Re: HYB: color layers

I loved Robin's clear and concise description of cell layers and
location of pigment types.

As usual, nothing is as simple as I hope it will be.

I have been confused by the language used in describing pigments,
especially the concept of <layers>.

Originally, I thought <layers> was used as a way of describing the
concept of <stacking> various genetic traits.  In a discussion with an
offlist semi-lurker, it suddenly dawned on me that the <layers> might
actually refer to cell layers, or physical layering of pigments within
cells.  Turns out that it may be all three, or rather sometimes one or
two or three.

Here's what I think I've been told in offlist discussion.  Keep in mind
that this is a subject I am just learning about.   This post is just to
share what (I think) I've heard.

Apparently, not everybody goes along with the simple "3-cell layer"
idea.  Sometimes (?in some patterns), both types of pigments (sap
soluble and plastid pigments) seem to be in the same cells.

I'm not even sure whether or not there are always three layers.  In some
posts awhile back, Chuck Chapman or maybe Fred Kerr (?I think?) posted
some comments about pigmented cell layers on the reverse of the falls
extending or not extending all the way to the rim.  I don't know if that
means sometimes there are 4 layers or sometimes 2.

I'm told that the overlay of purple pigment on the falls of WABASH can
be scratched off.  It is white underneath.  Plastid pigments may also be
present in surface layers, but not necessarily in the structural
<middle> layers..  Pigments (all colors) on the rims of falls of
plicatas may be in all the layers, & can't be scratched off except for
pigmented veins (dotted or solid).

Which raises another question for me - where are the veins located in
the tissue?  Do the veins snake their way thru the other layers or are
they <in> the surface layer or ?

Apologies to the source if I've mangled any of the above.

Robin, these dumb machines don't always seem to interpret those <upper
case> non-alpha numeric (hex?  or hexed <g>) the same way from one
computer to the next.  I started using < > to indicate quote marks or
other forms of highlighting.  The lower case apostrophe may work.

No TT cat for me yet, darn it!

--
Linda Mann east Tennessee USA zone 7/8
East Tennessee Iris Society <http://www.korrnet.org/etis>
American Iris Society web site <http://www.irises.org>
talk archives: <http://www.hort.net/lists/iris-talk/>
photos archives: <http://www.hort.net/lists/iris-photos/>
online R&I <http://www.irisregister.com>

---------------------------------------------------------------------
To sign-off this list, send email to majordomo@hort.net with the
message text UNSUBSCRIBE IRIS
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index