Re: Re: HYB: rebloom breeding
iris@hort.net
  • Subject: Re: Re: HYB: rebloom breeding
  • From: C* C* <d*@rewrite.hort.net>
  • Date: Tue, 2 Dec 2014 12:27:04 -0500
If you read my article and look at pictures it will be much clearer.
At maturity, plant stops growing and just sits there. Leaves may become larger, but no new leaves. No further leaves or any growth of increases until bud set.
It takes about 2-3 weeks for flower after start of flower stalk growth.
Plants have an elaborate way of measuring time. Several complex interacting systems. For more information on this you need to look into the molecular signalling in plants. Focus on vernalization and flowering systems. A couple of useful books are "Flowering and it's manipulation" and "Molecular biology and biotechnology of flowering" Editor Raven
Remember oncers (obligate vernalization) don't bloom until they get vernalization. Like bearded iris that survive in zone 10. They grow for ever but never bloom. 

Chuck Chapman

-----Original Message-----
From: Linda Mann <101l@rewrite.hort.net>
To: iris <iris@hort.net>
Sent: Tue, Dec 2, 2014 11:11 am
Subject: Re: [iris] Re:  HYB: rebloom breeding

Thanks for providing the comparison for me, Chuck.  I don't know if I'm
ever going to get this straight.
Could you explain a bit more what you mean by "maturity" vs "growing for 
an additional 5 months"?  I'm confused about what you mean by a plant
being mature if it has to grow for another 5 months.  It takes ~6 weeks
for a stalk to develop, if I remember correctly, so I see that's 1 1/2
months of the 5, but what kind of growing is the fan doing other than
that, once it is mature?

Producing increases?  Growing roots? Fattening up the rhizome?  Seems
like once it's "mature" and has bud set, it ought to be able to bloom in 
less than 2 months, not 5.  Does the 5 allow for intermittent dormancy?

What am I missing?  It sounds like Margie's rebloomers are having
something closer to the 6 week turnaround (repeat bloom).

Also, if that's correct, then that would mean none of the rebloom I see
is CA/OZ type, which means it's all either summer or fall cycle.  And
anything that blooms in July, Aug or Sept is either summer or has very
high temperature thresholds for bud set and dormancy.  The ones that
bloom in July & Aug for zones north of here but not ever before Sept
here presumably would have lower temperature thresholds for one or the
other.

I can work with that theory.  Just having to figure out whether rebloom
is one or the other is certainly easier than sorting out 3 different
possibilities.

On 12/1/2014 7:52 PM, Chuck Chapman wrote:

Spring bloom,  then 2 months for  plants to mature, bud set and then
five months of growth. So  beginning of May bloom, so maturity of
increases  beginning of July . If get bud set temperature right away,
then five months later would be January, with good growing weather 
and

no frost.
In California flowering in March. Maturity of increases in May 
Five

months later is November.


Linda Mann

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