Re: HYB: Charting for Latent Traits
Sharon, what do you mean by "TBs with tangerine pink ground"? Would that be expressed as coral as on Beverly Sills?
I'm really grateful for this crash course.
Francelle Edwards with much to learn in Glendale, AZ
----- Original Message -----
Sent: Tuesday, November 28, 2000 9:42 AM
Subject: [iris-talk] HYB: Charting for Latent Traits
Now that you've had a chance to digest the theory a bit, let's go on to a
real-life, complicated problem.
Tangerine pink arilbreds have been elusive, in part because the anthocyanin
inhibitor that allows pink to show up with relative ease in TBs does not
affect the parallel aril pathways.
To get a pink arilbred, you must not only accumulate the requisite doses of
the t-factor [or eliminate the T-factor, depending on which model you accept]
but you must also suppress the purples from both TB and aril ancestors.
Significant progress has been made in pastel arilbreds, which seem to be a
genetic parallel to the glaciatas, and in yellow-ground arilbreds -- both of
which should be potentially useful in this endeavor. BUT, with no registered
tangerine-pink-ground arilbreds -- how do we spot potential carriers?
There was a time when seedlings that provided significant clues were so rare
that they were immediately reported through Robins & Newsletters. This is no
longer the case, but the principles are still valid.
One method is descendant analysis. WELCOME REWARD was from an onco hybrid X
PINK FORMAL. It thus carries two doses of the t-factor, which doesn't show
the pink. Any first-generation descendant can be assumed to carry one dose
and subsequent generations COULD carry one. The challenge is in ferreting
out the ones that actually do have it.
In this line, the problem has been in getting rid of the purples. Both
WELCOME REWARD and SHEIK still offer the potential of producing quarterbred
seedlings worthy of introduction and a number of their descendants are now in
distribution. ANY pink seedling produced by crossing one of these with a
pink TB is worthy of note if not of introduction. By charting its ancestry,
it's possible to not only identify the carriers in intervening generations
all the way back to WR -- but also to spot potential carriers in the lines
with which the WR descendants were crossed.
I have not yet produced a pink seedling from WR lines or received a report of
one -- but a similar analysis has led to pinks from another line.
Decades ago, there were reports of pink quarterbreds from KALIFA GULNARE and
ESTHER, THE QUEEN. A bit later, from IMARET and TUESDAY SONG As KG was
the pollen parent of both EQ and IMARET, and IMARET an ancestor of TS on both
sides, this combination isn't surprising. Of course, all four now have many
descendants in distribution. I have obtained pixelated pink [not pure pink
ground, but small areas of pink interspersed with small areas of yellow] in
seedlings with these on both sides of the family.
From charting their pedigrees, I have been able to identify ESTHER'S SON,
GRANTED WISH and SUNRISE IN GLORY as carriers -- as well as find other,
Soooo..... I'd say that anyone who grows one or more of the aforementioned
arilbreds AND has TBs with tangerine pink ground is in a position to conduct
an experiment that could not only be fun but offer the prospect of
quarterbreds worthy of introduction and information of great value.
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