RE: CULT:Sports--anyone?
- To: "'i*@onelist.com'"
- Subject: RE: [iris-talk]CULT:Sports--anyone?
- From: M* M*
- Date: Tue, 28 Mar 2000 14:33:12 -0500
From: "Mark, Maureen" <markm@tc.gc.ca>
I'd forgotten about somatic mutations and I can't remember anything about
them.
Would variegated foliage be an example of sports reverting? There are some
cultivars where you get occasional daughter rhizomes that revert to plain
foliage.
Maureen Mark
Ottawa, Ontario, Canada (zone 4)
> From: "Jan Clark" <janclarx@hotmail.com>
>
> The problem with your argument is that the mutation is not in the genetic
> material of the plant. It is a SOMATIC mutation, not a mutation of the DNA
>
> strands. While I can't quote scientific papers off the top of my head, I
> am
> fairly sure this is correct.
> The DNA remains unchanged, the genetic potential is exactly that of the
> plant bearing the sport. Something happens to alter the expression of the
> DNA, at a cellular level. For purposes of breeding, there should be no
> difference genetically between an iris, and it's sport, except the obvious
> -
> the germ cell from any iris usually only contains 1/2 of the parental DNA,
>
> which will have an enormous number of possible permutations and
> combinations.
> I wonder if anyone can quote any instances where a sport has reverted back
>
> (or sported to) the original variety?
> Cheers, Jan Clark, Australia
> ______________________________________________________
>
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