hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
New Trillium species discovered

Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

RSS story archive

"Black" Iris

The discussion of "black" rebloomers reminded me of Dr. Peter Werckmeister's
genetic model.   He described the pigment as being concentrated in the
epidermis, with brown-black the result of a combination of intense violet cell
sap and yellow plastids in the cell wall.  It seems to me that there is also an
approach to black from the violet side that doesn't include the yellow.   I've
looked at enough TB petals under a magnifying glass to say this makes a lot of
sense -- but wonder if this model is still accepted or if there are exceptions
even in the TBs.  Has anyone done cross-sections to see whether the color is
really confined in this manner?

It is certainly a different story with the arilbreds.  The magnifying glass
reveals that the pigment is not confined to the epidermis, but is actually in
layers so that different colors are seen from different angles.  This means that
a fall may look like black onyx when viewed straight on but ruby-red when seen
from the side.  The top layer often looks like crystalline beads -- sometimes
colorless, sometimes golden, sometimes copper, sometimes violet.   Jet?  Well, I
can dream, can't I?  

This makes breeding for black arilbreds a REAL challenge.  What about other
types of iris?   

Sharon McAllister (73372.1745@compuserve.com)

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index