HYB: Purple Inhibitor

Sharlyn Rocha wrote:

:  My questions often involve the purple inhibitor gene ( I ).   When thi=
s
gene
:  is present in one or both parent, will it stop all purple pigments in
the
:  seedlings? =


It depends on the dosage.  The inhibitor itself is dominant, so it takes
only one dose to stop the purple pigment in a plant.  That plant, used as=
 a
parent, may or may not pass on the inhibitor gene.  That's why it's
possible to cross two dominant whites and get purple seedlings.

:  Blue and violet are listed together on Tom's gene color chart.
:  Does a blue parent produce blues?  Can you get a dark purple seedling
from a
:  blue or violet parent or do you need to cross with a dark purple paren=
t?

Tom was trying to make the chart as simple as possible and, personally, I=

think he did a GREAT job.  But now we're getting into some rather technic=
al
discussions.  There are a lot of different pigments in the anthocyanidin
group, which display varying shades of blue and purple.  There are also
co-pigments to take into account.  At this point, let me recommend readin=
g
TWOI chapters on pigments (Ch. 25) and genetics (Ch. 26) but one way to g=
et
a very dark iris is to combine as many of these various pigments as
possible in one flower.  =


And asked:

:   Is there a color chart for beard color?  Is there any way to
:  determine beard color?

Pigments work the same, whether the cells are in beards or petals.  Beard=

pattern is another matter.  In arilbreds, it's so complex that it has
resisted my attempts to chart it.  In TBs -- I don't know, but the "self"=

style beard seems to be the most sought-after and that ought to conform t=
o
the simple pigmentation chart.

Sharon McAllister
73372.1745@compuserve.com
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