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

Lon Rombough lonrom at hevanet.com
Wed Feb 16 20:52:15 EST 2005


Graft compatibility is one good indication of the relationship among 
"species".  Pyrus will graft on many species of Crataegus, on 
Amelanchier, on Cydonia, etc.  Not every variety of pear on every 
species of these genera, but I suspect many of these are more closely 
related than we give them credit.  If nothing else, look at the fruit - 
ALL these genera are pome fruits, with more or less the same internal 
structure.  That's certainly a very strong indicator of fairly recent 
(geologically speaking) common ancestry.
In the end, my own feeling is that many of the old indicators such as 
graft compatibility give a more accurate picture of how closely related 
these species are, until DNA testing says anything else.
-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 11:00 AM, Stephen Sadler wrote:

You're addressing a question I've long been curious about - what is the
relationship between genera Aronia, Pyrus, Sorbus, and Crataegus (and 
select
others)?  Aronia and Pyrus will graft; Pyrus and sorbus will cross; 
Aronia x
Prunifolia is classified in genera Crataegus, Mespilus, Photinia, and 
Pyrus,
depending on source; Crataegus, Sorbus, and Mespilus will cross...

I still await DNA testing for further definition.  As many of you know,
botanical species are classified by characteristics of the flowers, 
which
assumes a definitive correlation between genetics and floral
characteristics.  That assumption does often work out, but is not by any
means exact.  Fifteen years ago I was somewhat keeping track of efforts 
to
use genetic testing to reclassify plants.  The zoologists are certainly
making strides in genetic studies, but I haven't heard about botanical
reclassification in some time.

News and comments appreciated...

Stephen Sadler, Ph.D.
USDA 9, AHS heat zone 8,
Sacramento CA - Mediterranean climate


-----Original Message-----
From: nafex-bounces at lists.ibiblio.org
[mailto:nafex-bounces at lists.ibiblio.org] On Behalf Of rob hamilton
Sent: Wednesday, February 16, 2005 4:34 AM
To: North American Fruit Explorers
Subject: Re: [NAFEX] aronia rootstock

I has anyone else used Aronia as a rootstock for
anything else? What is it comapatable with?




--- Doreen Howard <gardendiva at charter.net> wrote:

> I talked with the people at One Green World today,
> when they called to
> confirm the shipping date of the dwarf Shipova I
> ordered.  I asked about the
> aronia rootstock and if it effected the precocity of
> the tree.  They said
> their experience is that Shipova on aronia bears
> fruit in 3-4 years.  The
> person I talked with said that has been the
> experience with their grafts at
> the nursery.   Does this sound reasonable to you
> experts, given that Shipova
> normally doesn't bear until the 7th year or later?
> Doreen Howard
>
>
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