Re: JI/SI cross techniques

It's been my experience that there's no magic rule that makes irises
different from any other species. Though most of my wide crosses have
involved irises, I've found that the same rules apply whether the cross is
scabiosa, viola, veronica, or squash family.

While the number of chromsomes do seem to offer clues about the origins of
each species, this seems to have little bearing on whether or not a given
species cross will work. Fertile F1 hybrids are just as likely to occur when
the pod parent has a count lesser than the pod parent as when the pod parent
has the greater number of chromosomes. More important may be how much basic
genetic material the plants have in common and how much motivation each has
to cross with the other.

Christy

----- Original Message -----
From: "Robert Dickow" <dickow@uidaho.edu>

> What has always amused me, coming from many years of orchid growing as a
> hobby, is the view held by irisarians about chromosome numbers being so
> critical in breeding success. Maybe there is a magic rule for irises, but
it
> is no general rule about chromosome count matching or other rules in
> orchids, for example.




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