Re: HYB: aphylla germination
- To: i*@onelist.com
- Subject: Re: HYB: aphylla germination
- From: T* T* L* <t*@rt66.com>
- Date: Sun, 02 Aug 1998 12:34:19 -0600
From: Tom Tadfor Little <telp@rt66.com>
Sterling writes
>
>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?
It is a natural tetraploid, with four sets of 12 chromosomes each.
Tetraploids do occur in nature, although diploids are more common. Every
once in awhile, the natural process of cell division can malfunction,
producing a plant with twice the ordinary number of chromosomes. Many
natural tetraploids seem to come from long-ago natural hybrids between
diploid species. This is probably just a consequence of the fact that
diploid hybrids are usually sterile, whereas the tetraploid hybrids are
more likely to be fertile. Hence any tetraploids that are produced in the
hybrid population can out-reproduce their diploid competitors.
I don't know if anyone has proposed a theory of the origin of tetraploidy
in Iris aphylla.
Happy irising, Tom.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Tadfor Little telp@Rt66.com
Santa Fe, New Mexico, USA
Telperion Productions http://www.rt66.com/~telp/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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