HYB: aphylla germination
- To: i*@onelist.com
- Subject: HYB: aphylla germination
- From: "* O* <s*@hotmail.com>
- Date: Sat, 01 Aug 1998 04:34:19 PDT
From: "Sterling Okase" <sterling_o@hotmail.com>
Tom Tadford Little wrote:
>Be careful. I believe that Stephanie Markham and Vicki Craig were
talking
>about two different types of crosses. If you cross an
advanced-generation
>48-chromosome median (such as one of the Craigs' or one of Hagers) with
a
>TB, you should not have any reduction in germination rate. If you use
Iris
>aphylla itself instead, then you may expect some difficulties.
>
>Even when two species have the same number of chromosomes, they often
do
>not interbreed with quite the facility as members of the same species.
The
>modern TBs/BBs are essentially an artifical species. Iris aphylla,
although
>compatible, is still a different species. The modern 48-chromosome
medians
>are many generations away from aphylla; they are essentially part of
the TB
>"pseudo-species" now.
>
>Happy irising, Tom
Sterling (not Innerst) replies:
Ah!!! Now that was one of my questions. Yes, I was referring to the
aphylla hybrids of Hager and the Craigs. They are several generations
away from aphylla species so was thinking that germination should be
pretty good (like TB X TB crosses). But I was not sure because I am
relatively new to this aphylla thing and not quite sure how the 48 chr.
factor of aphylla affects a cross with tetraploid TBs.
By the way, I am thinking that aphylla is a 48 chr. diploid species (48
chr. occurring naturally) and TBs are tetraploid ( 24 chr. doubled). Am
I thinking correctly here? I can't find anything about this in World of
Iris. Not that I would understand the information if I found it in the
first place.
Anyway, thanks for the information....it means I cannot plant as many
crosses if I can expect good germination......Thanks all.
Iris Maniac,
Sterling (not Innerst)
Seattle, WA. Zone 8
AIS, KCIS, HIPS and MIS
sterling_o@hotmail.com
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