Re: HYB: pairing of TB and pumila chromosomes
iris@hort.net
  • Subject: Re: HYB: pairing of TB and pumila chromosomes
  • From: L* M* <l*@lock-net.com>
  • Date: Sat, 02 Mar 2013 07:39:13 -0500
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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