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Re: Aroid breeding problems

  • Subject: Re: Aroid breeding problems
  • From: "mossytrail" <mossytrail@hctc.com>
  • Date: Tue, 06 Jan 2009 16:12:26 -0800

> It isn't that uncommon in other families for self fertile
> plants to reject foreign pollen - not very smart from the
> point of vies of maintaining diversity, but plants are not
> really noted for their long-range planning.
Actually, it is smart for maintaining diversity.  If an
aroid accepted pollen from every congeneric species, pretty
soon the genus would have just one species -- not very
diverse.  Species maintain their identities by rejecting the
pollen of other species.  Diversity within species is
instead maintained by sharing pollen among different
genotypes of the same species.

Where a species DOES accept pollen from another species,
this can actually put its survival in danger.  In the
April-June 2008 issue of _Madrono_ there is an article about
this: a rare, endemic evening primrose, already endangered,
is now further threatened by an escaped garden species --
they are hybridizing, and the endemic is thus at risk of
losing its identity.  Unless the hybridization can be
stopped, the two species will soon become one -- a reduction
in diversity.

Some genera have different species with different chromosome
numbers.  If that is true in your case, you may not be able
to get around the barrier.

Jason Hernandez
Aroid-L mailing list

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