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Re: Hybridizing

  • Subject: Re: [IGSROBIN] Hybridizing
  • From: "Roth, Barry" <BRoth@BROBECK.COM>
  • Date: Mon, 22 Oct 2001 15:11:44 -0700

It is difficult to cross a diploid with a tetraploid because they have
different chromosome numbers.  A tetraploid variety has twice the number of
chromosomes of a diploid variety of the same species.  At fertilization,
those extra chromosomes of the tetraploid parent don't find their "mates"
from the other parent.

It is said that tetraploid P. x hortorum may sometimes generate a small
amount of diploid pollen and this may account for some past reports of
successful crossings between diploid and tetraploid varieties.  In several
years of hybridizing P. x hortorum, I was never able to make such a cross

Barry Roth

-----Original Message-----
From: Sandy Connerley [mailto:sandym@NORTHCOAST.COM]
Sent: Friday, October 19, 2001 8:11 PM
Subject: [IGSROBIN] Hybridizing

RE:  Pelargonium x hortorum

If you hybridize a diploid and a tetraploid, is it possible to get the
traits (like flower) of a tetraploid, but end up with a diploid (want it
for the small size - hoping for dwarf)?

Sandy Connerley
Eureka, CA

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