Re: Re: HYB: long chill requirements?

 

Understanding the distribution of European plants always frustrates me. Often you're simply told which countries a species occurs in. Here's an actual range map for aphylla, showing the more northerly distribution in Russian Europe. I see some references say it occurs in "central Russia" which would extend the distribution much further north and east. I'm still not sure seeds from there would require 4 months of cold stratification.


So it sounds likeÂaphyllaÂwas used for hybridizing in the early 1900s. Is it thereforeÂlikely to be in the ancestry of most modern TBs, or just purples?

On Tue, Jan 20, 2015 at 6:35 AM, Chuck Chapman i*@aim.com [iris-species] <i*@yahoogroups.com> wrote:
Â

Aphylla has been in TB mix for quite some time. The dark purple and
black owe their colour to the anthocyanin vascular inclusions, which
by the clumping of anthocyanin in vacuole enable the dark colours.
The aphylla is the origin of this. They are distributed in wild in more
northern regions then variagata which can be quite far south.

Chuck Chapman

-----Original Message-----
From: Sean Zera z*@umich.edu [iris-species]
<i*@yahoogroups.com>
To: iris-species <i*@yahoogroups.com>
Sent: Mon, Jan 19, 2015 4:14 pm
Subject: Re: [iris-species] Re: HYB: long chill requirements?

Â
It's my understanding that aphyllaÂhas been used only relatively
recently in the creation of tetraploid MTBs, but wasn't used
historically for hybridizing in TBs and so wouldn't be in their
ancestry. TBs were mostly diploid hybrids involvingÂpallidaÂ(in its
various form) and variegata until they were crossed with multiple wild
tetraploid "germanica" types (whose taxonomy is still confusing). Since
the diploids had already been selected for taller plants with more and
larger flowers and a range of colors, crossing toÂaphyllaÂwould have
seemed a step backwards at the time.


Otherwise, since aphylla also occurs in central Europe, it experiences
the same winters as variegata.
I'm by no means an expert on the subject - hopefully others will weigh
in to correct any errors I've made!

Sean Z


On Mon, Jan 19, 2015 at 8:23 AM, Linda Mann l*@lock-net.com
[iris-species] <i*@yahoogroups.com> wrote:
Â
Thanks, Sean.

So you think I. variegata comes from a climate with more hours in that
32o - 45oF than other bearded species in the background of TBs?
Somehow, I got the idea that maybe aphylla or whatever was passing for
various other dwarf species that got mixed in the TB gene pool came
from
consistently cool climates.

It's probably just random 'luck' of gene combination, that has put
Immortality's seeds out on the far end of the distribution of chilling
requirements.

PS - I get <much> more uniform and faster germination of seeds in
the
fridge than outdoors, but that's probably mostly my wretched erratic
climate. Combined with the gene pool I insist on working with.

Linda Mann east TN USA zone 7















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