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Re: REB: genetics
  • Subject: Re: REB: genetics
  • From: Chuck Chapman <irischapman@aim.com>
  • Date: Sun, 14 Nov 2010 11:01:53 -0500


Summer rebloomers go straight from bud set to flowering.  No need for daylight triger or vernalization. So whenever a mature plant has bud set temperatures, it initiiates a flower stalk.

If clump did not bloom in spring, then  each increase will initiate a flower stalk when bud set occurs.

Prefernial Vernalization   have bud set, then rest. After a period of time (proabaly abour 3 months) of warm weather, they figure winter was too mild , so it must be spring, and then initiates bloom stalk.

Completely differerent genetics. No chance of inreased of rebloom from crossing these two types.  You will likely get more of genotype Preferntial vernalization, but  no summer rebloomers , unless carried as recessive in  PV

Also of note,  PV rebloomers don't have to  have any need of secondary characteristics needed for the other types of rebloomers. So unless you are working PV for a suitable climate, you are likely taking a step backwards  for  rebloom.

 The best way to distinguish, woulfd be rebloom record, and checking mature stalks versus bud set temperatures.. Then looking at when plant reblooms.

Chuck Chapman

-----Original Message-----
From: Linda Mann <lmann@lock-net.com>
To: iris-photos@yahoogroups.com; iris@hort.net
Sent: Sat, Nov 13, 2010 7:06 pm
Subject: [iris-photos] Re: REB: genetics

I'm having a hard time understanding what traits distinguish
"preferential vernalization"(Oz/CA) rebloomers vs "summer" (i.e., warm
season) rebloomers here, where the growing season can last from Mar thru
Oct. Range of temperatures & duration needed for bud set?

Most of the "summer" bloomers here seem to require a few nights of
relatively low temperature ~6 weeks before bloom, but IMMORTALITY either
doesn't require quite as low temperatures or the secondary (i.e.
growth?) requirements seem to be easier for her to meet. Ditto BELVI
QUEEN. BQ will more or less bloom all summer with enough water and if I
keep the weeds down a bit. Plus it reblooms in the SW - not sure if
that's only with cool weather trigger (i.e., fall/winter).

The year that IMM bloomed 5 different times, more or less one stalk per
month, all stalks came from one clump. Most summers here have many
overnight low temperatures <70o F. That doesn't seem to be low enough
to trigger rebloom for most of the Zurbrigg "summers" here. Seems to
take nights in the 50s. But maybe that's low enough for IMM, with mature

I've been hoping that the summers and the CA/Oz rebloomers have the same
set of genes for rebloom <except> for the temperature limits. Separate
genes? One for temperature to trigger bud set, the other that makes it
possible to trigger bud set without vernalization? Or all one gene? Or
5 or 6 genes to control the whole process of bud set?

If your theory is right, Chuck, that "summers" and Oz/CA rebloomers are
different genes, I'm not going to like that here in the "vale"! Esp if
Oz/CA trait is also recessive. Or worse yet, it's determined by the pod

Linda Mann east TN USA zone 7

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