Re: Re: HYB: question - probability inheritance of rebloom

Linda -- Just chiming in, I'd say your chances of getting any reblooming seedlings from a cross of "non-reblooming step siblings from IMMORTALITY, where both other parents are non rebloomers" is, to use your term, one in a zillion. I'm not sure what a "step sibling" in irises is, but crossing non-reblooming siblings of a rebloomer with non-rebloomers in hopes of getting a rebloomer seems to me like throwing a stone in the ocean and hoping it will hit a fish.
On the other hand, the example that you use (IMMORTALITY x CELEBRATION SONG) X (IMMORTALITY x RING AROUND ROSIE) might very well get you a rebloomer, because all three of the parents are known rebloomers somewhere, and you have two doses of the one known more widely as a rebloomer. Importantly, this is the case even if none of the three rebloom for you. For instance, both my HAUNTING (intr'd 2006)and STEALTH FIGHTER (to be intr'd 2008) are from parents that have never rebloomed for me. HAUNTING is from (HOLY NIGHT x BEST BET) x (HOLY NIGHT x SWEETER THAN WINE). STEALTH FIGHTER is from (TITAN'S GLORY x (HOLY NIGHT x SWEETER THAN WINE)).
I hoped to get a rebloomer from the cross that produced HAUNTING, but, still, it was the only rebloomer among 11 seedlings from that cross. STEALTH FIGHTER was completely unexpected. I suspect that either SWEETER THAN WINE or TITAN'S GLORY, or both, is a carrier of rebloom and that this combined with HOLY NIGHT to produce the rebloom in STEALTH FIGHTER. Both of them appear as parents or grandparents of certain rebloomers. But I didn't know that when I made the cross.
So, my point is that if one is going to expend effort and garden space on going for rebloom, it's better to stack the odds as much as possible in your favor than to spin the wheel and hope it lands on the gold star. -- Griff
----- Original Message ----- From: "Linda Mann" <lmann@lock-net.com> 
To: <iris@hort.net>
Sent: Saturday, October 20, 2007 3:33 PM
Subject: [iris] Re: HYB: question - probability inheritance of rebloom
Thanks Mike. I had been assuming that was the case, but realized I'd never thought to ask (or have forgotten if I did!)
What I'm really wondering is what percentage of rebloom I can hope for crossing (for example) non-reblooming step siblings from IMMORTALITY, where both other parents are non-rebloomers.
Would it be one in four, one in six, one in a zillion (several, one or two, none)?
Assuming there isn't anything in the non-reblooming line to 'block' rebloom.
For example, [to pick a potential real example] what percentage of seedlings might be expected to be rebloomers (here) from a cross like this: (IMMORTALITY x CELEBRATION SONG) X (IMMORTALITY x RING AROUND ROSIE)?
Both CSONG and RAR have been reported to rebloom elsewhere sometimes, but not in my climate.
Only 2 tenths of an inch of rain from that last 'storm', but every drop counts! 
--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>
Region 7, Kentucky-Tennessee <http://www.aisregion7.org>
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