Re: HYB: REB: Genetics

One of the problems is knowing exactly what you have. So many of the rebloomers have been crossed cyclic to summer rebloomers, so that it is a sheer guess as t owhat they have as genetics. The summer and cyclic rebloomers do seem to have different genetics.
when choosing sibs to cross, take the earliest bloomers and the most vigouroi=us growers.
When I'm, choosing the seedlings to keep from my Forever Blue lines, I keep the seedlings with the most floewr stalks and the earliest bloomers, od course colour plays a choice. Then I keep the culls until seasons end before discarding in case any show rebllom.
Always grow as many seedlings as you can. 1/36 is the expected ratio of recovering a recessive from a rexessive x other plant F2. 

Chuck Chapman

Date: Sat, 31 May 2008 08:21:03 -0400
From: Linda Mann <lmann@lock-net.com>
Subject: [iris] Re: HYB: REB: Genetics

Chuck, I'd really like to be able to use some of my non-reblooming
children from rebloom parents (IMM, HoM, TEA LEAVES, VIOLET MIRACLE,
RENOWN).
Even just using cycle and summer rebloom as variables, I'm struggling to 
come up with a hypothesis that eXplains what I'm getting so far re:
probabilities of rebloom.

If cycle and summer are dosage effects from the same set of allele or
additive effects from two different sets of alleles, or (worst yet) are
inherited and act completely independently, and are recessive, it looks
like the probability of getting rebloom from non-reblooming half sibs
from rebloom parents would be very small.  But not so small as not to
try. I.e., if it's 1 in 36, for me, that's worth trying.

But if one (or both, if there are two different sets of alleles?) is
dominant, then I won't ever get rebloom that way.

Oh rats, my brain just scrambled - can't quite see how a recessive
rebloom allele might interact with a dominant one, especially if they
both have dosage effects from other alleles related to eXpression of
rebloom.
Anyway, I need help figuring out how many seedlings I might have to grow 
from that type of cross in order to get any rebloom at all or at least
to test some hypotheses. Especially since <eXpression> of rebloom is so 
dependent on weather, even when the genes are there to allow bloom.

- --
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.DiscoverET.org/etis>

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