Re: Re: HYB: REB: Genetics of rebloom
iris@hort.net
  • Subject: Re: Re: HYB: REB: Genetics of rebloom
  • From: B* W* <a*@aol.com>
  • Date: Mon, 14 Mar 2011 10:05:01 -0400 (EDT)
In my garden this is a protective mechanism.   It helps them survive.  In 2007
so many seedlings dropped their fans that I thought I'd lost entire crosses.
Intoductions for other places did too, but I was mainly concerned with the
seedlings!   It took them quite some time to recover, but most did.


<<ENGLISH COTTAGE, for example, went totally bald and dead
ooking last summer during the heat and drought,>>


Betty W.




-----Original Message-----
From: Linda Mann <lmann@lock-net.com>
To: iris <iris@hort.net>
Sent: Mon, Mar 14, 2011 7:48 am
Subject: [iris] Re: HYB: REB: Genetics of rebloom


Nuts.  I spent some time yesterday trying to count leaf scars & blades
o get an estimate of relative leaf count on some seedlings and I can't
o it.  Because most of my crosses keep living mother, grandmother, and
ften great grandmother rhizomes alive and functioning, I can't always
ell where one year stops and the next starts.
So I got estimates from 25 to 50 leaf blades and scars/rhizome :-(  Wild
uess is that these were all close to 12 in reality.  I.e., I didn't see
uch difference in the batch of seedlings I was looking at - HoM X PINK
UARTZ.
Probably the only practical way I'm going to be able to try what you
uggest, Chuck, is by lining out some of the seedlings that have
otential where I can just <look> at them during breeding season and be
ble to tell at a glance which ones are producing stalks on fans with
ewer leaf blades.  Not sure I'm physically up to that much digging
nymore.  Will try to do some between now and the end of the month, for
xperiment.  At least I'm pretty much caught up on lining out this
inter's seedlings.
Sorting out the t bearded ones from the HoM X pink kids is a high
riority now, so will work at it.
Thanks for the extract, Chuck.  Time will tell on the CA crosses.  Some
f them are really strong here.
I'm convinced that there are different temperature thresholds for
hutdown in growth - the CA genes do seem to keep things growing thru
he heat & drought here, while the Zurbrigg/G.P. Brown genes often drop
oliage.  ENGLISH COTTAGE, for example, went totally bald and dead
ooking last summer during the heat and drought, while most of the Zurb
 CA/Oz/OR seedlings kept growing.  But it might be root system instead
f temp.  Or a combination.  EC is growing like mad now, so apparently
o damage was done.
So why not different temp thresholds for bud initiation?  Balkan species
s Mediterranean.
Linda Mann east TN USA zone 7
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