The "Idea" that  these "Preferential Reboomers" will aid  and advance  
reblooming breeding  has been around for some time and many people have 
  tried it.  So where are the results?  And any  evidence that it has 
advanced   the  Rebloom genetics? Basically it weakens the   hardiness  
of the seedlings.

If you want me to reply to  question of  Byers rebloomers, then  give 
me a specific one to address. One where he crossed a normal  cold 
climate rebloomer  to a Preferential vernalization and got an 
advancement  in a cold climate rebloomer.

Crossing  good hardy  oncers with  low mature bud count and early bud 
set (for climate they are grown in) is the way to advancement.

Chuck Chapman



-----Original Message-----
From: Linda Mann <1*@rewrite.hort.net>
To: iris <i*@hort.net>
Sent: Wed, Nov 26, 2014 9:50 am
Subject: Re: [iris] REB: HYB: rebloom breeding

Whether using those wimpy (ummm, 'unsuitable') irises in our more
difficult growing conditions adds anything or not, that wasn't my
question.

You have said several times that "those" crosses have been repeatedly
tried with no success.  What was crossed and what kind of climate?  I'm
just curious to know more about what breeding experiments of others led
you to say it doesn't work?

And what about the Byers rebloomers?

My developing theory is that some (who knows which ones) of those dry
climate zone 8 & 9 rebloomers have genes that are appropriate early?
rebloom genes for colder and/or wetter climates, but just aren't
combined/selected for tolerating the other stresses that are present in
colder/hot-wet.  In other words, some of them (may) have the right
rebloom genetics, but don't thrive outside of their home selection
conditions.

It would explain the Byers rebloomers and some others.

As for adding anything, if some of these dry climate zone 8/9 
rebloomers
carry summer rebloom genes <plus> modern form, it seems like that
definitely would be a useful addition to what's currently available.

i.e., Tea Leaves mixed with Treasured and Imm.

So few reliable & strong summer bloomers this far southeast to work
with, any additional new 'blood' seems like it would be helpful.

Some crosses of dry summer zone 8/9 sporadic rebloomers produce plenty
of healthy first generation seedlings here, and even the really weak
ones usually produce a few decent survivors, if I get enough seeds.
Crossing those back onto something more adapted usually gives a very
high percentage of healthy, well adapted survivors. Here.

~100 different rebloom seedlings this fall, ~40 'early'.  I haven't 
gone
through yet to see how many of which ones have dry summer/zone
8/9/sporadic elsewhere rebloom genes & how many are strictly from "cold
hardy" bloodlines.

Linda Mann east TN USA zone 7b

---------------------------------------------------------------------
To sign-off this list, send email to m*@hort.net with the
message text UNSUBSCRIBE IRIS





---------------------------------------------------------------------
To sign-off this list, send email to m*@hort.net with the
message text UNSUBSCRIBE IRIS