Re: Re: REB: Genetics of rebloom
iris@hort.net
  • Subject: Re: Re: REB: Genetics of rebloom
  • From: C* C* <i*@aim.com>
  • Date: Mon, 21 Mar 2011 08:14:57 -0400
 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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