addition, there has been
some discussion that there is a second type of anthocyanin expression in which
the pigment can appear in clumps or packets...( APT  ? ADP?  something)

Thusly, a tangerine t ladder would look like (t is the recessive tangerine)
TTTT --
TTTt --
TTtt --
Tttt --
but I've never paid enough attention to the tangerine discussions to fill in
the
expression information.

I think I noticed that Cindy expressed the rabbit ladder alphabetically, but I
could only guess whether this is a rabbit convention or Cindy's own personal
preference.

I know there has been some mention lately about the wiki project, and while
this
ladder may not be something that "fits" into that project, we could use the
wiki
format to create a ladder. The wiki format is intended to allow for this type
of
collaborative creation of documents...  I may remember someone telling me that
gmail... or maybe something related to Google has the same multi user
capabilities.

Or we could just rename this thread and do it cut and paste style right here.

Christian






________________________________
From: "autmirislvr@aol.com" <autmirislvr@aol.com>
To: iris@hort.net
Sent: Mon, March 1, 2010 8:17:53 AM
Subject: [iris] HYB:Dominance in Iris

To my knowledge there is no "ladder of dominance" as Cindy describes.  Would
it be possible to arrange iris genetic in this manner?


Betty Wilkerson
Bridge In Time Iris
SoCn KY Zone 6

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