SPEC: I. germanica
- Subject: SPEC: I. germanica
- From: S* M* <7*@compuserve.com>
- Date: Tue, 9 Feb 1999 23:08:05 -0500
- Content-Disposition: inline
From: Sharon McAllister <73372.1745@compuserve.com>
Here's an example of tracing important breeders back to their origins.
BLACK FOREST was a key contributor to the gene pool of modern blacks, so
there was incentive to trace its origin. It came from ETHIOP QUEEN X
DYMIA. I did not find chromosome counts for either of them, and found
nothing eye-catching in the background of ETHIOP QUEEN except the
ubiquitous BLACK PRINCE. [Lots in the lists' archives on that one....]
DYMIA, however, is another matter. It was from HARMONY X CRUSADER and
Randolph counted it as having 46 chromosomes. I found no count for
CRUSADER, but it came from I. cypriana. I found neither pedigree nor
chromosome count for HARMONY, but it was classified as an IB in the '39 CL
-- which was the code used for I. germanica hybrids. Offspring of a cross
between a 44-chromosome germanica amphidiploid or amphidiploidlike hybrid
and a 48-chromosome tetraploid normally have 46 chromosomes.
Of course this doesn't prove that BLACK FOREST had a germanica grandparent
-- it's just my best theory as to its origin. Proof would require not just
a chromosome count but an assessment of chromosome morphology and detection
of the presence of some germanica marker.
Most of the examples I found of possible contributions of I. germanica or
GERMANICA to the modern gene pool are of this type. If the reasons aren't
obvious, don't worry -- this is something like coming in on the second act
of a play. It should make more sense after we've backtracked to cover the
foundation species and looked at some of the proven paths through the
tetraploid conversion.
Sharon McAllister
73372.1745@compuserve.com
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