Re: Re: rebloom Auto-tetraploid versus amphidiploid was Hyb spots
iris@hort.net
  • Subject: Re: Re: rebloom Auto-tetraploid versus amphidiploid was Hyb spots
  • From: L* M* <l*@lock-net.com>
  • Date: Wed, 13 Mar 2013 08:50:42 -0400
I went back and re-read the chapters on rebloom in TWOI. It says G.P. Brown's foundation line came from one of his own reblooming diploids (variegata? something else?) crossed with Autumn King (n=46). which was then crossed with AUTUMN ELF, which is in the 1939 checklist as an IB GERTRUDE X GRACCHUS?. Both of which are listed as TBs. 

Wish I knew what to make of that.
TWOI goes on to say that this 'tetraploid' was then crossed with AMBROSIA to produce SEPTEMBER SPARKLER, which is in the background of nearly all of G.P. Brown's subsequent rebloomers, including IMM via ENGLISH COTTAGE from AUTUMN SENSATION, which comes from both FALL FAIRY and GREEN DRAGON, both of which have SEPT SPARKLER as grandparents.
TWOI also talks about R. Smith's early rebloom breeding attempts and that he was specifically looking for fertile IBs - the writeup is a bit confusing. It says he was looking for fertile IBs, but then went back and tested some older ?IB's? and found several that were fertile tetraploids.? I guess that means they were fertile in crosses with tetraploids.
There were also a lot of earlier rebloom crosses with chamaeirises - I <thinK> TWOI says none of those are in current bloodlines, but am not sure about that either. Abandoned by the people who were working on them at the time, but no idea if these were among those that Brown or Smith tried to work with later.
I'm sure this has been written about in more detail in subsequent rebloom recorders or the Bulletin - can anyone point me to a more recent writeup?
Just wondering how much amphidiploidy might be affecting the various types of rebloom inheritance, might help? explain why some types of rebloom x rebloom crosses don't work as well as others. i.e., harder for the other genes needed for rebloom (not just the 4 types of triggers Chuck has talked about) to match up right. 

Linda Mann

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