nodule

[Pankaj Jaiswal]

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=9100377
Mol Plant Microbe Interact. 1997 Apr;10(3):316-25.


http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=9620265
Plant Mol Biol. 1998 May;37(1):67-76.

I am not an expert either, but the above references  are suggesting that 
  the  so called "stem nodules" are developing from the dormant 
adventitious root primordia. Second one is even calling them 
adventitious root nodules. Therefore taking clues from Sue's  question, 
I would say that both are "root nodules" one is a generic one present 
only on the roots which can cite their lineage presumably to the
"basal cell" developing from zygote and other one, "adventitious root 
nodule" has a lineage from "apical cell" developing from zygote.

Jeff can comment on this. My suggestion is as follows
i = instance
p = part of
Read the structure bottom up.

#1
root
--p--root nodule
--i--adventitious root
----p--adventitious root nodule (synonym: stem nodule)

Basal and apical cell lineage will also question the placement of 
adventitious roots under "root"

-Pankaj

Katica Ilic wrote:

> It seems there is. I am not an expert, here is what I found about
> Sebastania:
> 
> Sesbania rostrata is a native legume of West Africa. It forms a symbiotic
> relationship with Azorhizobium caulinodans and is renowned for it's stem
> nodulation. Both stem and root nodules fix nitrogen however root nodules
> form at the curled root hair while stem nodules occur at the sites of
> adventitious root primordia via "crack" entry. The stem nodules unlike the
> root nodules contain functioning chloroplasts in the nodule cortex and are
> therefore capable of carbon fixation.
> 
> http://www.personal.dundee.ac.uk/~rparsons/sesbania.htm