terms for roots

[Vincent, Leszek]

Marty, Mary & others - The more I also try & gain clarity on the
origin(s) of seminal roots - from the scutellar node or above the
scutellar node, the more I need to see some images of longitudinal
sections through the germinating kernel so as to really see where these
seminal roots arise. The external morphology images & drawings just
don't provide enough granularity for me. The work by Hochholdinger et
al. (http://aob.oxfordjournals.org/cgi/content/full/93/4/359#SEC3)
provides some persuasive DESCRIPTION of the embryonic origin of seminal
roots which align with Marty's comments about the origin being from
within the scutellar node region - although the exsertion/emergence of
the seminal roots from the kernel tissue make the seminal roots seem to
appear from above the scutellum - the origin & emergence sites not being
spatially equivalent.

 

I'd suggest the needed tweaking should be "------ is a root emerging
from the scutellar node". This implies that Kiesselbach's description
((... just above the scutellar node." p.17) is a little 'off' but I
sense that his description is focusing more on the apparent emergence of
the seminal root than the origin.

 

- Leszek

*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
P. Leszek D. Vincent Ph.D., FLS
Division of Plant Sciences
215 Curtis Hall
University of Missouri-Columbia
Columbia
MO 65211-7020
USA
Ph: (573) 884-3716; Skype VoIP: phytosynergy; Fax:(573) 884-7850;
Email: Leszek at missouri.edu
Associate Curator, Dunn-Palmer Herbarium (UMO);
Research Associate, Missouri Botanical Garden (MO), USA;
Plant Systematist on The Plant Ontology Consortium - NSF award 0321666
(www.plantontology.org)
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*

________________________________

From: owner-po-dev at plantontology.org
[mailto:owner-po-dev at plantontology.org] On Behalf Of Marty Sachs
Sent: Monday, June 19, 2006 1:49 PM
To: Schaeffer, Mary L.; POC-dev
Subject: Re: terms for roots

 

Mary,

 

About the best I could find is in; Kiesselbach TA (1949) The Structure
and Reproduction of Corn. Nebr Agric Exp Stn Ann Rep 161:1-96

 

http://www.maizegdb.org/cgi-bin/displayrefrecord.cgi?id=59445

 

I'm attaching Figure 6 (page 14).

 

The seminal (secondary) root here is also growing upwards, but clearly
emerging from the scultellar node (embryo axis).

 

On page 16-17 in a description of the root system, it says: "The root
system of corn, as of other grasses, consists of two sets of roots: (1)
seminal roots whose initials are present in the embryo, and (2)
adventitious roots, which arise from stem tissue after germination...."

 

 

        -Marty

 

 

At 1:17 PM -0500 6/19/06, Mary (Polacco) Schaeffer wrote:

	Marty,
	That was my concern but since there seems to be some dispute
here amongst my betters:
	Do you have a picture or published reference I could go to for
this?
	 m
	
	
	From: Marty Sachs <msachs at uiuc.edu>
	Date: Mon, 19 Jun 2006 13:12:45 -0500
	To: "Mary (Polacco) Schaeffer" <SchaefferM at missouri.edu>,
POC-dev <po-dev at plantontology.org>
	Subject: Re: terms for roots
	...
	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).

 

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