terms for roots

[Mary (Polacco) Schaeffer]

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, I¹m 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://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/
> 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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