Re: CULT:Mosiac Virus


> > >
> >    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?  

    Dallas Patterson wrote:

> 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>>

  If the color pattern is fixed w or w/o viruses, why worry?

  Is ti mosaic virus that causes the markings in the above cultivars?

>. These viruses make the organism ill, just
> as people are made ill by the influenza viruses. 

    The above cultivars I mentioned are not ill.  They have been
around for years and need no pampering.


> 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." 
> 
  I have seen light and dark green mottling only on a few Louisiana iris leaves not on 
the same cultivar and not every year.  It doesn't seem to spread to the entire patch.
I have never seen  any mosaic virus in the flower of any LAs.

> 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.
  
   I spoke of the tobacco juice in jest, but the replies have brought
up interesting information, though I am not convinced the flecking
in the blooms is any kind of virus.


  Walter Moores
  Enid Lake, MS USA 7/8




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