Re: Re: HYB: backcrosses, etc...

Hmmm.
Tom and Margie,
are we really in the minority here? Cool, maybe I can help uncover something new and interesting (or new and horrific)... I'm anxious to see what happens, regardless.
Tom... I hadn't ever read exactly where the various color patterns came from. It was interesting, to me, to learn how many Iris species have been discovered. If I hadn't gotten more into the iris hybridizing hobby, i'd never had though beyond, ''wow, all of those cool ''mutations'' from one Iris''
Hmm, now another thought... If hybridizing tetraploids and diploids has created many of the newer varities, doesn't backcrossing older (or any for that matter) tetraploids to newer tetraploids have a chance of bringing out the diploid gene pool of one's ancestor, is that why some of the offspring end up sterile because they end up being triploids? I'm a bit lost when it comes to genetics. I understand a bit about color inheritance and things, but haven't ever dove deep into the genetics thing.
thanks for all the help...
steve mahlberg zone 4b NE Minnesota
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 tesilvers <tesilvers@yahoo.com> wrote:Steve / Margie wrote:

"I for one [or should I say two], am a true believer that there are 
some hidden/undiscovered traits/genes in the older varieties - just 
waiting for someone to find them. You are wise to find out all you 
can, but also.... don't be afraid to jump in and have some fun. 
You'll love the excitement with each and every seedling that 
blooms."  


I'm glad to see I've got some company out there; I agree whole-
heartedly.
Here's the same thought I expressed a while ago...

"From what I've seen of the 24-chromosome (diploid) bearded species, 
I don't think we've even "scratched the surface", as far as genetic 
potential goes. I think inbreeding of diploid bearded species crosses 
would turn out some novel interesting combinations of recessive 
genes. I think there probably are many recessive genes that have 
remained hidden by the self-incompatibility of irises (which 
discourages inbreeding) and by breeding primarily at the tetraploid 
level. Also, the foundation of the modern TB's seems to me to be 
primarily based on pallida, variegata and a few middle eastern 
tetraploids. Look what interesting genes have come from infusion of 
dominant genes from other species, for example: pigment darkening 
genes from aphylla, and amoena pattern genes from balkana or 
reichenbachiana. From the diverse bearded species, we could probably 
make use of many more interesting genes, dominant and recessive."

And if I could only find that website I'm thinking of, that had an 
explanation of what ratios to expect from tetraploid crosses (taking 
into account crossing over and quadrivalent formation). It showed how 
much more difficult it is to recover recessive phenotypes at the 
tetraploid level than at the diploid level. So, let's all do like you 
said and "jump in and have some fun". 

P.S. Don't forget about the bearded species

Good luck, Tom
  


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