Re: Iris pallida & plicata


Dave, 
I think we are referring to  pallida species in different ways. For
the origin of plicata genes research I need collected species samples
that are agreeded by experts as being I. pallida. Being found in a
garden,  even though they are primarily of pallida origin,  is not
sufficient for the test crosses necessary. The garden species could
have picked up a gene from another species anywhere along the line and
several generations of back crosses would leave the plant having a lot
of pallida characteristics yet it would not be genetically pure enough
for the necessary test cross. 


I. variagata have the stripes on the falls which is not recognized as
being plicata as it is not a narrow rim of feathering. At the same
time many cultivated bearded iris with stripes are recognized by most
as being plicata as they are from plicata parents. For example, Flea
Circus, Gnu Rayz, Circus Stripes, Autumn Circus etc. The spot pattern
in I. variagata is dominant and seemingly a homozygous trait as seen
in the  F1 from Thomas S. cross of Kupari X variagata where all
offspring seem to have  spot, seen as veins in central portion of the
falls. The next generation from F1 X F1  should have some plants
without the central portion having the spot pattern from variagata.
Thus I see variagata as being a plicata with the plcata pattern in the
spot (central area of falls) area as well as being in the rim. I have
done some research on this (rim versus central area pattern)and have
an article in preperation which will go to the Dwarf Iris Society
Newletter which shows that these are both plicata  patterns but the
only difference is the area in which the pattern is expressed.  Thus
the pallida is just a foil, used to remove the central spot as seen in
variagata and allows the plicata pattern to be on just the rim and not
the whole falls. A F2 cross of variagata X I. suavealens would likely
give us the traditional plicata pattern but I doubt the pallida X
suavealens cross would give us a plicata pattern. Any diploid (without
the spot pattern) that crosses with variagata would also do the same
if my premise is correct. 

Would producing the plicata pattern this way be convincing evidence of
the plicata gene originating with I. variagata ? 

Anyone who would like a pre publication copy of my article "What Can
MDBs tell us about plicatas " can request it from me  off list. 

Chuck Chapman 





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