Re: REB: HYB: rebloom breeding
iris@hort.net
  • Subject: Re: REB: HYB: rebloom breeding
  • From: C* C* <d*@rewrite.hort.net>
  • Date: Wed, 26 Nov 2014 14:15:59 -0500
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 <101l@rewrite.hort.net>
To: iris <iris@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

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