Re: Re: HYB: REB: Genetics of rebloom
iris@hort.net
  • Subject: Re: Re: HYB: REB: Genetics of rebloom
  • From: C* C* <i*@aim.com>
  • Date: Mon, 14 Mar 2011 12:13:03 -0400
 I expect there to be differences in bud set temperatures. I have seen
indications of that. But for a more detailed examination of this we'll proably
need controlled  temperature conditions such as in a growth chamber.

Thanks for your observations re heat dormancy. Helpful  to have these field
obaservations from climates differernt then mine.

Chuck Chapman



Linda Mann east TN USA zone 7










---- Original Message ----
From: Linda Mann <lmann@lock-net.com>
To: iris@hort.net
Sent: Mon, Mar 14, 2011 8:40 am
Subject: [iris] Re: HYB: REB: Genetics of rebloom


Nuts.  I spent some time yesterday trying to count leaf scars & blades to get
an estimate of relative leaf count on some seedlings and I can't do it.
Because most of my crosses keep living mother, grandmother, and often great
grandmother rhizomes alive and functioning, I can't always tell where one year
stops and the next starts.

So I got estimates from 25 to 50 leaf blades and scars/rhizome :-(  Wild guess
is that these were all close to 12 in reality.  I.e., I didn't see much
difference in the batch of seedlings I was looking at - HoM X PINK QUARTZ.

Probably the only practical way I'm going to be able to try what you suggest,
Chuck, is by lining out some of the seedlings that have potential where I can
just <look> at them during breeding season and be able to tell at a glance
which ones are producing stalks on fans with fewer leaf blades.  Not sure I'm
physically up to that much digging anymore.  Will try to do some between now
and the end of the month, for experiment.  At least I'm pretty much caught up
on lining out this winter's seedlings.

Sorting out the t bearded ones from the HoM X pink kids is a high priority
now, so will work at it.

Thanks for the extract, Chuck.  Time will tell on the CA crosses.  Some of
them are really strong here.

I'm convinced that there are different temperature thresholds for shutdown in
growth - the CA genes do seem to keep things growing thru the heat & drought
here, while the Zurbrigg/G.P. Brown genes often drop foliage.  ENGLISH
COTTAGE, for example, went totally bald and dead looking last summer during
the heat and drought, while most of the Zurb X CA/Oz/OR seedlings kept
growing.  But it might be root system instead of temp.  Or a combination.  EC
is growing like mad now, so apparently no damage was done.

So why not different temp thresholds for bud initiation?  Balkan species vs
Mediterranean.

Linda Mann east TN USA zone 7

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