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SDB F1 Seedling (Baby Blessed x Brash)

  • Subject: [PHOTO] [iris-photos] SDB F1 Seedling (Baby Blessed x Brash)
  • From: Dan Meckenstock dmeck@eaglecom.net
  • Date: Tue, 18 Apr 2006 09:18:31 -0500

This little odd-ball is an F1 segregate from a cross between Baby 
Blessed and Brash. Both parents are yellow and in addition Brash has an 
anthocyanin spot on the falls. This F1 seedling, which I have designated 
06 SDB 1237, is a carotenoid white and has two standards and three 
falls, also remnants of the anthocyanin spot contributed by male parent 
Brash is apparent. The importance of this flower is that it is evidence 
that both Baby Blessed and Brash are hetero-whites and that they have a 
common white genotype. By hetero-white, I mean both dominant and 
recessive alleles are present at one of the white carotenoid loci and 
that this heterozygosity is at the same loci in each parent. This may 
not seem important, but if you are trying to develop a lycopene red 
iris, it is my premise that all white loci that precede lycopene in the 
carotenoid pathway be homozygous dominant. It is also my premise that 
there is so much heterozygosity in today's irises that most irises are 
hetero-whites and therefore a high concentration of lycopene can not be 
accumulated until all recessive white alleles in the flower have been 
eliminated. Granted, this phenomena appears with two yellow parents, but 
if we look for it, I am sure we will find it in the pinks as well. The 
problem as I see it, is selecting out these white recessive alleles in 
order to develop darker yellows, reds, and oranges. So one thing you 
want to look for in your crosses, is whether you have white segregates. 
If you getting white segregates (even at low frequencies), then you know 
your parents are hetero-whites and probably should not be used when 
going for darker pinks or red.

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