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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.  
'Tain't easy. 

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, 
still-unproven suspects.  

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.

Sharon McAllister


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