For many situations in doing genetic tests, siblings are used in F2,
but must be so noted. On strict genetic testing, F2 means a self
cross with plants with both sexs on same plant. Particularly when
exploring a new or unknown gene from a wild population. There are many
reasons for this, but basically there are modifying genes,
interacting genes and you may be dealing with similar alleles.
Science can be picky, as you noted in more detail on use of 'clone' and
'cultivar'. Scientific definitions can be very different then general
usage.
Chuck Chapman
-----Original Message-----
From: 'JamieV.' jamievande@freenet.de [iris-species]
<iris-species@yahoogroups.com>
To: iris-species <iris-species@yahoogroups.com>
Sent: Thu, Feb 5, 2015 3:15 am
Subject: Re: [iris-species] naming irises
Moring, all,
The entire concept of cultivar is to designate a horticultural
form. A clone is a cultivar, but a cultivar may not be a clone.Â
Clone is more specific. Clones should receive specific names and
exacting parentage (as possible) to ID the clone, yet a cultivar,
such as a seed strain, has a list of characteristics which should
be met to call it that cultivar. Genetically we are
differentiating between the genotype and the phaenotype. Most
commercial Strain cultivars are F1 hybrids between specific
parentages (could be individual clones or established strains),
there are a few F2 versions as well (which, Chuck, are not
technically selfings, but must be siblings. The F does stand for
Filial and requires sisters/brothers and may even be a back-cross
to a parent, although this is generally noted, as we are talking a
stronger concentration of the gene pool. Line breeding. A selfing
is an F2, as well, but rareer as many plants, as we know, are not
self-fertile. The definition is pretty loose, as there is no need
to overly restrict the process. If one did, we would need many
more bits of nomenclature.)
In a practical sense, a strain is typically 80% or so true, while
a clone must be 100% true, baring mutations that may happen in
tissue propogation (we see a lot of this in orchids).
Registration is pretty straight foreward and done with the
registering body as designated by the main registry at Kew Gardens
(RHS). AIS is official for Iris, AHS is responsible for
Hemerocallis, etc. Both register only clones! As there are many
more registrations as truly useful plants, it is wise to consider
if a specific cultivar should be registered. And there is
generally a fee. I have personally registered a handful of Hems.,
but have yet to produce an Iris worthy of registration.
Hope this helps...
Jamie
Cologne, Germany
Am 05.02.2015 um 00:49 schrieb Chuck Chapman irischapman@aim.com
[iris-species]:
It is the difference between a seed line and a perennial. A perennial
is a 'one off' situation. Seed-line are a family with genetic
traits that are very similar, but still individual variations between
plants.
Along those lines, F2 is technically a self cross, not a cross of
siblings.
Chuck Chapman
-----Original Message-----
From: sdunkley1@bellsouth.net [iris-species]
<iris-species@yahoogroups.com>
To: iris-species <iris-species@yahoogroups.com>
Sent: Wed, Feb 4, 2015 6:41 pm
Subject: Re: [iris-species] naming irises
Help me on a technical point. The lecturing professor's assertion is
certainly one of those huh? moments that always come up in a good
discussion of cultivar. I have to assume the man is exquisitely
correct. Registering a cultivar with the AIS appears to the encouraged
protocol for introducing one's iris to the community. If one wants the
cultivar to remain genetically synonymous with a certain clone, how
might one go about this? For discussion's sake, how could it be done
strictly within the current protocol? If we need to discuss changes of
protocol, do that after exhausting the "no changes" options.
------------------------------------
Posted by: Chuck Chapman <irischapman@aim.com>
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