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RE: HYB: rebloom genetics
iris@hort.net
  • Subject: RE: HYB: rebloom genetics
  • From: Chuck Chapman <irischapman@aim.com>
  • Date: Fri, 14 Jan 2011 14:21:09 -0500

 I ws reading in a book last night "Manipulation of Flowering" by JG Atherton
1987. While this book is out of date, it does have a lot of interesting
information on flowering timing.

Out of date, as flowering triggers are now? being investigated as part of the
MADS-box gene set.? Look it up, on internet for more? details.

But something that caught my eye, was? several formulas designed to predict
flowering , based on several plant values.? These fomulas seem to be needed to
be changed for each crop. And then tweeked for each cultivar.

Here is a quote? that may be of help to those looking for predictions.

" Models which seek to to correlate dates of flowering (or days to flowering)
with various states of environmental factors such as temperature or
photoperiod using formal statistical procedures seem, inevitably, destined
towards increasing complexity; these models can become so bulky and unwieldy
that, ultimately, they suffer? the same fate as the dinosaurs."

So it can be done,? but is complicated.

Linda, in regards to rebloom? I should have mentioned, that of course plants
need to be capable of growing, in order to respond to enviromental triggers.
So if they are in heat or drought dormancy, there will be no reponse to? bud
set triggers.

We did go throught temperature evaluations for your placed based on one of the
nearby weather stations. But a set of records from your own garden will be
best data to use.

If anyone notes a cultivar that rebloms more consistently, or significantly
earlier then others? in any particular year, make note of it. It should have
modifier genes? to enable earlier? bud set.? And thus better rebloom, if we
can capture and pass on thes modifier genes.

To determine cultivar flowering following? maturity and bud set temperatures,
may be possible. And may not be that dificult.?? Fomula would involve?
photoperiod experienced,? (sunrise to sunset) mean temerature for the day,
and? several cultivar variables, reflecting growth? rate.? All would be based
on plant being in appropriate growing conditions.

Chuck Chapman







-----Original Message-----
From: Linda Mann &lt;lmann@lock-net.com&gt;
To: iris@hort.net
Sent: Fri, Jan 14, 2011 9:46 am
Subject: [iris] RE: HYB: rebloom genetics

   Definitely, but sometimes it helps creative thinking (i.e, outside the
box/out in left field ;-) )when 'stuck' while trying to figure something  out.
And sometimes the non-linear wild ideas help clarify the linear.?
?
 Probably not this time, but still interesting - thanks for the black  fish
stories.?
?
 Of course, I immediately wondered about examples of
vernalization/stratification for bloom - horses and daylength for winter  coat
growth trigger.  Talk about a lethal mutation in cold climates that  would be
a benefit in year round warm climates.?
?
 &gt; It is very difficult to take lessons learned in animal genetics and?
 &gt; apply them to iris genetics and it is the same going the other way.
Steve?
?
 Linda Mann east TN USA zone 7?
?
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