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<FONT FACE="Verdana"><SPAN STYLE='font-size:12.0px'>Marty,<BR>
Here is the photo I sent earlier to Toby and PO-DEV – not sure if it made it to you, where an embryonic root is emerging from the embryo, above the scutellar node. Me, I’m no morphology expert, but I did check with my betters (Leszek, Ed Coe) before bringing this up.<BR>
<BR>
Image was from Hund et al TAG 109:618-629 (2004) _ root architecture QTL paper<BR>
<BR>
It fits with Kiesselbach description, p. 17<BR>
[in maize there is a class of lateral seminal roots in maize that come off the main 'stem':]<BR>
"at the base of the first internode of the stem, just above the scutellar node" (Kiesselbach p.17). <BR>
<BR>
mary<BR>
<BR>
<BR>
<HR ALIGN=CENTER SIZE="3" WIDTH="95%"><B>From: </B>Marty Sachs <msachs@uiuc.edu><BR>
<B>Reply-To: </B>po-dev@plantontology.org, Marty Sachs <msachs@uiuc.edu><BR>
<B>Date: </B>Mon, 19 Jun 2006 11:57:15 -0500<BR>
<B>To: </B>po-dev@plantontology.org, kellogge <kellogge@msx.umsl.edu><BR>
<B>Subject: </B>Re: terms for roots<BR>
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Toby,<BR>
<BR>
This looks fine to me except for:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Verdana"><SPAN STYLE='font-size:12.0px'>embryonic root<BR>
---is-a primary root<BR>
---is-a embryonic nodal root<BR>
------is-a seminal root<BR>
------is-a root from node<FONT COLOR="#FF0000"><B> above</B></FONT> scutellum<BR>
</SPAN></FONT></BLOCKQUOTE><FONT FACE="Verdana"><SPAN STYLE='font-size:12.0px'><BR>
These roots which are also called 'secondary roots' or 'lateral seminal roots' are actually from the scutellar node, not from a node above the scutellum.<BR>
<BR>
See: <a href="http://aob.oxfordjournals.org/cgi/content/full/93/4/359/MCH056F1">http://aob.oxfordjournals.org/cgi/content/full/93/4/359/MCH056F1</a><BR>
<BR>
<a href="http://maize.agron.iastate.edu/images/corn/fig1.gif">http://maize.agron.iastate.edu/images/corn/fig1.gif</a><BR>
<BR>
The crown (a.k.a, nodal) roots are the first ones that form above the scutellem.<BR>
<BR>
-Marty<BR>
<BR>
At 11:12 AM -0500 6/19/06, kellogge wrote:<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Verdana"><SPAN STYLE='font-size:12.0px'>Hi folks -<BR>
Mary and I have had a discussion about terms for roots in maize, which has led to the suggestion of the following terms:<BR>
<BR>
Under each type of root, she has requested terms defining the central axis and also the lateral root.<BR>
An example for crown root is:<BR>
crown root<BR>
---part-of central axis of crown root<BR>
---part-of lateral root from crown root<BR>
<BR>
She has also run into the problem that grass embryos are well enough differentiated to have multiple nodes, such "nodal root" can apply within the embryo as well as on the germinated plant.<BR>
Here's a proposed solution:<BR>
embryonic root<BR>
---is-a primary root<BR>
---is-a embryonic nodal root<BR>
------is-a seminal root<BR>
------is-a root from node above scutellum<BR>
<BR>
shoot-borne root<BR>
---is-a nodal root<BR>
------is-a embryonic nodal root<BR>
---------is-a seminal root<BR>
---------is-a root from node above scutellum<BR>
------is-a prop root<BR>
------is-a crown root<BR>
<BR>
Toby<BR>
<BR>
Elizabeth A. Kellogg<BR>
E. Desmond Lee and Family Professor of Botanical Studies<BR>
Department of Biology<BR>
University of Missouri-St. Louis<BR>
St. Louis, MO 63121<BR>
Tel: 314-516-6217; FAX: 314-516-6233<BR>
<a href="http://www.umsl.edu/services/kellogg/">http://www.umsl.edu/services/kellogg/</a><BR>
This message is for the designated recipient(s) only and may contain privileged or confidential information. If you received it in error, please notify the sender immediately and delete the original. Thank you.<BR>
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