Re: Re: HYB tectorum crosses

This stirred something in my mind.
I have read several places that the old diploid TBs, when crossed with the tetraploids from the east, gave lots of tetraploid hybrids.  This instead of the triploids one might have expected.
I wonder if the tetraploid TBs x diploid I. tectorum would give sooe tetraploid hybrids.
Walter

DFerguson@cabq.gov wrote:
A thought on how to make these crosses fertile.

I. tectorum is diploid. If you can get unreduced pollen or ovules from it,
you have in effect doubled the dose going into your hybrids. If you use a
tetraploid bearded Iris (or unreduced gametes from a diploid bearded Iris),
then you should get fertile hybrids with two doses from each parent. The
tetraploid compliment (two from each parent) should allow for normal
chromosome pairing and cell division during meiosis, resulting in fertile
gametes.

Unreduced gametes from the tectorum hybrids could in theory pair up too,
and make fertile offspring, but this is probably more difficult to
accomplish, especially if the tectorum hybrids are self incompatible
anyway.

Dave

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