Re: Re: REB: Genetics of rebloom
iris@hort.net
  • Subject: Re: Re: REB: Genetics of rebloom
  • From: &* S* <i*@suttoniris.com>
  • Date: Mon, 21 Mar 2011 07:57:35 -0700
just a small note, we are five miles west of porterville in the country and get much colder with many more days of sub freezing weather than in the town itself. The city of Porterville's official flower is the iris and we have supplied them with thousands of rebloomers. the downtown area has bloom year-round and their spring peak bloom is nearly a month ahead of ours. Interestingly the iris in planters under the street lights bloom more profusely year round if they are rebloomers and have an even earlier peak spring bloom. (bout a week earlier) checked to see if it was a heat issue but there is no difference in the ground level temps under the street lights as opposed to the iris not planted near the lights, so it is more than likely a light issue. The first freeze at our gardens is typically mid to late Oct. with the last freeze in late Feburary - early March (but of course we have had frosts through April in the past). We usually experience our first tall bearded rebloom in early June, about six weeks after peak spring bloom. Spring peak has been getting latter for the past decade, up to about the 22 - 25th of April. When we first moved the gardens here in 1988, peak was tax day (April 15th). This year looks like an extremely late bloom year. Don't know if that helps your research but thought it might be useful information. 
Mike Sutton
----- Original Message ----- From: "Chuck Chapman" <irischapman@aim.com> 
To: <iris@hort.net>
Sent: Monday, March 21, 2011 5:14 AM
Subject: Re: [iris] Re: REB: Genetics of rebloom



In terms of the rebloom trigger, the California Rebloomers (CR) has the
latest season trigger. Much later then Fall Cyclic. So much work is needed to? bring this into play? earlier in season. So carefull selection is needed? in order to select? the ones with less then 4-5 months of growing season, after 
bud initiation.

The second selection process is? select those that can carry a flower
initiation over winter undamaged, so they can have extra early and extended 
bloom in spring. This works well in Ca and Oz, but may not work as well in
areas that get colder winters.
The third factor is in having a moderate growing season, so flower buds can be initiated early and often, and plants can continue to grow, not be in climate 
induced drought and heat dormancy.

I checked weather in Portervile Ca. In 2010? there were only 5 days? of
freezing weather, (30F)? and? June, July, Aug, Sept and Oct all had? bud set 
temperatures.

In OZ, Barry Blyth reports 80-90% of all cultivars have rebloom.
When we compared super hardy plants from your climate and my climate, we found the same plants were in both of our super hardy group, were we grew the same 
plants.

When you have a super growing environment, and plants have adequate water,
then I suspect? that you can have such fast growth of increases? that they can bypass the reset signal from main fan. When you don't have thes conditions, 
you don't get this phenomenon.
Combining the differernt rebloom genes in the same plant doesn't? produce any 
increase in rebloom. Still only one flowering per fan. Earliest trigger is
what starts the flower initiation.
For? extended season bloom, we need early rebloom trigger and fast growth and 
multiple increases.

Chuck Chapman





---- Original Message ----
From: Linda Mann &lt;lmann@lock-net.com&gt;
To: iris@hort.net
Sent: Sun, Mar 20, 2011 9:52 pm
Subject: [iris] Re: REB: Genetics of rebloom

  Time will tell.?
?
You are in so much colder climate than here, I can see you wouldn't see much good coming from CA/OZ selections, rebloom or not. CA/OZ are both close to 
my climate temperature zone, so weakness here is more from  intolerance to
erratic rain, high humidity, and some years, severely erratic winter. But 
like selections in any climate, there are some with  more potential than
others.  Figuring out which ones will work here the  big challenge.?
?
& if CA/Oz summer rebloom requires a long growing season, that's a good
thing here.  & if you are right that it is one or more dominant traits,
that's even better.?
?
But I can see that's not going to work for you.?
?
I hope I can get some plants to cooperate this year to try a few more IMM X 
(IMM x XYZ) mixes. XYZ being west coast or Oz selections.?
?
Chuck Chapman in Canada said:?
&lt;I don't see Cal rebloomers adding anything to mix that a good (cold or? 
otherwise)?
hardy plant with branching? and bud count PLUS? hardiness couldn't add to?
mix.?
Without bringing in the? weakness a number of these California plants have. 
&gt;?
?
Linda Mann east TN zone 7?
?
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