Re: HYB: pairing of TB and pumila chromosomes
iris@hort.net
  • Subject: Re: HYB: pairing of TB and pumila chromosomes
  • From: &* W* <i*@telp.com>
  • Date: Sat, 2 Mar 2013 08:30:38 -0700
Linda,
I tend to agree with Chuck that if it were possible to pass the pumila spot 
on to the TBs, it would have happened already. The implication is that the 
spot pattern gene is on a pumila chromosome that never pairs with any TB 
chromosome.
Tom


   

Tom Waters   


Telperion Oasis ~ www.telp.com/irises    


Cuyamungue, New Mexico, USA (zone 6)  

----------------------------------------
From: "Linda Mann" <lmann@lock-net.com>
Sent: Saturday, March 02, 2013 5:40 AM
To: iris@hort.net
Subject: Re: [iris] HYB: pairing of TB and pumila chromosomes 

Thanks for digging this quote out, Tom.  This is the concept I was 
vaguely remembering, from discussions 10+ yrs ago here with Sharon and 
you, which is what prompted her sending me the article.  Which I really 
will find in this house one of these days!

It's why I was wondering if there might be homologous opportunities 
amongst some spotted pumila and some TBs that haven't been found, yet. 
Sounds like, theoretically, there are still some possibilities there. 
Definitely not something I'm going to pursue at this late stage of my 
life!

On 3/1/2013 6:26 PM, Tom Waters wrote:
>>From_The World of Irises_, page 176:
> "Cytological studies in plants of 36 (12 8 / 8 8) and 44 (12 12 / 12 8)
> chromosomes (Randolph and Heinig 1953) showed that in addition to the
> pairing of two of the matching sets, chromosomes of the odd sets of 8 
and
> 12 chromosomes often formed four additional pairs, indicating that four
> chromosomes in each set were enough alike to pair in the absence of more
> homologous partners."
> I think this accounts for some IBs being more fertile than one would
> expect.

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