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Re: Re: HYB: rebloom genetics
  • Subject: Re: Re: HYB: rebloom genetics
  • From: Chuck Chapman <irischapman@aim.com>
  • Date: Mon, 10 Jan 2011 09:10:45 -0500

 See my earlier post for some of this answer.

Multiple dosages of the non-vernalisation gene? (coupled with appropriate
other genes needed for FC rebloom)? will not change anything in terms of
timing of bloom. It is an off switch (need for vernalization is turned off)?
It doesn't matter how often it is turned off. Off is off. But will make a
difference in number of reblooming? seedlings you will get? when using it as?
a parent.

The secondary factors are what? affect degree and earliness of rebloom.

Major factors will be
1) number of leaves at maturity needed for? bloom. the smaller this number,
the sooner a plant is mature and ready for rebloom trigger.
2) plant vigour.
3) speed of growth, which may be a separate factor from vigour.
4) Ability to use resources available to plant. that is needs less? resources,
such as soil nutrients, water, sunshine , warmth, etc. This is where a
stronger more efficient root system comes in
5) actually? temperature needs for bud set trigger.? If it sets with fewer
days or at a wider temperature range, it? will rebloom sooner and more often.
6) photoperiod? trigger for bloom. Or? time needed at maturity level before
rebloom (not sure which is trigger here)

Thus? the best parents to use with FC? plant for good rebloom in seedlings is
not necessarily another FC rebloomer, but one with? very good secondary
factors. As it is these factors added to? the non-vernalization gene? that
give you the earlier rebloom.

For instance, Rossalie Figge is a good steady rebloomer, but often reblooms?
late and is caught in freezes. It has a mature leaf count of 13, which is a
bit high And seems to be a bit slow to mature. But October Splendor has 16 .
Probably why I didn't get any rebloomers from a cross of October Splendor X
Lenora Pearl. The seedlings all had too high a mature? leaf count trigger.

Chuck Chapman

-----Original Message-----
From: Linda Mann &lt;lmann@lock-net.com&gt;
To: iris@hort.net
Sent: Mon, Jan 10, 2011 7:45 am
Subject: [iris] Re: HYB: rebloom genetics

   Wandering way outside the box here, Chuck, can you think of a mechanism
where multiple doses of cycle genes would affect timing of bloom?  Ignoring
the simplest explanations, just wondering.?
 I.e., double or triple or quadruple dose of late fall cycle genes would
cause earlier fall rebloom??
 I guess a more plausible scenario would be the effect of multiple doses  of
the other factors (i.e., those affect growth rate to maturity) that  might be
associated with cycle genes.?
 Linda Mann east TN USA zone 7?
 &lt;lots&gt; of snow this morning.?
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