Re: iris DIGEST V1 #954

<<They seem to set flower bud
as soon as plant reaches maturity>>

First, I'm not sure Arctic Fox is a oncer only.  I've some faint memory of
seeing it in a rebloom report, but I can't locate the report so I've no
support material.  What are the conditions of the test?  Are they in a grow
chamber as you've suggested in the past?

<<For Direct, or summer rebloomers, they go directly from flower bud set to
bloom. No further trigggers needed.>>

To summarize for non-scientist types: all types of rebloomers can set bloom at
any time from early spring to last freeze, and even in the winter if the
weather is warm enough.  Time of bloom (potential) then depends on the
particular gene (or perhaps a damaged gene) in the cultivar.  The damaged gene
theory entrigues me.  Modifiers and triggers have no influence on type of
rebloomer.

My confusion comes in trying to understand what you see as the difference
between Summer/Direct bloom and "Whenever" rebloomers.  I do understand your
definition of Direct/Summer rebloom.  This is what I thought I knew to be
"Whenevers."  I'm not understanding how they are different from the
"Whenevers."  What did I miss?

<<'Whenever' rebloomers don't seem to need the warm period to have flower bud
set. They seem to set flower bud  as soon as plant reaches maturity.>>

This would explain the vast number of Immortality fans (Lunar Whitewash, too)
that do not bloom at all--plentiful growth that is too slow at some point.
Better soil or more fertilizer might help.  Around here, Immortality doesn't
like to bloom on first year fans.  By the time it has settled in, the soil has
lost that virgin soil fertility (+additives) and needs additional fertilizer,
but the clump becomes packed with smaller rhizomes thus choking itself.  There
are ways to trick it, but it takes extra work.  Wish I were young enough and
strong enough to double dig a few beds.

<<<Vernalization is carried forward in increases by fast growth on the
increases bypassing
normal vernalization reset from apical dominance. Thus if the increases grow
too slow in spring, they will have vernaliation state reset,>>

You are saying that vernalization is "passed on" to increases?  That they do
not have to go through winter themselves?  (This was in the whenever
paragraph.)

In addition--do you think the Direct/Summer rebloomers would bloom in those
climates that have no winter, since they do not require vernalization?

Thanks again,

Betty Wilkerson
Bridge In Time Irises
KY Zone 6.


-----Original Message-----
From: irischapman@aim.com
To: iris@hort.net
Sent: Tue, Nov 10, 2009 12:44 pm
Subject: Re: [iris] iris DIGEST V1 #954



Artic Fox is a oncer, being used  as control for Immotality.  Richard is
ooking first at what sets flower bud.
 For regular oncers, the proceedure is a follows
1) plant reaches maturity
) Temperature triggers flower bud set. For most cultivars, TBs that is, it
ould seem to be 6 days
with night time temperatures min between 16 and 21C. Plant waits in readyness
tate for further development until
urther conditions are met. Now the flowers are primmed, but not triggered.
) Vernalization, cold period during winter
) growth conditions in spring, warmth, moisture and warm enought to grow
) Long night periods to act as photoperiod trigger.
For Direct, or summer rebloomers, they go directly from flower bud set to
loom. No further trigggers needed.
owing directly from initial trigger to bloom , this seems to be about 3 weeks
n cold climate and proabably about 2 weeks
n warm climate.
For fall cyclic rebloomers, they sit and wait until nights are long enough to
rigger bloom. they don't need
ernalization.
'Whenever' rebloomers don't seem to need the warm period to have flower bud
et. They seem to set flower bud
as soon as plant reaches maturity. Vernalization is carried forward in
ncreases by fast growth on the  increases bypassing
ormal vernalization reset from apical dominance. Thus if the increases grow
oo slow in spring, they will have vernaliation state reset,
nd will not be able to "whenever" rebloom
Chuck Chapman
Date: Mon, 09 Nov 2009 16:27:05 -0500
rom: autmirislvr@aol.com
ubject: Re: [iris] iris DIGEST V1 #953
Chuck, Just so I understand what I'm supposed to understand--
It's my understanding that bloom is set after spring bloom,  then stalks are
initiated" later, when the conditions are right?  Whatever the process that
auses "initiation" would depend on temperature and/or other conditions like
oil composition & moisture?  Soil composition & moisture being two key
omponents in rhizome growth?

<hot at nifght to get flower bud
t temperature,>>
Do you have an estimation on the average time elapse between "initiation" and
pen bloom?  It would vary depending on temperatures?  Just as spring stalks
o?
My goal is to heavily incorporate irises that bloom here in the summer in
opes of creating more irises that bloom well in advance of our fall frosts.
've already incorporated a number of "sporadic" rebloomers.  I am getting
hings that rebloom, sometimes in the first generation.  It's always a
hrill.
Betty Wilkerson
ridge In Time Irises
Y Zone 6





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