Re: Re: CULT:Sports--anyone?
From: "William Stone" <wstone@volcano.net>
----- Original Message -----
From: "Jeff and Carolyn Walters" <jcwalters@bridgernet.com>
To: <iris-talk@onelist.com>
Sent: Tuesday, March 28, 2000 3:07 AM
Subject: Re: [iris-talk] Re: CULT:Sports--anyone?
> Actually, the shrub rose known as AUSTRIAN COPPER is a sport of the
> naturally occurring species, Rosa foetida, which bears bright yellow,
> single flowers. Thus, when yellow flowers appear on AC, as they frequently
> do, it represents a reverse sport or back mutation to the wild type. I
have
> never seen an established AC on which this does not happen. It has occured
> several times on my AC in the fifteen years or more that I have been
> growing it.
Thank you for the correction of direction but I feel I have been fortunate
in that the AC ( red-orange ) hasn't thrown Sports of a whole branch yet. I
have had the plant about 5 years longer then yours but the early pruning etc
was done by snow load or pure necessity as it would reach out to far. Both
the yellow and the red-orange are grown more or less random or on thier own.
I have removed starts from each that remained true to parent but..... As
I say thank you Bill
wstone@volcano.net
Stone's Iris Garden
Volcano, CA
> In fact, as I have observed it, the reverse mutation to yellow flowers on
> AC rose bushes occurs, like most sports, with a gene change in a single
> cell at a growth point, such as in a newly emerging cane or in a new
branch
> growing on an existing cane. After the mutation has occurred, every cell
> resulting from further division of the mutated mother cell will carry a
> replicate of the mutated gene, and thus the whole branch or cane when it
> blooms will bear yellow flowers rather than red-orange ones. I think the
> wild type is more vigorous than the AUSTRIAN COPPER mutation, and thus, if
> the canes bearing yellow flowers are not pruned out the whole shrub will
> eventually appear to revert to the wild type Rosa foetida. This does not
> happen overnight, however. There are many AC roses in this area that
> continue to bear red flowers and yellow flowers on separate canes year
> after year.
>
> I believe a similar process occurs in irises that sport. Maureen
> hypothesized a series of gene changes as being responsible for a sport,
but
> in most cases it is probably just a single mutation in a single
replicating
> cell at a growth point in the plant that is proliferated as that cell and
> its descendants continue to divide.
>
> Jeff Walters in northern Utah (USDA Zone 4/5, Sunset Zone 2)
> jcwalters@bridgernet.com
>
>
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