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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 ----- 
  From: arilbredbreeder@cs.com 
  To: iris-talk@egroups.com 
  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.  
  '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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