Re: Re Triploids
- To: Multiple recipients of list <i*@rt66.com>
- Subject: Re: Re Triploids
- From: E* G* <e*@moose.ncia.net>
- Date: Thu, 6 Mar 1997 17:29:41 -0700 (MST)
Tom L. wrote:
>Incidentally, IBs are not triploids but rather unbalanced tetraploids. They
>have three sets of TB chromosomes and one set of pumila chromosomes. The
>latter causes trouble during meiosis and causes the fertility problem. As
>you mention, IBs do show some fertility, a phenomenon that seems to be
>increasingly common in recent decades. This is useful, for example, in
>trying to transfer a particular IB trait into SDB or TB lines. But we still
>can't effectively line breed IBs by crossing IB x IB and selecting the best
>seedlings.
Ada Godfrey of Hermit Medlars Walk gardens, lists 45 IBs in their
'97 catalog and has indicated the ones that are fertile. There are
only 11 out of 45. Is this about average for IBs?
If two IBs are fertile, couldn't they be used for hybridizing? Tom's
last sentence in the quoted paragraph I took as a general statement
since most IBs are sterile.
Cheers,
Ellen - very cold and blizzard conditions - 18" of new snow today.
We have to wait for our daffodil weather - but catalogs
galore here :-))
--------------------------------------------------------------------------------
Ellen Gallagher "Summer gardens bloom glorious
e_galla@moose.ncia.net in winter dreams."
Coos County, New Hampshire, USA
Zone 3, AIS Region 1
