Re: Unusual Sport
- Subject: Re: Unusual Sport
- From: Bill Nash <email@example.com>
- Date: Mon, 30 Apr 2001 07:45:51 -0400
Jim et al ...this is coming to you from a simple dirt gardener, who is
not very well versed in scientific training. My complements,
are extended on your well thought out analogy pertaining to the cause
& effect probability of Pat Mora's hosta mutation.
*ONE wee'WILL'question! ..if I may?*
Do you suppose: this is a stable genetic factor; and thereby, the leaf
characteristics will be maintained? ../OR: due to this being an
unstable quirk of LI/LII arrangements therefore, the plant can revert to
it's former self in the next eye-cycle of growth?
ONE MORE question! ..Would leaf bud-cuttings be in order, to preserve the
"come on Sunshine"
aka .."Bill Nash Guelph Ontario Canada"
<<--- regarding original email below --->>
At 11:45 PM 04/29/2001 -0400, the Wizard of Awes (Jim Hawes);
Bill and other unusual sports,
The photo of Pat Mora's sport is indeed different. I have tried to come
up with some possible explanations for the unusual pattern of LI and LII
tissue. Let me start off the discussion of possible causes for the
variegation pattern with several assumptions which may affect the
analysis of the causes.
1. That the parent of 'Embroidery' (Aden) is Green Velveteen and not the
otherway around as stated in the HostaSports.com Library
2. That the ruffled edges of 'Embroidery' is due to the presumption that
it may be a 4-2-2 cytochimera which causes the ruffling in the green
outer edge. I suggested this in a talk given in 1997 Winter Scientific
Meeting in Chicago. This is speculation, please understand.
3. That the LI/LII tissue cytochimera may have been induced by radiation
by the originator. This also is pure speculation on my part, but may be a
4. That 'Embroidery' has been propagated widely by now. I know that two
labs have propagated it (Scolnick and Ventatesh in Florida for Khlem) and
perhaps Shady Oaks also. The more it is propagated, the more variable the
end product may become because of more chances for mutations of
5. That several mechanisms may have occurred within the plant tissue
undergoing micropropagation. These mechanisms must have occurred in an
exact sequence to give the specific pattern of variegation which has been
displayed in the photo. Some mutations may have occurred without being
observed in tissue culture.
6. That LI and LII layers remain distinct with 'Embroidery' while in
tissue culture with the exception that tissue displacement/replacement
may have occurred at one specific time while the cultivar was
With these assumptions being accepted, the following sequences of changes
may have occurred to explain the pattern of variegation observed in Pat
Mora's unusual sport:
Step 1. Green Velveteen may have undergone a chloroplast mutation which
created upon complete sorting out of unmutated and mutated plastids, a
periclinal sport with a green center and a white edge.
Step 2 . A tissue transfer took place with cell initials of LII
displacing the position of LI, and LI replacing the position of LII. The
chimera now has a green edge and a white center.
Step 3. A mutation creating a 4-2-2 cytochimaral sport may have been
created in a major cell initial in the unmutated green LII cell, creating
a green ruffled edge. The media portion of the leaf was unchanged, being
Step 4. After a number of years of micropropagation, a nuclear mutation
may have occurred changing the ability of one cell which happened to be a
cell initial in the apex of the meristem within the white LI tissue to
begin again to synthesize chlorophyll once more in a portion of the white
tissue layer. At the time of the photo, incomplete sorting out is
suggested as the current situation, since some of the tissue is
striated with alternating patterns of green and white tissue on some
leaves and a larger area of green LII cells on one of the
other leaves appearing, giving the LI layer, cells of two
different types, green and white.. . I would not be surprised to
see more green tissue next year with the white area of the
leaves being reduced in size in future years.
How is that for a diagnosis? Of course, other mechanism changes may have
occurred instead of those I have suggested. Aren't hosta wonderful? Just
about anything may have occurred.
Bill Meyer wrote:
Sports Fans, The picture
attached here was sent to hostapix by Pat Mora. It shows a division of
'Embroidery' in which a green center is appearing inside the whitish
center, which is something I've only seen before in 'Royal Tiara'. Given
that we understand Hosta to have only two layers, how can we explain
this? Has a third layer come into existance through mutation? Or is this
new tissue some L1 that has become trapped inside the L2? This is one of
the strangest things hostas do. The appearance of a third color in a
hosta leaf is not uncommon, but this usually occurs as streaking or
patches of another color. What does it tell us that it apparently can
form a stable-appearing