Re: Re: REB: rebloom seedlings
Progress in good form on rebloomers for cooler climates has not
progressed much, if any since Clarence (Zurbrigg, 1991) . That is 23
years ago. It is still the best formed flower that consistently
reblooms for me. At time it was said "Rebloomers are now come of age" .
Since then on goal for people breeding rebloomers was to get flowers
equal to best of oncers on rebloomers. Two routes were taken.
1) Breed strong cooler climate rebloomers to warm climate rebloomers
with great form.
2) Breed rebloomer s to each other and select best form etc.
Neither of these approaches have worked.
What I'm offering is a reason why they don't work, and an approach that
I strongly feel will give progress. Now that I'm finally getting TB
iris that are super hardy in my very challenging climate I can now work
on reblooming TB iris. I expect that they will never perform up to my
Whenever SDB iris which seem to bloom in all climates, down to zone 2B,
as well as much warmer ones. I haven't found a pathway to bing the
"Whenever" rebloom genes into TB. Stil lworking on it, but suspect that
it just isn't possible.
There is a lot of literature on blooming triggers in the scientific
literature. A very complex dance of genes. Many many different genes
involved. The only one that can produce rebloom only in warm climates
are ones associated with a process called "facilitative vernalization"
A protective measure for warm climate species that enable it to bloom
in spring when it doesn't get winters cold enough to trigger
vernalization genes to provide correct signal. A backup system, so to
speak. So it blooms after a period of growing conditions equivalent to
five months after bud set. Warm climates give a longer growing period
then the Mediterranean species get in native habitat, so thus bloom out
of season. So if an iris only reblooms in zone 8 and 9, as far as I
can see this is the genetics it has.
As this is an ongoing study, learning as I go, I'm always interested in
hearing of something that would suggest that is not so. Then I can
relook at the information and look for other reasons.
From: Linda Mann <email@example.com>
To: iris <firstname.lastname@example.org>
Sent: Mon, Oct 6, 2014 9:36 am
Subject: Re: [iris] Re: REB: rebloom seedlings
Which assumes that is possible/easy. Easy to use the former, but I got
nowhere trying to do the latter <here> because they wouldn't produce
The "most productive choices" needs the caveat of "for your breeding
I don't like your assumption that all 'sporadic/mediterranean
etc' expression of rebloom = proof of the presence of one type of
i.e., my 'bet' is that it isn't always just one type ;-)
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