Re: CULT:Mosiac Virus
- Subject: Re: [iris-talk] CULT:Mosiac Virus
- From: D* P*
- Date: Mon, 10 Jun 2002 22:41:02 -0700
wmoores wrote:
>
> >
> > To see a photograph of Iris striping from a mosaic virus, visit:
> > <http://www.bcc.orst.edu/bpp/bot350/virus.html>
> >
> > Other plants which are reported to be insusceptible and suceptible
> > hosts for the mosaic viruses harmful to Iris are: Nicotiana, Freesia,
> > Chenopodium, Crocus, Iris, and Belamcanda.
> >
> > Dallas Patterson
> > nye@fidalgo.net
> >
> How do you tell the difference between mosaic virus and the
> striping , stippling or flecking in MING DYNASTY,
> HUMORESQUE, OFF BROADWAY, many arilbreds and some with
> broken color? Some people say that the marks seen on the
> cultivars I mentioned are the mosaic virus, but these cultivars
> persist and obviously don't infect other plants.
>
> Walter Moores
> Enid Lake, MS USA 7/8
>
Some viruses alter the genome of the Iris progeny, i.e. re-writes a
portion of the genetic code which governs the form and development of
the organism. Tulips, Iris, and many other plants have distinctive color
patterns as the consequence of such genetic alterations caused by
viruses. Once a plant is conceived with the altered genetic code,
genome, no further virus infection is required to produce the special
color pattern. The color pattern is fixed in the genetic code, with or
without the presence of any viruses.
The damage to be concerned about with infections of tobacco mosaic
virus, its synonyms, and closely related mosaic viruses is the basic
health of the infected plant/s, rather than any genetic changes in
themselves or their progeny. These viruses make the organism ill, just
as people are made ill by the influenza viruses. The virus causing the
illness in the plant probably will not change the genetic code of the
infected plant's progeny. It may or may not cause outward signs of
changes in color and color pattern, which are a useful clue to the
compromised health and vigor of the infected plant/s. The UC Pest
Management Guidelines describes the symptoms of the Mosaic (Iris virus
1) as "Light and dark green mottling and yellow stippling of foliage.
Mottling and stippling are especially prominent on young leaves. Mosaic
is most severe on bulbous iris and some rhizomatous species. Iris
germanica and its hybrids are only slightly stunted and sometimes
exhibit no symptoms...Oncocylus iris and their hybrids can be severely
damaged." See: FLORICULTURE AND ORNAMENTAL NURSERIES, Iris
(Rhizomatous), DISEASE CONTROL OUTLINES (Reviewed: 1/02, updated: 1/02),
UC Pest Management Guidelines, University of California Statewide
Integrated Pest Management Project.
<http://www.ipm.ucdavis.edu/PMG/r280112011.html>
A patch of Iris can serve as a disease pool for the mosaic virus, with
only a limited amount of damage to the more resistant types of Iris.
Yet, the introduction of less resistant Iris and other plants into the
same patch of resistant Iris or the transport of the infected and
resistant iris can result in severe damage to less resistant Iris and
other plants that are exposed to the diseased plants.
Exposing Iris to tobacco, Nicotiana plants, or infected bulbous and
rhizomatous plants is evidently a risky proposition from the standpoint
of disease control among Iris.
Dallas Patterson
nye@fidalgo.net
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