TB ancestry; hybridizing
- To: i*@Rt66.com
- Subject: TB ancestry; hybridizing
- From: t*@Lanl.GOV (Tom Tadfor Little)
- Date: Mon, 1 Apr 1996 09:54:33 -0700
Lonnie writes
:Speaking of rot. How
:well is the early breeding of beardes iris documented. From what I
:understand our modern iris are derived from iris germanica, a hybrid of
:unknown parentage. I. pallida, I variegata. etc. Are any of these
:unusually prone to rot? I have not seen any of the early hybrids or
:species. I was wondering if perhaps this unfortunate trait has been
:propagated a million times over, and not just environmental factors. Most
:moderns are tetraploids. That certainly cuts down the original parents
:doesnt it?
The modern TBs were derived by crossing the species you mention with
tetraploids from the eastern Mediterranean. These more tender species
are usually blamed for the rot susceptibility. (There was some discussion
of this on the list in February, you might like to review the archives.)
:Is it possible to cross 2N with 4N? What would you get?
: Nothing? Triploids......Sterile???
Yes to all three. ;)
The crosses are difficult; the scant seedlings produced are likely
to be sterile triploids, though an occasional tetraploid or semi-fertile
triploid may be produced.
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Tom Tadfor Little tlittle@lanl.gov -or- telp@Rt66.com
technical writer/editor Los Alamos National Laboratory
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Telperion Productions http://www.rt66.com/~telp/
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