Re: arilbred chromosome mysteries revealed (was: OGB+ in NY)
- Subject: Re: arilbred chromosome mysteries revealed (was: OGB+ in NY)
- From: t*@Lanl.GOV (Tom Tadfor Little)
- Date: Thu, 7 Mar 96 17:17:01 MST
Linda writes (regarding crossing TBs with tetraploid arils)
:
:has much of this type of hybridizing been done? if i understood all this,
:there can still be different chromosome numbers depending on what goes into
:the OG part, but if its half O (10x2) and half G (11x2) always, then you'd
:usually get the same number of chromosomes so they would be interfertile,
:supposedly, right? but i guess OG's are not necessarily or even usually?
: half and half.
This type of breeding is still in the early stages, since tetraploid
arils are a relatively new development. These new arilbreds are still
mostly in the hybridizers' gardens, but that will probably change over
the next decade or so.
Fertility doesn't depend on the chromosome numbers being exactly equal;
rather it depends on how well the chromosomes of each parent can
pair during cell division. The aril chromosomes, whether oncocyclus (10)
or regelia (11) pair pretty well, so it doesn't matter too much whether
the aril sets are oncocyclus, regelia, or a mixture.
The important thing is that crossing a tetraploid aril with a
tetraploid TB makes an arilbred with two aril sets and two TB sets,
which is a good combination for pairing and for fertility.
:
:what is an asi yearbook? for that matter, what is asi?
ASI stands for "Aril Society International". If you saved my
"INFO: Iris Societies" posting last week, you can learn more there.
(Or check out David Pane-Joyce's web page.) Otherwise I'd be happy
to send you more information. I edit the yearbook for ASI,
which is why I could speak authoritatively on what this year's
issue contains before it is mailed out. :)
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Tom Tadfor Little tlittle@lanl.gov -or- telp@Rt66.com
technical writer/editor Los Alamos National Laboratory
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Telperion Productions http://www.rt66.com/~telp/
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