North American Fruit Explorers mailing list at ibiblio

[Louis Pittman <lucky.pittman@murraystate.edu>]

Yah.
I can't speak to the dominance/recessiveness of inheritance of the heartnut
trait in a breeding population - like the polled trait(no horns) in cattle,
which is dominant to the horned trait. I presume that the heartnut mutation
may be dominant to the typical species nut shape and morphology, but I've
only grown out a handful of heartnut and Japanese walnut seedlings, and none
have produced nuts yet, so I can't even hazard a guess as to what shape the
nuts will be when they do.
But - some of the buartnut photos I've seen suggest a nut character somewhat
intermediate between that of butternut and heartnut, and some of the hybrids
look, for all intents and purposes, like butternuts, so my initial thought
that the heartnut shape might be dominant may be full of holes.

LLP

On Sun, May 1, 2011 at 3:57 PM, Dan Nave <nave1@comcast.net> wrote:

> OK, so it is when there is a mutation on a branch, for instance, of a tree
> where the fruit is
> different from the rest of the tree, and then this branch is taken and
> propagated by grafting
> presumably.  So it is a genetic mutation, but not due to sexual recombining
> or hybridization?
>
> Dan
>
> On 5/1/2011 2:35 PM, Louis Pittman wrote:
> > On Sun, May 1, 2011 at 2:00 PM, Dan Nave<nave1@comcast.net>  wrote:
> >
> >> What is a "budsport?"
> >>
> >> Dan,
> > A budsport is a genetic mutation which results in a different appearance.
> >
> > The heartnut, with its distinctive valentine heart-shaped nut, is a
> genetic
> > mutation of the Japanese walnut, Juglans ailantifolia.  To my eye,
> heartnut
> > &  Japanese walnut trees are essentially indistinguishable, but the nut
> of
> > the straight species looks very much like the typical butternut nut, if a
> > bit smaller.
> >
> > Budsports have been selected and propagated throughout history - for
> > instance, the various increasingly redder and more conical sports of the
> > original Hawkeye Delicious which have yielded the Red Delicious most
> folks
> > are accustomed to seeing (and avoiding due to its abhorrent taste) in the
> > grocery.
> > Big Red Gala, Scarlet Gala, Red Fuji, Perrine Giant Yellow Transparent
> > apples, red D'Anjou pears, the Converse Major pecan, etc., all are
> budsports
> > which were noticed by someone - the fruit was different(bigger, different
> > color, etc.) on that one branch, and it was selected for propagation.
> >
> > LLP
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