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Re: Line breeding vs hybridization

  • Subject: Re: Line breeding vs hybridization
  • From: magrysbo@shu.edu
  • Date: Thu, 21 Jun 2001 22:18:55 -0500 (CDT)

I know about line breeding in orchids. Example- Rhycholaelia (Brassavola)
digbyana with its hube fimbriated lip but narrow petals crossed with
standard Cattleya types imparts these features to their progeny. By
choosing those with better overall flower form but retaining the frilly lip
each generation of backcrossing to the standards, the form of
Brassocattleyas and Brassolaeliocattleyas can resemble the best standard
pure Cattleya with a lip not found in Cattleya in nature. Color can be bred
in from small insignificant flowers by choosing in each generation of
backcrossing/linebreeding an improved compromise between color and form and
discarding those with good color but poor form and size and also those with
good size and form but original color. Indeed green Bc.'s and Blc.'s with
great Cattleya shape and digbyana improved lip exist - and the heady citrus
fragrance of the distant digbyana ancestor comes through often.
Bonaventure Magrys

"Ron Iles" <roniles@eircom.net>@mobot.org on 06/21/2001 12:01:42 PM

Please respond to aroid-l@mobot.org

Sent by:  aroid-l@mobot.org

To:   Multiple recipients of list AROID-L <aroid-l@mobot.org>

Subject:  Re: Line breeding vs hybridization

Iza, Carol, Bonaventure & Friends

"Line Breeding" is another question which needs always to be addressed.
commonly involves inbreeding which limits gene pool diversity which is
obviated by intermittent distant outbreeding.  Within a species, in
domestication one can accept or not the moral responsibility to select most
carefully & sensitively parents and to outbreed to maximise genetic
diversity.   Previously, I only posed the question "Why hybridise?".

Symphysodon & its various "species" have been both hybridised and "line
bred".  There are now extreme gaudy" highly un-natural forms which Man has
"improved" and visually "perfected" but which Nature would probably have
extinguished in minutes.   Nature's nobility has been defiled.  Are you
advocating the breeding of "freaks" for your, their or Nature's sake?!!!
Finless bubble eyed goldfish cripples, guppies with banner tails which can
hardly swim, hairless indoor cats, and delicate dogs with extreme nasal
deformities, garish blooms free of the fragances of their ancestors, are
considered "desirable".  Obviously these are just a tiny few of the
of Man's arbitrary selection of what is "desirable" with little or no
respect for the natural objective viability, virility & legitimacy of
species....  By trying to "improve" on Nature, it has taken only a few
for Man to mangle & destroy what Nature has necessarily refined over
millions of years.

When Man as a species is line-bred for perceived excellence & is surrounded
only by the "nice" wild things and the ecologically & evolutionarily
disastrous, how will it be?   Because of their evolutionary diversity,
people vary in their ideals, objectives & their concepts of what is
desirable, both "good" & "bad".   One has to be cautious in breeding....

For every square foot on Earth there is room for EITHER what Nature has
miraculously refined since the mists of time or what Man has cleverly and
uncleverly mangled in a few "desiring", "improving" years.

There are fundamental ethics which relate to natural global integrity.  Why


----- Original Message -----
From: "Iza & Carol Goroff" <goroff@idcnet.com>
To: "Multiple recipients of list AROID-L" <aroid-l@mobot.org>
Sent: Thursday, June 21, 2001 4:25 AM
Subject: Line breeding vs hybridization

| My impression is that Symphysodon discus was "improved" by line breeding,
| hybridization. Line breeding is where one selects from a large population
| parents which bring the breeder towards the characteristics s/he finds
| desirable, continuing the selection for many generations. It is this
pursuit of
| "perfection" which has give rise to the domesticated dog, no longer quite
| wolf. This is commonly done with many kinds of plants, FCCs are given to
| outstanding ( by someone's definition) examples of a species. Of course,
| of dogs is nothing compared to a pack of wolves. Similarly our "improved"
| bred species are no longer as able to survive in the wild.
| Iza Goroff
| Whitewater Wisconsin USA
| Ron Iles wrote:
| > ...But one example dear to me is Symphysodon, "Discus", arguably the
"King" of
| > Aquarium Fishes.  Over less than three decades, the arbitrary & mostly
| > undocumented complex hybridisation of these supremely specialised
| > has produced the most extreme degradation of Nature's nobility &
| > biodiversity.   All for Man's sensationalism.

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