Re: Re: TB: HYB: backcrosses

*nodding head* mmm hmm...
interesting, perhaps the 50 chromosome cultivars are another area for myself to consider pursuing?
thanks...
steve m - z4b - duluth, mn - where to begin? ... oh well, it's all fun and interesting!
 
 
 
 arilbredbreeder@cs.com wrote:In a message dated 10/18/2002 10:35:04 AM Mountain Daylight Time, 
lmann@volfirst.net writes:


> Sharon McAllister was encouraging trying to breed some of the 50
> chromosome cultivars to possibly bring out some new traits.
> 

Rather than send those who interested straight to the archives, I'll offer a 
brief [for me] explanation:

1.    The 50-chromosome cultivars appeared during the diploid to tetraploid 
conversion period and some clearly performed as amphidiploids.  I strongly 
suspect that they would have proven to be a fertile family if someone had 
focused on exploring them, but they were compatible enough with the 
48-chromosome tetraploids that for all practical purposes the 48-, 49- and 
50-chromosome cultivars were lumped together as tetraploid breeders.  The 
resulting stabilization process led to today's essentially autotetraploids -- 
but the price was the loss of some chromosomes and the traits they carried.

2.    The elimination of dominant traits has been a key factor in the 
progress made during the intervening decades.  Sometimes this has been 
intentional, as in breeding out undesirable traits.  Sometimes it has been 
the natural byproduct of a program breeding for recessive ones.

So my plan was to look for desirable traits in this historical group and 
cross to modern cultivars to determine whether they are dominant or 
recessive.  When one proves to be dominant, it can be retained by 
line-breeding without further backcrossing.

Sharon McAllister


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