Re: Re: HYB: REB: Genetics of rebloom (was orange)
iris@hort.net
  • Subject: Re: Re: HYB: REB: Genetics of rebloom (was orange)
  • From: C* C* <i*@aim.com>
  • Date: Sat, 12 Mar 2011 18:59:13 -0500
I didn't mention  the California rebloomers.

But to try and clarify.  There are four different types of rebloom genetics,
as far as I can tell.

The  summer rebloomers and Whenever rebloomers seem to be a recessive gene
combined with at least one dominant gene.

Fall cyili and California rebloomers seem to be a dominant trait. Note I'm not
saying a dominant gene. It is actually a combination of traits, but end result
is treat as a dominant.

The temperature trigger for bud set  is same for  FC, Summer and  Cal
rebloomers. Whenever rebloomers are different in this characteristic.

While I had  originally thought  that FC rebloomers were responding to a
daylight trigger, I'm reconsidering this  in light of new data. I suspect a
time at maturity  with bud set to be the trigger.  Similar in some respects to
Cal rebloomers. Still need to figure out differences. But Cal rebloomers need
much more time as a mature plant. Live and learn.

Plants have clocks and calenders, but not sure how they use them. But clocks
do stop working when plant is in drought or heat dormancy

All rebloomers  can carry a primed rhizome over winter. This is easier and
more likely in warmer climates. So  they can then have out of season bloom,
with carry over from increases on primed  rhizomes. The increases in these
cases don't get reset.

Normally a  plant will reset  vernalization condition  in the increases by
the blooming. But off season set coupled with  wintering over seems to
prevents (or interfere with) this reset. Part of this could be that increase
are too large by time main fan blooms, so reset doean't work.

I'm beginning to suspect that  we could  bring rebloom from Ca rebloomers
earlier into season by selection.  But not likely able to increase plant
hardiness unless these are trialed and selected in  more adverse climates.


Chuck Chapman











---- Original Message ----
From: Linda Mann <lmann@lock-net.com>
To: iris@hort.net
Sent: Sat, Mar 12, 2011 8:59 am
Subject: [iris] Re: HYB: REB: Genetics of rebloom (was orange)


I'm a little confused by this, Chuck.  I understand what you are saying about
leaf count, vigor etc, but this (combined with your earlier posts) sounds as
if you are saying there are two different sets of genetics controlling rebloom
(summer & cycle, the former recessive, the latter dominant), but the
expression of rebloom (phenotype) is the same?

So there could be June & August (usually too hot in July here for the lines of
irises that thrive in my growing conditions) bloom from either, if growing
season is long enough and temperatures suitable?  So in a very mild winter,
followed by warm spring, and cool summer, the cycles could also bloom in
summer?  So change in daylength isn't a factor in cycle rebloom?

If that's what you are saying, I don't believe it.  But that's just my gut
reaction, no data.

I can see that would apply to "CA" rebloomers, & if that's also dominant,
that's definitely something I'd enjoy having here.  Some lines not as
sensitive to heat inhibiting bloom as some of the really healthy growers here.

Or is that what you are thinking re: cycle rebloomers, that they are actually
the same as CA, but with different temperature limitations? More tolerant to
heat, less to erratic cold.

Thought provoking ;-)

<By selecting  the most vigourous growers and ones with lowest mature leaf
count, you move  bloom time forward.

The weather conditions that set flower buds is the same for summer rebloom and
Fall cyclic.

The weather conditions that inhibit  rebloom is the same for both.

So if a plant matures fast enought to get bud set before  too warm weather
sets in, you will get  early fall cylcic rebloom.  Same with summer
rebloomers.>

Linda Mann east TN USA zone 7

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