Nodal root innstances (crown and seminal roots)

Tue May 3 12:58:13 EDT 2005

Hi Toby, Pankaj (& others),

It would seem essential that these terms be brought back. I provide the
detailed definitions for these terms from the Zea mays ontology. If
you'd like me to offer tweaked definitions for the definitions offered
by Toby, based on my Zea definitions, I could attempt those.

Crown roots - The crown roots are the predominant component of the
adventitious root system. They are termed crown roots because they
originate from the basal portion of the growing stem known as the crown.
The crown roots are subterranean in origin. The first crown roots (4-5),
arranged in a whorl, appear at the base of the second internode about as
soon as the tip of the coleoptile reaches the soil surface. A few of the
subsequent higher internodes may have a similar number of crown roots
(in whorls), after which the successive internodes have more and larger
crown roots. The crown roots are usually extensively branched, via the
production of numerous lateral adventitious roots. Note that the
adventitious roots which arise from 2-3 internodes immediately above the
soil surface (aerial in origin) are a separate component of the
adventitious root system, called 'prop' or 'brace roots'. (Feldman in
Freeling & Walbot (eds), 1994. The Maize Handbook, ID#60920;
Kiesselbach, ID#59445; Poethig in Sheridan, WF (ed), 1982. Maize for
Biological Research, ID#25744; Vincent, ID#165572, 2002)

Seminal root system - The seminal root system consists of the
adventitious lateral roots which are present in the ungerminated
caryopsis (kernel, seed) - they are formed during embryogenesis. The
adventitious seminal lateral roots arise from 3 to 7 seminal root
primordia. These primordia originate 30-40 days post-anthesis, and
emerge between the scutellum and the first internode. The adventitious
seminal lateral root system, the primary root and its associated
adventitious lateral roots, forms a small part of the total root system
of the plant. These roots are of greatest importance during the early
growth of the seedling before the adventitious crown roots of higher
internodes become well established. (Feldman in Freeling & Walbot (eds),
1994. The Maize Handbook, ID#60920; Kiesselbach, ID#59445; Poethig in
Sheridan, WF (ed), 1982. Maize for Biological Research, ID#25744;
Vincent ID#165572, 2002)

- Leszek

________________________________

From: owner-po-dev at brie4.cshl.org [mailto:owner-po-dev at brie4.cshl.org]
On Behalf Of kellogge
Sent: Tuesday, May 03, 2005 11:02 AM
To: Pankaj Jaiswal; po-dev at plantontology.org
Subject: Re: Nodal root innstances (crown and seminal roots)

Seems reasonable to me to bring these back. 

How about: 

crown root (definition): adventitious root initiating from one of the
earliest-formed nodes on the plant. (Comment: these roots are normally
formed at or just above ground level.) 

seminal root (definition): adventitious root initiating from the
scutellar node in a grass. 

Toby 

On Apr 27, 2005, at 12:40 PM, Pankaj Jaiswal wrote: 

<http://www.plantontology.org/amigo/go.cgi?view=details&show_association
s=terms&search_constraint=terms&depth=0&query=PO:0003005> 

	Can we bring back the two instances of the nodal root, 

	nodal root ; PO:0003005 

	---%crown root ; PO:0003008 

	---seminal root ; PO:0003009 

	These terms were merged to nodal root (PO:0003005) as synonyms.
They were introduced to the anatomy.ontology in version 1.11 

	Their development is genetically controlled 

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dop
t=Abstract&list_uids=14980975 

	Also I need these terms for annotating the genes expressed in
them 

	#1 

	cDNA-AFLP analysis of inducible gene expression in rice 

	seminal root tips under a water deficit 

	doi:10.1016/S0378-1119(03)00713-3 

	http://www.paper.edu.cn/scholar/download.jsp?file=wuping-5 

	#2 

	The Crown rootless1 Gene in Rice Is Essential for Crown Root
Formation and Is a Target of an AUXIN RESPONSE FACTOR in Auxin
Signaling. 

	Plant Cell. 2005 Apr 13 

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dop
t=Abstract&list_uids=15829602 

	-- 

	************************ 

	Pankaj Jaiswal, PhD 

	G15-Bradfield Hall 

	Dept. of Plant Breeding 

	Cornell University 

	Ithaca, NY-14853, USA 

	Tel: +1-607-255-3103 

	+1-607-255-4109 

	Fax: +1-607-255-6683 

	http://www.gramene.org 

	************************ 

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/divisions/artscience/biology/Kellogg/Kellogg/home.ht
ml 

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