terms for roots

[Marty Sachs]

Mary,

It looks like it, but I'm guessing not.  I've seen this in some lines.

I found the image that I was looking for:

http://schnablelab.plantgenomics.iastate.edu/images/research/hypothesis/cornrootwild.html

I've looked at a lot of these roots in my day, and it is true that in 
some backgrounds, they tend to grow upwards and appear as if they're 
emerging above the scutellum.  However, they're really originating 
from within the scutellum (or the embryo axis proper).

	-Marty

At 1:01 PM -0500 6/19/06, Mary (Polacco) Schaeffer wrote:
>Marty,
>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.
>
>Image was from  Hund et al TAG 109:618-629 (2004) _ root 
>architecture QTL  paper
>
>It fits with Kiesselbach description,  p. 17
>[in maize there is a class of lateral seminal roots in maize that 
>come off the main 'stem':]
>"at the base of the first internode of the stem, just above the 
>scutellar node" (Kiesselbach p.17).
>
>  mary
>
>
>From: Marty Sachs <msachs at uiuc.edu>
>Reply-To: po-dev at plantontology.org, Marty Sachs <msachs at uiuc.edu>
>Date: Mon, 19 Jun 2006 11:57:15 -0500
>To: po-dev at plantontology.org, kellogge <kellogge at msx.umsl.edu>
>Subject: Re: terms for roots
>
>Toby,
>
>This looks fine to me except for:
>
>embryonic root
>---is-a primary root
>---is-a embryonic nodal root
>------is-a seminal root
>------is-a root from node above scutellum
>
>
>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.
>
>See: 
><http://aob.oxfordjournals.org/cgi/content/full/93/4/359/MCH056F1>http://aob.oxfordjournals.org/cgi/content/full/93/4/359/MCH056F1
>
><http://maize.agron.iastate.edu/images/corn/fig1.gif>http://maize.agron.iastate.edu/images/corn/fig1.gif
>
>The crown (a.k.a, nodal) roots are the first ones that form above 
>the scutellem.
>
>        -Marty
>
>At 11:12 AM -0500 6/19/06, kellogge wrote:
>
>Hi folks -
>   Mary and I have had a discussion about terms for roots in maize, 
>which has led to the suggestion of the following terms:
>
>Under each type of root, she has requested terms defining the 
>central axis and also the lateral root.
>An example for crown root is:
>crown root
>---part-of central axis of crown root
>---part-of lateral root from crown root
>
>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.
>Here's a proposed solution:
>embryonic root
>---is-a primary root
>---is-a embryonic nodal root
>------is-a seminal root
>------is-a root from node above scutellum
>
>shoot-borne root
>---is-a nodal root
>------is-a embryonic nodal root
>---------is-a seminal root
>---------is-a root from node above scutellum
>------is-a prop root
>------is-a crown root
>
>Toby
>
>Elizabeth A. Kellogg
>E. Desmond Lee and Family Professor of Botanical Studies
>Department of Biology
>University of Missouri-St. Louis
>St. Louis, MO 63121
>Tel: 314-516-6217; FAX: 314-516-6233
><http://www.umsl.edu/services/kellogg/>http://www.umsl.edu/services/kellogg/
>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.
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