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nafex - Re: [NAFEX] It doesn't take a genus to see that there must be some relationship...

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  • From: rob hamilton <lostman_amiga@yahoo.com>
  • To: North American Fruit Explorers <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] It doesn't take a genus to see that there must be some relationship...
  • Date: Thu, 17 Feb 2005 07:03:41 -0800 (PST)

Fascinating!

Now is this different than what is usually termed as a
"sport"?
Which I assumed was an actual change in the genetic
material or in the way it is expressed.

rob

--- lee reich <lreich@hvc.rr.com> wrote:

> The growing tips of plants are made up of two or
> three layers, any one
> of which might be genetically different from the
> other or have part of
> it genetically different than the rest. As these
> cells divide, they
> continuously make new cells that make up the new
> plant. In a graft
> hybrid, or even a naturally occurring chimera, then,
> each cell is not a
> combination of two different genetic individuals,
> but different parts
> of a leaf, fruit, flower, or stem are made up of
> genetically different
> cells. Just where these different cells are located
> on the plant
> depends on where the cell lies in the meristem, or
> growing point.
> Chimeras are not that uncommon; they're just not
> noticed unless the the
> two genes express themselves differently visually,
> one without
> chlorophyll, for instance.
>
> Lee Reich
> www.leereich.com
>
>
> On Feb 17, 2005, at 8:10 AM, rob hamilton wrote:
>
> > I am still a little puzzled by this. The genetic
> > material does not combine, but the resulting plant
> > contains the genetics of both material as in two
> sets
> > of chromosomes? So does the plant flip-flop in its
> > characteristic or I guess they call Phenotype. But
> > there no true combination of the charicteristics
> of
> > the plant. (ie. you would not have in a Pyrus and
> > Mespilus Chimeras with Medlar looking fruit that
> would
> > not have to be bletted and tasted pear-like)?
> >
> > If they did combine as such would these plants be
> > sterile?
> >
> > Rob
> >
> > --- lee reich <lreich@hvc.rr.com> wrote:
> >
> >> Actually, in a graft hybrid, the cells do not
> fuse.
> >> These "hybrids", or
> >> chimeras, as they are also called, arise when
> >> adventitious buds at the
> >> graft union grow so that the resulting shoot
> >> combines the characters of
> >> both individuals. Two, genetically different
> cells
> >> make up the
> >> meristem, or growing point. Chimeras,
> incidentally,
> >> are one possible
> >> explanation for the anomalies in males and
> >> femaleness of che trees.
> >>
> >> Lee Reich
> >> www.leereich.com
> >>
> >>
> >> On Feb 17, 2005, at 12:28 AM, Lon Rombough wrote:
> >>
> >>> There is also a Pyrus x Cydonia, aka Pyronia,
> >> which is a "graft
> >>> hybrid" of pear and quince. The theory is that
> in
> >> very rare cases,
> >>> tissues of the stock and scion are in contact in
> >> such a way that cells
> >>> fuse to make a sort of physical (as opposed to
> >> sexual) hybrid of the
> >>> two species, AND the fused cells are in the
> right
> >> place to grow into a
> >>> shoot that shows the traits of both "parents".
> >> Apparently there were
> >>> serious research attempts to cause such hybrids
> to
> >> form these "graft
> >>> hybrids" by grafting plants, then cutting them
> off
> >> at the union in an
> >>> attempt to force hybrid shoots from the callus
> >> union.
> >>> I have the Crataegomespilus hybrid (or one
> such)
> >> and it does show
> >>> traits of both hawthorn and medlar.
> >>> -Lon Rombough
> >>> Grapes, writing, consulting, my book, The Grape
> >> Grower, at
> >>> http://www.bunchgrapes.com Winner of the Garden
> >> Writers Association
> >>> "Best Talent in Writing" award for 2003.
> >>> On Feb 16, 2005, at 6:02 PM, John Smith wrote:
> >>>
> >>> I was pondering Stephen Sadler's information and
> >>> looking some things up, when I discovered there
> is
> >>> apparently a +Crataegomespilus which is a hybrid
> >>> between hawthorn and a medlar that was created
> by
> >>> grafting, not hybrid created by a sexual cross.
> I
> >> had
> >>> no idea a graft could take on characteristics of
> >> both
> >>> parents... I always thought the scion would
> >> maintain
> >>> it's separate genetics, but I guess that's not
> >> always
> >>> the case. I wonder how common this
> >>>
> is?_______________________________________________
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=== message truncated ===


=====
--------------------------------------------
Zone 7a/b Atlanta, GA

Atlanta Fruits Club
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Southern Fruit Fellowship (SFF)
www.NAFEX.org/SFF
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