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Re: Re: CULT: Rebloom temperature
  • Subject: Re: Re: CULT: Rebloom temperature
  • From: Chuck Chapman <irischapman@aim.com>
  • Date: Sat, 28 May 2011 07:23:53 -0400

 I'm guessing at 5 months based on observation. Basically it would seem to be
three months of growing season after bud set and two months of winter (as
expected by plant genetics).

"Lateral Clines" is a biological term used to describe how a plant adapts to
the latitude it has evolved in. An adjustment of growth, hibernation and bloom
time signals, that adapts it to its weather and sunshine conditions. When
plant is moved from latitude it has adapted to, to another latitude, then
signals no longer match plants genetic signals and things go awry. Thus plants
adapted to Mediterranean region would expect (guessing at this timing) three
months following bud set. First increases need to reach maturity, then bud set
temperature, then the three months before winter. Then two months of winter.
So either there is enough cold during winter to vernalize plant or prime for
flower stalk growth, or using back up system of time, to account for a mild
winter not cold enough to set cold vernalization.

So when plant is moved to a region where there is five months of growing
season after budset, it's biological triggers tell it it is now spring, and it
reacts accordingly.

At least the way I'm conceptualizing this at this time.

Chuck Chapman

---- Original Message ----
From: Linda Mann <lmann@lock-net.com>
To: iris@hort.net
Sent: Sat, May 28, 2011 6:01 am
Subject: [iris] Re: CULT: Rebloom temperature

Yes, that does help Chuck.  I am still a little confused by the concept that a
plant is "mature" at some point, then continues growing for 5 months, but I
understand what you are saying.  That the increases grow while the main fan
waits.  It would still result in a lot of foliage with few stalks.  Is that
what summer bloom in CA looks like?

Why 5 months, rather than 2 or 6 or ?  What determines the amount of time?  &
is it affected by temp, light etc?

With the long growing season here, if I can combine the genes that are giving
me seedlings capable of thriving in my growing conditions with the CA
preferential vernalization genes, with a higher temperature threshold for
stopping growth, that should (potentially) give me some late summer bloom.

Mike, the reason I'm interested in your August bloomers is that according to
the temperatures (comparing your nearest urban heat island with my nearest
urban heat island), rebloom you might get in August will be occurring with
stalks starting to develop in July, during the hottest part of your growing
season, comparable to our normal temperatures all summer.  Assuming it takes
about 6 weeks to go from start to open blooms.

If Chuck's concept is correct (and I have no reason to think it isn't), then
it won't really matter which month you are seeing rebloom except that those
that can bloom in Aug would hopefully be the most heat tolerant. It's that
heat tolerance/ability to produce bloom plus modern form gene suite that I'm
looking for.  IMM can provide the disease tolerance. Maybe. ;-)

Linda Mann east TN USA zone 7

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